Model Yachting News: Issue 28 – March 1987

Editor: Chris Jackson 33 Yorke Gardens Mode l ReigatRH2e 9H Yachting Tel: (07372) 49365 News MARCH Welcome and to wait the first issue impatiently for This issue hope speed up production. will see Having successfully of 1987, some written better increasing use as weather of my PCW usual to as we test new typeface, a have 1987 snow everywhere, boats. facility which will I negotiated the’odd number year’, readers can settle bac k for FOUR more issues before they have to pay agai n!!! Thanks for your help!!! Thanks also to David Coode for the Labels, and all contributors without whom the magazine would not appear!!! GOOD SAILING COVER rule, Bow and stand boat size 1987 TO ALL MY READERS!! PHOTO. Bob De The IN of Bob Jensen, with their is planked the class. in Bob co-partners in the latest boat in balsa, with Pine De is Bow the formation of sunshine insert hatless, on of OLYMPIC-ONE-METER San Diego, planks, left. the See and U.S.A demonstrates inside MYN for the more handy info! SUBSCRIPTION QUERIES?? If any of your sailing friends see their copy, there is always the possibility of ask them to contact CRYSTAL PALACE 78 you me reading please. I this, think and complain I have run from the it error!! havent under got control but MARCH CRYSTAL NEW SUBSCRIPTIONS got they MARCH subscription rate for newcomers is: 1987 issue through to PALACE DECEMBER 7/8 1987. MARCH ‘The £7 post paid U.K. £8 post paid EUROPE £9 post paid ALL OTHER COUNTRIES I have stocks of ISSUES ALL PREVIOUS ISSUES 24-27, NOW OUT OF i.e. all 1986 issues in sets at £5.00 post paid. STOCK. Make cheques or Giro or money orders payable to Model OVERSEAS SUBSCRIBERS. this is impossible, Please remit cheques drawn on Yachting News, a bank with a please add 25% extra for bank charges. please. LONDON BRANCH. If Please note that the editor produces this macazine as a spare time occu pation. Telephone calle to talk about model yachts are always welc ome, but I am only at home in the evenings and weekende. (Sxeent when satling!) News In Brier CUP-RACER model 12M: Complete kits for this boat, with radio installed, 3 suits of sails, takes only two hours to finish, are available from the Editor, MYN. for total package, posted in polystyrene box, Peter Wiles, 1 the sailmaker, Courtney Rd., has moved Lower to a radio included, £129:00. new address; Parkstone, Poole, Dorset. tel: 0202-744101 MODEL RACING YACHTS: the Book by Priest and Lewis, a copy is for sale at £20 o.n.o. apply to S.Parker, 27 Hengistbury Rd., Southbourne, Bournemouth, BH6 4D0. May I, through your columns, express my grateful thanks and appreciation to all those model yachtsmen who, through their clubs, contributed so generously to the presentation made to me at the Annual General Meeting of the Model Yachting Association on the occasion of my retirement, after ten years, as Chairman. I was also most touched by the many messages of goodwill contained in the handsome book of photographs presented to me at the same time. I am glad that, having received the honour of being elected President, still be able to maintain close contact with the Association. I will Norman Hatfield. COMPUTER-AIDED DESIGN For some time now I have been hearing of efforts in several computers to assist the design of model racing yachts. Zatarian brothers form shape Quite separately the in Spain have developed an advanced system which not only gives but allows shadow profiles, countries to use mini- for whilst cambered decks and thickness of in the depths of the U.S.A. called FAIRLINE planking when giving Rod Carr has produced a package 1.5 which has been used to produce a one-meter class design from scratch. Space in this issue will not allow more detail, but I am happy to provide a photocopy of the Rod Carr information to seriously interested people in return for a small sum to cover budding computer the cost, orters, of and also pass on correspondence between any buffs! o have to The wife say £5.00, inform our readers of the death of one of modelyachting’s on Sunday @ February. NORMAN CURTIS, to whom we express our deepest could be found organising or sailing in most of Margaret the Woodspring and Guildford events, as well as District and National races. Our hobby relys on the dedication of its club and local its strength and we shall all sympathy, enthusiasts to maintain miss the enormous effort that Margaret put into the port. ADVERTISING Trade IN MYN. advertising towards our is always acceptable running costs!! Please to contact MYN, in return the editor to for a contribution discuss format and subscribers, and costs. Private adverts to sell all details I need is full second of hand the boats are items free for all IMIYRU chairman’s column RuvORT OF A MISTING The Chairman, OF FSeh alg? COM ITT lorman ilatfield, ie De sLONDON opened the meeting on welcomed all present, ON the 10th & first day 114h GARRY, 1987 at and 10.45 mei. esrecially the Union’s new President, Jen “sllin and Oliv ier Faucompre, who were attendinz for the first tine. sbsentees were John Gleave who wea competing in the 1.0.12 \Yorlds in Australia and ‘lorst Kronke who hed travel proble-s, Gateful thanks were expressed to Joim Slenve snd ‘hotortune” for the use of their comfortable new boardroom facilities. RIGIONAL CiasivIOs3 (a) R10r WORLDS = sweden, 1st/Sth susust, 1987. final notice should be in the hands of etional two per country, (>) RM SUROP AN – Holland, entry fee £50 allecated for return of initial date for entries total 30th ipril. applicatio Untry fee Reported – Ti YW/TavIGs thet the suggestion has been which could = West Berl in, proposed i:odel be more put ner country now Dfl levy 25). NAVIGA allocated 6 places. QLDS acceptable Clyrmics have to Jast that Wiest one poxtnoned and for a yeor. be chosen whieh would not Berlin. Ni. of entry alloceatior been suronean countries ijorld Chamrionship will be whether from Ii-YRU or NAVIG!. purpose Closing fees > (Vnion snother venue misht Certain decisions were made in resvonse to questions follows: For the places. 198s. jports to pa ae excluding banking to DV and NAVIGA involve travelling difficulties The winner of the 9 19th/25th July, 1987. Date : Jntries OG minimum by now. from hh, SurimArised ss | reeomnised competitors will be as ili world treated Cheipion, as members of orgenis‘ation. Entries minima entry forms two per country, should be dalance pro signed by an official rata. idered of both |)}\V devirable tnet 411 and NAVIOA, INYRU does not wish to include the R210r class) in the Championship weelr, It will | for the class wntil . | be sucgested to [AVIGA that they may wish to defer their own World entries from Hans Kukula, (a2) RE 1989, from ar’s. event. Sail azrreed to be iaoe Officer, | WORLDS – Las Palmas, 1990. Formal approval given to the issociacion ‘ispanola de Vel= lodelismo Javal, Los Guaires to host this event. (e) RY i/@ and the “ut WORLDS – U.u.A., 1992. Verbal application received on behalf of New York State. SOUTH Champion: when they mirnat consider recinrocatine by invitine IlYaU countries. be could then form ‘the basis for 210r Worlds every two years as Written apslication to host @ worlds in Yort awaited. APRICA CUF lio reply had been received from the PYA34 rdine the return of the troni:y to their safe keeping. sub committee with the YALA events. pondence trticles else be 2.1(iii) xirman and Vice received rman would, relating to siven to» and 7.16. the ing possible ban on in future, entries amendments to deal Ii *? to the Union’s 4 Total expens Union’s dues over co Consideration will Constitution, edt esident, of the s for the meeting arounted to account, includins U affiliation a balonce in the 1 There were no out«tanding 645 fees f of “585 for 1986, further stock of cloth badzes will vstria wv formelly elected purchased end weleond 1zec 2081 0va} + be 3 ad as soon as bs a | possible. of the Union. —noul MARBLSHSAD RULS REVISION The Vice-Chairman, Torvald Klem, had previously agreed to chair this item. The Chairman of the Technical Committee, Jan Dejmo, presented the new draft rule which had previously been circulated to all members of the Permanent Committee for consideration prior to the meeting. A very lengthy discussion followed during the last part of the first day and the first session of the second day. The following points emerged: The text of the draft was in line with the IYRU format, as originally agreed, and with the replies to the two questionnaires, Although it was clear what principles the member countries wish to see incorporated in the new rules. it was agreed that it was essential that the precise wording and drawings should be very carefully checked and agreed by the Technical Committee to ensure that no further queries or amendments would be required. The chief problem was sail measurement. The principle of cloth measurement had been agreed but it proved extremely difficult to reach agreement on precise cross-width limits which would allow the vast to use their existing sails without penalty or alteration and, amjority of owners at the same time, control the rule bending that has occurred with a minority. It was finally agreed that the draft was incomplete in some respects and required reference back to the Technical Committee. It was further azreed that sufficient time should be allowed to deal with the contentious points in the draft and a deadline for the production of the final draft was fixed for next July, when it is hoped that formal approval can be obtained from the Fermanent Committee at a meeting to be arranged at the Kuropean Championship in Holland, In any case, the new rules would not come into force until 1st JANUARY ‘!988. Meanwhile, it was agreed to metricate the existing rule and to amend the luff curvature rule 14(a) as follows: The luff curve shall be measured with the sails set on the spars. If they can be set on a straight mast or luff spar without any wrinkles appearing in the sail, the luff shall not be measured. If the spar has to be bent to set the sail without wrinkles, the luff curve so gained shall be measured in accordance with rule 14(b). 10 RATsR CLASS bwensvURAeN? Clarification of the correct interpretation of IMYRU 10r rule 3, 2nd paragraph, had been requested by intending builders so that they may proceed with preparations for this yerr’s Worlds. The query specifically relates to the “Splash” design by Graham Bantock (MY¥N Plan) but also, generally, to all 10 Raters with bustles. The Technical Committee’s decision that the “Splash” design breaches rule further agreed that: 1. 4ny yacht built to the “Splash” fjuthority before 1st March, 2. 1987, 3 was endorsed and it was design and measured by its appropriate National shall be allowed to compete in INYRU events. The Technical Committee will examine the existing class rule in the lisht of the decision, any amendments to be available in time for the next meeting of the P.C. in January, 1988. THE IMYRU ONS MapRa RULE It was reported that NAVIC’ had decided to drop the ‘X’ class and were considering replecins it with the American Olympic One Metre rule. The INYxU One Metre was virtually extinct end it had been suscested that it was time to consider taking sinilar action to replace it. ietre rule, in the rules the ‘.C. Having hed the opportunity to study the their views on a One Metre Class, simple He.C..12 lember countries will, the object however, be consulted on beine to ensure that any replacement give close racing at low cost and that the rule would be basically but would prohibit high cost and hi-tech developments, MaRS CLASS ASSOCIATION A sub-committee class rules, formed. One came to the speedy conclusion that there are too many loopholes to recommend adoption. would be populer, Olympic of the Technical heanwhile, Committee had been formed to revise it nad been proposed that a Class Association should be This would only be viable if the biggest user of the class, would agree the ©,C.12m to this move. Their agreement had not, ao the proposal was dropped. however, the American HYA, been forthcoming, therefore RACING RUL#S COMMITTEE The Chairman of this Committee, Roy Gardner, said that his Committee had been m@iven an opportunity to study the report submitted by Bryan Willis, Chairman of the Jury at the 1986 Worlds. Various suggestions have been made to amend the Racing Rules Appendix at the time of the 1988 review of the IYRU Rules. The President is still in the process of revising the IMYRU Policy and Directives document to include some of the suggestions from Bryan Willis. PUBLICITY The Publicity Officer, Chris Jackson, in giving his report, summarised the work he had done in promoting the IMYRU and Model Yachting in general through articles in his own quarterly and various other magazines. A letter had been received from New Zealand requesting, as a right, a report from IMYRU on the 1986 Worlds. The P.C. agreed that the Union cannot afford to produce such reports to member countries, especially as they would only duplicate what had already been published in MYN, which is the official IMYRU news medium. It was pointed out that, in accordance with IMYRU Regulations, the Union holds television rights over its World and Regional Championships and member countries hosting IMYRU events are requested to note this. INDIVIDUAL MEMBERSHIP Union Regulations, clause 6, encourages individual membership and the annual subscription has been fixed at £15.00. Initially, members will receive free copies of the Union’s Constitution, Regulations, RC Yacht Racing Rules and Fixture List. Throughout the year they will receive most notices and minutes of meetings normally sent to National Authorities. Additionally, members will receive free copies of Model Yachting News. They are not entitled to vote at IMYRU meetings. ENTRY ALLOCATION FOR CHAMPIONSHIPS The present system of allocating entries from member countries to IMYRU Championships had been criticised on the grounds that a single entry at a World Championship is severely disadvantaged. A minimum of 3 entries had been proposed but it was agreed that a better compromise would be to increase the minimum to 2 per country, the balance on the present pro-rata basis. This concluded all the main business of the meeting and members were able to leave on their long journeys home at 4.30 p.m. on the Sunday afternoon and just in time to miss the beginning of the severe winter weather. Norman D. Hatfield, Chairman, #42444 THE NEW M CLASS RULE ##8e# The final text for the new rule is certian to be ready by JULY 1987, Allowing for the time it needs to be published and circulated to all countries it would seem that the best date for its introduction will be 1 JANUARY 1988 At the same time Naviga need to place the new rule before their Praesidium and allow time for boats to be checked against it before the BERLIN Worldchampionship With the delays that occur it is understandable if people are getting concerned but the important decisions were made in the Questionnaire answers and the new rule *# ## *# #* will reflect these views; No changes in the appearance of the M class. No need to modify the hull or rigging of existing boats. New measurements to control sail size and shape, without putting the majority of existing sails out of nating!! New definitions to control Tunnel Hulls, odd shaped decks,and limit radio to stop the adoption of on-board computers. It is the last two items that are causing the holdup, it being a lot easier to know in your mind what you mean than to put it down SIMPLY on paper!!! Last but not least the new rule must be tested to try to ensure it has no builtin loopholes of its own. MODEL YACHT DESIGN An Article Sections in four BY GERHARD MENTGE The Author, Gerhard Mentges, was born in Essen in West Germany in 1955. He started model yachting in 1973 as a member of the Ship-Model-Club of Duisberg,with M class boats. Whilst studying Naval Architecture at Aachen University, he used the CAD facility on the computer there to assist in the design of his M and 10R. In 1984 he started work at AEG in Hamburg as a development engineer in the Dept of Hydrodynamics. He is chairman of the model section of Deutscher Segler Verband, married with and is one young child. THE ARTICLE HAS BEEN TRANSLATED FROM THE GERMAN AND CONTAINS SOME ODD PHRASES, FOR WHICH THE EDITOR IS RESPONSIBLE, NOT THE AUTHOR. TIME DID NOT ALLOW FOR A COLLOQUIAL REWRITE BUT THE SENSE REMAINS CLEAR,I HOPE. Part & In the following chapters I would like to address everyone fascinated by the enormous attraction for model yachting and having discovered the attraction or will do so in the near future. The difference in model yachting and “big” sailing lies mainly in that the enthusiast does not only sail a boat but at the same time he is also the designer, boat builder, sailmaker, sailor in ragattas etc. Over the last few years we have seen an enormous increase in the quality of regatta yachts and it is becoming more and more difficult to meet all the demands. When I was at the Aachen Technological University, studying naval architecture, | was also an building enthusiastic issue. experimental always be certain transfer we one the of extent for one should remember the to of model results this of process. formation) look I models is in the to fact separately at the to firstly, look for opportunity some to that of evaluate is only any yacht to a of trying so why can’t whereas conditions. in designs the and and to influence problems design the cannot only gravity aspects own various true size, current one’s the yachts practice important encouraging large This without influence at of original true in an objection that common the transferred like involved yachting. be would the It model can yacht, creating test very construction yachts reason for for and certainly raise the this a observations will for wave has readers sailor used reverse (i.e. Some model For design secondly to improve them. DESIGN FOR THEET TARG Even before considering the shape of the yacht one should consider the I am starting out from a model yacht with a purpose it is to serve. high speed which can be also be used for regattas. The usual regattas are held on triangular courses thus giving particular importance to the characteristics of the wind. One will find it very difficult on all other legs of the courses to catch up on the lead gained on the beat. The reaching and running characteristics should nevertheless be as favourable as possible. We will see at characteristics are actually inconsistent. a later It stage that is furthermore these two important that there is good manoeuvrability and that the course stability is as stable as possible. Last but not least one has to ensure that the yacht can be sailed in variable weather and with different wave conditions. -2- THE EFFECTS OF HULL AND SAILS ON THE PERFORMANCE One often and sails. of an sees extremely This “on wind variable co-ordination course” evaluations becomes and/or the most of the influence evident maximum in the obtainable of hull performance heading on the wind. First of all attacking force floating to the the moving x hull on of board direction. the the hull 8 angle i.e. of force F the angle of is moving angle of velocity of the geometrical of of ratios apparent wind”. this then being 28 improvement the in sail order at the constant to of the the the hull improvement as important as improving the in turn is surprise cutting sail yacht no the could this make would building concentration vast a overrate not the have far sail any more force F and the force is equal force B effecting in moving direction centre line “heading L/D which 3 is to for of in of hull approximately normal. with constant on the and sails quite the the yachts, for the An L/D wind to L/D ratio of the to be considerably on of keel ratios 5 heading heading at one wind larger which vertical keel in would fin is sail. the difference model the the angle improvement looking considering these on i.e. in is around 3 from would have in and keel, lie apparent whereas an lies wind obtainable wind hull D derived from Edmond Bruce, the apparent vertically vertical an just often the values, the measured wind and these approximate, very and in Taking ratio frequently and horizontal the the only sailors apparent important the sail speed result L/D ratios then Model will in apparent resulting even some Resistance yachts, improve an the flow of hull sail is model on L/D of L our degrees, achieve be L/D can 21 to 6. obtained approximately sail applies approximately is and shows water. correlation, The obtainable also degrees of hull of direction Diagram 2 shows L/D and At Sail This buoyancy The shown. 1. simplification, wind yacht. also of for direction moving R. diagram instance flow The R are to sail, each the a resistance is ana In direction. resistance hull and on direction measured to explanation position. flow hull an in that sails and the their 1mm virtually such evenly reason aerodynamic more or less unusable, catastrophic matched for this quality. on consequencies, sails lead This allowance whereas to more lies in a in the large In big intense hull. FORCES ON HULL AND SAILS Diagr| - 3- 7 RESISTANCE OF THE HULL, THE FROUDE SIMILARITY EQUATION The builder will find has been hulls of it however, common quite fixed at can be easy at the in the yacht this is very characteristic The Law of model can the for wave height. Froude for a yacht 10 M-boat class overall raters, formation designer is is length only mono- for 10 wave due raters, be equation for in and immediately. The Similarity similar conditions which is defined as = v n model are speed a full-size position of a means in other yacht. in similarity The that he equation non-dimensional of therefore for lot This gravity, respect M- confirm general sizes. represents in in an wind energy. to and lucky Law of rating inertia maximum For require variable the formations are Certain increase would of the speed). shipbuilding to however, with talking about boats same results Froude in (hull further are used the is, test connected waves we force wave also length and indicated by follows: gi v = speed g = acceleration due boat length of the waterline run A stern of F ls and m/s. similarity his of 1.4 compare which the the displacement Similarity from the code on directly to yachting resulting is order wave as for for or formula measurements and must therefore for bow i.e. in transfer the length approximately power, words, The purely additional simultaneous this respect Furthermore, waterline speed and/or in Marblehead- builder. obtainable Froude yachting least 127cm. sailed. by length reports model is determined by the stipulated This the in boat m/s to gravity and/or wave For example, the m/s speed of an M-yacht. = 9.81 m/s2 length in m Froude equation would be Fn = 0.4 for the mentioned 1.4 Diagram 3 In diagram including the 3 I keel diagram conditions have and for from towing much appreciated yachting tests sailor. Lupart, then as as well have only a which help We of the M-yacht total the by 3 Topp run only as in the I” the further Froude floating summer had which a chart of 82 all the I had built to the originates the German “Anja been modified hull However, and with wellknown of M-yacht position the is an equation. resistance first which of The who boats, “Kalamoun entered in Biisgen marked similarity to deliberately by course”, Mr. resistance unheeled conducted towed “Flipper” standardized to I the established “running a design shows a I rudder applies as entered by Mr. myself. very model XIV” by Biisgen, Flipper the Stollery March Hare design. resistance detailed chart tests are a qualitative necessary in and order to provide more exact records. Up to Fn = 0.1 we are dealing with frictional resistance only, thereafter the total resistance consists ot frictional and wave resistance, in this case created mainly by the stern wave, angle of apparent wind-arrd course sailed M-Yacht Resistance wave resis frictional resistancé a 0,2 0,3 0,4 07 105 wVinTMs Fn Af “ip. ratio. of hull. Gla uO Cols, 12 “ip- ratio of sail iT 16 esi LAI BIL REYNOLDS -Number-—Re 10 Gg = The equation quite of 0.35 speed by even however, a range takes statement decrease which a by the resistance and the The not = vertical wave maximum. of the a Fn the displacement planeing on caused be of However, is dealt The up to this a to rolling also are to the a degrees, increase at depends a to it This quite increase the planeing a is is good in wind, transition the total wrong, however, total resistance be called further vertical an increase induced great the will of the resistance resistance factors. stabilizer and this chapter rolling is resistance. creates an a Froude accordingly where total separate the the speed. the the to quickly. the only up achieve range rolling resistance 15 in to will drifting, in can that resistance with very Absolutely in mainly due hull considerable run There by the one i.e. given of resistance increase 0.5, run. account stabilizer. resistance but than sometimes resistance therefore that increase so much. is the rating give a considerable induced resistance will in hull wind percentage of the frictional The = constructing considering little from will in that practice not increase obtain larger place resistance to with will even shows possible confirmed In relatively 5 concerning increase angle of extent on 30 in the the degrees the shape hull. FRICTIONAL RESISTANCE L OF FLOW NICA TECHBASIS Contrary to the known conditions for the big yachts the frictional resistance of the model yachts is influenced to a great extent by two varying flow formulae, namely the laminar flow and the eddy motion. In laminar flow even very thin liquid layers can slide smoothly on top of one another. An impulse exchange between adjacent layers takes place in the eddy motion; this causes the thickness of this layer (thickness of boundary layer) to increase. The coefficient of friction also increases. This coefficient of friction is shown in the formula for the frictional resistance R : = coefficient of friction (F for the English friction) c thickness of water (102 kp s2) m4 = speed of the yacht in m vy s A s = wetted surface of the hull in m The coefficient of friction, as mentioned before, depends on the flow formula and also on the length of the hull, the speed as well as the roughness of the wetted surface. 13 -6- At this number point I would like being defined as to mention the influence of the Reynolds follows: v s Voy Re = = speed of 1 = length v = kinematic yacht in m/s id e805 of wetted area in m Vv -5 (vy = The me s 0,116×10 Reynolds mainly for number at is frictional like viscosity of the water 15 degrees C) the Froude flow processes. number The a similarity so-called equation critical but re-number, Re kr is the one where the change occurs from laminar to turbulent. Diagram 4 shows the coefficient of friction independantly from the Re On the hull of an M-boat (L=127cm) the change point (Re kr = number. 5×10 5) lies on the following lengths, measured from the bow of the boat to aft. (table 1). An M-boat hull has a laminar flow nearly all the time at low speed and at higher speed over a very large area of the hull as can be seen in the table. Unfortunately there is one further point to be taken into account and this can have a serious influence on the present ratios. The laminar boundary-layer represents a relatively low energy and therefore also sensitive structure which does not stick well to rounded Yet the laminar boundary-layer is stable to the areas like the hull. greatest possible extent in the area of drop in pressure (diagram 5). This applies to the hull from the bow to approximately the widest part and it is unstable in the area of increase of pressure i.e.from the widest part to aft. Because of this fact the laminar-turbulent change does occur even at very low speed at the maximum beam; this is shown in The builder is therefore obliged to place the maximum beam the table. as far back as possible. The factor of The quality of the surface is a further important point. the coefficient of friction cF of the Reynolds number as shown in A surface diagram 4 only applies to a “hydraulically smooth hull”. which is termed as hydraulically smooth is a surface which feels absolutely smooth when touched with the fingertips, This certainly includes any polished area and those areas ground wet with emery paper Care must be taken that the bow area and especially the No. 400, I would like to add the leading edge of the keel fin are not damaged. following theory for the wet ground hulls, in that water particals will stick better to the ground surface and thereafter only friction of the This theory, however, applies to more than water layers will occur. ground hulls only. It is therefore incorrect to use this as an advantage point for the ground outer skin. Preference must be given to the absolute are no smooth surface, scientific tests on i.e. the hand for polished surface any difference as so in far there (hydraulical) smooth surfaces, And here a brief remark on polymers because we all know that they decrease the frictional resistance. This they can, but only in the turbulent boundary-layer. In the laminar 12 layer, which covers the largest -7- part of the hull, they stay completely ineffective. Because of the relatively small amount of turbulent boundary layer | think it is no use to apply this to model A further illustrated yachting. important problem is the socalled pressure drag, as in diagram 5, it is caused by the accelerator stall in the stern area. It causes the total resistance to increase considerably and in the end it can only be positively influenced by respective molding in the stern area of the hull. More about this in the chapter on “lines”. biagrg BOUNDARY LAYER DECREASE OF INCREASE PRESSURE | OF TRANSITION pofNt POINT OF SEPARATION TURBULENT ! LAMINAR PRESSURE DEAD. NOT THE 1987 RULE CHANGE – As THE EXECUTIVE BOARD oF CONTINUE ITS FENCE SITTING MARATHON,THE BANTOCK STOCK MARBLEHEAD SAILS DESCRIBED BEEN CHANGES TO AIR IMYRU DECIDED To THE PROFILE SHAPE OF IN THE 1987 PRICE LIST HAVE NOT _MADE. THE PROFILE OF THE FOOT ROACH REMAINS SIMILAR TO_THE 1986 sHaPe. IT NOT ESSENTIAL, THEREFORE, TO USE GOOSENECKS 8-9 oR 10 WITH STOCK SAILS, IS M CLASS STOCK SAILS – ALL_THE SIZES INDICATED ON PAGE 7 OF THE ‘8/ PRICE LIST ARE AVAILABLE. THE 1850 sUITS ARE AVAILABLE IN LIGHTWEIGHT AND COMPOSITE CONSTRUCTION, £47 AND £62 RESPECTIVELY, COMPOSITE SAILS – WHEN SUITABLE CLOTH A REFINED FROM TECHNIQUE WHICH GIVES A IS AVAILABLE THESE ARE MADE USING SMOOTHER SAIL SECTION THAN BEFORE, REPLICAS OF THE ‘86 BANTOCK COMPOSITE SAILS ARE CURRENTLY AVAILABLE TWO WOULD-BE COMPETITORS. MORE – THE FOLLOWING ITEMS ARE NOW STOCKED: KDH DECK TRACK, SILVER ANODISED, 500MM LONG KDH DECK TRACK, BLACK ANODISED,. 140mm LONG VERTICAL THROUGH THROUGH DECK DECK SHEET PULLEY BLOCK TUBE MAST JOINERS FOR ROUND CF_TUBES, BLACK ANODISED, 10,12,14 8 15 @ POP RIVETS, COUNTERSUNK, 2.4mm @, 5MM LONG, PACK OF 20 RUBBER BLANKING GROMMET FOR 1” DIAMETER DRAIN HOLE SHACKLE» 3MM OR DMM WIDE ADDENDUM – RAY BAKER, sTOCKIST OF GROOVY MAST & SUPPLIER OF GRP ‘NO SECRET’ HULLS – CORRECT PHONE NUMBER IS 0329 236288 – NOT AS GIVEN IN PRICE LIST. SAILS ETC, GRAHAM BANTOCK, 35 THE PADDOCKS, WITHAM, ENGLAND. 0376 516248, EAST COAST 12 WORLD CHAMPIO. manian Davi match David =ha at mimi. TMYOTT IMR tank inist shing tet] = Wai nay money lase NEW NEWNEWNEWNEWNEW “LOGIC THE WINNER OF 1985 AND 1986 ACCR. Bob Sternes latest Marblehead design now available in Europe. Any stage from bare hull in kevlar or hybrid to complete kit. We stock a large variety of carbon fibre tubes, bars and rods. For the Scandinavian market we offer the 12,7 mm carbon fibre Bantock Groovy mast in one piece (lenght 2,0 mor 2,5 m). For further information please write or call Christian Lindholm, C+#Re4Ue Cele Ael B+O+A4T41l4N4G 7s nO 22 B 02700 FOR KAUNIAINEN rer) KAVALLINTIE ra Oo FP i PRO 8. € ¢t FINLAND VA CUFT UN GC TEL: 90-5050 656 America’s Cup Style eS maewy Challenge ’86 The development almost After of inevitably smaller a two years of practical rudder Japanese Its in different Deck layout kit have was bound to happen, got there has been turned performance allows comes complete useing it to with 3 first!!! into a two channel keep a and totally radio for steady course sets of sails for in use wind strengths. is remarkably clever, giving the appearance A modern keel of with black screws used as cleats, the full size winchdrums so typical and separate rudder give giving directional With the small give power their Cupracer at 500mm long, and the yachts A.G.CO.Ltd. good sailing size, winds up to 7/8 knots, radio-control company development, machine,with a and sails. model stability to the sail area for the sail involved, control, the right of whilst also 12m yachts. shape underwater, as well as boat. a standard servo is amply strong enough to useing a swinging arm, not a drun. In addition to American skippers, three Japanese were selected from over 50 who entered the National championship held earlier in the year, and I was invited as a representative from Europe and IMYRU, to a promotional regatta in December. The regatta was run by the San Diego Argonauts, an AMYA club, and full racing rules were in force. The course was always a full Olympic triangle and sausage, of about 100m in distance from windward to leeward mark. 14 boats sailed in all The first day saw fleet racing involving all competitors, the visitors plus the best local boats. From this the top & went forward to the second day for match racing on a knockout It was at this point basis. that the manufacturers realised they had allowed their kit boats to be modified to such an extent that there were two classes effectively on the water. All three Japanese boats had been lightened, rerigged with carbon spars, panelled sails etc., most of us were sailing!!! and were appreciably quicker than the standard boats Only Blair Atwell, the Canadian M class skipper, had won a local eliminator some weeks before, and had also had time, being a student, to rebuild his boat had a boat who of similar potential!! A decision to lend me a Japanese boat resulted in two immediate wins, a point not lost on those who were in the same race, and following a protest from, oddly enough, Blair Atwell on the grounds that the loan of equipment was against the fullsize Americas Cup rules, the decision was taken to rerun these races and give us back our stock boats!!!! Shame!!!! The actual racing was to a good standard, with proper rule observance, and gave a good spectacle for a number of visiting TV and film crews, with the result that we featured on the main network TV news that evening, if briefly The event was won by Blair Attwell, narrowly defeating the fastest Japanese Itaru Ikawa,in a best of five sailoff. The third place sailoff was between Terry Allen the wellknown US designer and myself, Chris Jackson, and I lost As a well organised publicity event this regatta was superb, and it collected good local coverage. It also taught the makers something about ONEDESIGN class rules!!! From the point of view of Jon Elmaleh and Manny Costa,two excellent M class skippers who only got a few races and spent all Friday night at sailmaker Chuck Black’s house building new rigs it was a However, From the point of view of Mike Wilson, local hobby shop, bought a boatkit on a chance, three times, won his local regatta, and then bit frustrating. a young man who walked into his sailed it on his local pond found himself competing with an internationa: fleet and getting plenty of help ana advice,it was a great start in a sport he had not previously known about!!! Enough said, I think!! 16 4H w be ~ 1} onboard 4 (3) wu to un +” ay 17 further afield ITALY I have just received copies of the Modelvela Italia newsletter which gives results and details of their class championships for The a total entry of 21 10 Rater event run at Lake Garda had Sergio Sabbadin 1986. sailing a boat of conventional boats, and was won by appearance with a fin of large surface area. The RM class was run Genoa, beating U. in Rome, Rjie and G. having an entry of 30 boats, Magnani (who won by F. sailed at Fleetwood) Ciardi from into 2nd and 4th places. The RA class was less well supported in October, capricious winds only ten boats sailed. is correct stupenda”. (!) at Margherita Ligure, Gianni Magnani won here, where in and if my Italian someone got himself disqualified from the entire event! “Una giornata The main centres of organised model yachting in Italy are at Genova, S. Margherita Ligure, Rapallo, Milano, Napoli, Bergamo, Bologna, Arezzo and Trieste. About 40 RA class and 120 RM are registered as active yachts. Anyone fancy a warm summer holiday! 1986 HONG KONG RM NATIONALS The inaugural Hong Kong championships were held on Pokfulham Reservoir over the 25th and 26th of October. Sailing in H.K., different flavour to more normal venue and also large or small, is notable not only for (H.K. Island) provides a its geography but the pleasant atmosphere generated by the local members. Fifteen boats started with two overseas entries, myself and Dave Coode from England. Dave was sailing his RM1000 while I chartered Bill Zabosbe’s semi-retired SPOT which acquired a new suit of sails just before local skippers were mostly sailing CEDAR IV’s the start of the first race. The with BONES and TOADS completing the fleet. Under the control of 0.0.D. Peter Wood the first race started in strong gusty winds which funneled down the valley into the reservoir. This took its toll of entrants causing many RTD’s and D.N.F’s throughout the first 12 races. Dick Eastwood made an early break from the fleet with his well prepared and sailed CIRCUS and was to prove to be the skipper to catch. Saturday night was spent at the Royal H.K. looking across the water to Kowloon. Yacht Club in its spectacular setting A very enjoyable B.B.Q. was organised for competitors and we were able to relax and unwind after what had been a hectic day. Sunday provided a contrast in conditions with light breezes allowing some tactical sailing in very pleasant conditions. Dick Eastwood opened out interesting his lead in conditions which suited his boat and also gave him a chance to display his sailing skills. The minor places were being fought over by myself, Kevin Wadham, Dave Coode and Jez Collier which was in fact the order in which we finished. A most enjoyable prize giving was held at the Spring Deer Restaurant in Kowloon where Dick Eastwood with his usual gusto helped us celebrate his victory. excellent feast was finalised with a serving of Peking Duck and the An total consumption of the 0.0.D’s presentation which was rather hard on Peter Woods after the excellent job he did. My thanks to all the H.K. shown to my wife and I. members for an excellent weekend and the hospitality I look forward to returning for the next round. Bill Pettingell Sydney Model Yacht Club 18 + bg ge A gS ae pp te ey Re orga j Ripe vce ey Fa LZ “Z BUSH MECHANIC’S SROUTE TOP AMODEL YACHTING et ie ves SE: 7 M.S. maid te ke Z sf: This is the second half South African Model great deal his No 27. of Copies donation of tocover oo clepes of the Yachting time the the article Assn., encouraging full size costs. in presented to memory her newcomers drawings are All proceeds to 19 of in the IMYRU late on Mrs.J.Latham of husband hobby. available IMYRU. by Part 1 request, Mike, who appeared for a the spent in small a issue HOW TO BUILD A MARBLEHEAD -or- The Bush-mechanic”s Route By Mike Secretary MYASA, 2… Model Yachting Latham Vice-Chairman NMYA, PART to Gualified Bush-mechanic. FITTINGS Well, here we are again. I¢ you have got this far, you are likely to go the rest of the route. However, things get a bit more difficult. Seeing as how this is the Bush-mechanics Route, the following remarks are addressed to fellow Will all instrument bush-mechanics only. specialists, model engineers, tool and die makers and other competent people Kindly leave the roan! It is assumed that your wife, haying gotten over the shock of having her best pot used for melting keel-lead, is now resigned to letting you use the table for finishing the monster. If not, consider stamp-coliecting or change yctr wife, First, a word about tools and materials. Tools first. You will need:1. Avice capable of being clamped to the table. It doesn’t have to be a big one. 2. A hacksaw, 3. A set of files. Get a coarsish cross-cut for quick filing a fine flat finishing file a rat-tailed (round) file others if you want. A set of needle files is useful but not essential. 4. A fretsaw or jewelier’s (piercing) saw plus ten or more of the finest piercing saw blades plus a few coarser (but not too coarse) Diades. These all break easily, The finest Kind have a tooth pitch of «025mm (1/100″) or less. 5. A hand brace. 6mm (1/4) is O.K. 6. A set of drills, Imm to dw (1/32″ to 1/4″), Get the best. 7, A medium pliers, Gas-fitters pliers are surprisingly usetul, 8. A good quality miniature side-cutters which can easily cut 1,Smm (1/16″) stainless steel wire. 9. A sSnipe-nosed pliers. In addition, if you can get the miniature Kind which has one jaw flat and one round and tapered you will find it very useful for making hooks and rings. 10. A tap-wrench plus a set of M3 (or 8 B.A, or equivalent) taps. These come in runner and bottom tap. Use sets of three: starter, the tapered one first, followed by the runner (straight with a bit of a taper). Use the bottom tap only in blind holes. Use all of them carefully and slowly, and lubricate with oil while tapping. Dies are occaisionally useful too. 11. A centre-punch. The automatic Kind is easy to use. 12, A scriber. A needle in a pin-vice is fine, and the pin-vice will be useful for other things, such as holding small drills so that they don’t break so easily. 13, Some method of silver-soldering. Silver solder melts at about 1200deg. s TM . = blowtorch. It is F. The simplest is a meths hell to use. Butane torches just reach the right temperature if the part is not too big. Best is a butane-oxygen torch. Miniature ones are available. 2 * 2 . Cultivate a friend who has a welding-torch, or chat up your local auto-mechanic. e You will also need silver-solder and flux. Ordinary borax works quite well. Apply flux, heat to red (just) and apply silver-solder sparingly. Do not mix up your expensive length of silver solder with your stainless steel wire: it looks just the same. Quench work in oi] to restore temper. Quench thirst with beer to restore temper. Better still, get someone who Knows what he is doing to do it for you. 22 Because of the difficulty of silver-soldering I have avoided it as much as possible in the design of fittings. The only item really needing it is the main boom kicking strap, and this could be avoided if a turnbuckle with a loop at each end can be obtained instead of the one shown. However, the ability to silver-solder is highly desirable in model yachting and should be aimed at. Now for the materials required. 1 have shown PEKABE (P.X.B.) commercial fittings wherever possible and they are generally excellent. However you will also need the following: A small sheet of 0,8m (1/32″) stainless steel. A small piece of 1,5mm (1/16″) brass or 2mm (3/16″) aluminiun. A quantity of M3 (8 B.A. or equal) stainless steel machine screws complete with washers and nuts. 25nn (1″) long should be 0.x. A quantity of 2,5-3,0mm dia. (approx) stainless steel countersunk self-tapping screws, again about 2S long. A length of 1,5mm (1/16″) stainless steel wire. A length of 0,8mm (1/32″) stainiess steel wire. (Note: brazing rod wili do for hooks etc. but is inferior) Two duraluminium arrows 6, 25am (1/4”) diameter of the Kind sold to archers. A quantity of black rubber electrical grommets to fit dam (or slightly less) diameter cable notainable trom your local radio-spares shop. They should be a tight fit on the arrows. Sone scrap aluminium shop-fitting sections especially thin-walled (1!-2an) “T’ section. DO NOT BE TEMPTED TO USE BRASS IN LIEU OF STAINLESS STEEL IF Y8U USE BRASS AND ALUMINIUN IN CONTACT WITH EACH OTHER (UNLESS HEAVILY CHROME-PLATED) YOU WILL NOT HEED BATTERIES! ELECTROLYSIS WIiL DO THE TRICK Finally befory we get down to detail, a general word about model-yachting and bush-wechanics. Those bush-aecharics amongst you will understand when | say that the essence of a true dush-wechanic is the adility to imorovise. fhe tails snown on the drawings are this particular bush-mechanic’s ideas, and may not. in fact, represent the sctuai details to be found on his own model yacht. An attempt has been made to use PEKABE (PKB) fittings wherever reasonable in order to minimise manufacture. Other excellent fittings are also available for those preparec ts import them. Many items can be substituted or made to suit. Just bear in mind that model yachts take a considerable strain on many of their parts. Eventually you will get a “feel” for the kind of strength necessary, compatible wich Tight weight and good performance. Even then, something may collapse at a crucial moment in a 25 knot wind! Figure 1 represents the stage you should have reached if you have followed Part One of these instructions. Ir it doesn’t, go back to START. You are probably itching to put the fabric deck on. Well you can’t. You have an important decision to make first. It is this: are you going to mount your winch above or below deck? For those of you who have bought a winch unsuitable for deck-mounting the decision is already made. Generally, FUTABA winches are tov heavy for deck-mounting on a Marblehead. This isn’t to say it can’t be done, because | have seen it done. It is just rather difficult. Other types of winches are generally also of the under-deck mounting type. The Barry Jackson winch is an exception. It is lightweight, and easily mounted with the drum above the deck. This type of mounting has the advantage of being simple to service and adjust. I have heard that the system adds wind resistance, 1 don’t believe it makes any difference. Under-deck mounting is neater, and keeps the winch below out of the weather. However the fact that holes must be provided in the deck to let the sheets out outweighs this in my opinion. I am told that not much water gets in, A little is a lot where radio gear is concerned. In fact, ANY water is far too much! Of the winches which we repair, 50% are damaged by water. The other 50% have been stalled for an unacceptably long period ‘about 30 seconds) of which more later. Anyhow, Figure 2 shows the general arrangement of the under-deck type of mounting, detailed in figure 2b. The idea is to mount the winch in a manner in which it can be easily removed. I have shown one idea. Others will no doubt be Just as good. With this system, the forward part of the yacht is used for the winching !ine. Because you have no forehatch, you ERG ex ay et lee ie ey en Ge See rece eee ANDRO hOGA nds Shediac nn” Thonwlens ihetal the even. Tene 23 and block shown in Fig. 2a at this stage. Make sure it it sufficiently substantial to outlast the boat. The line must be twice the length shown to enable it to allow the block to run aft as far as the hatch for maintenance. Figure 3 shows the above-deck system using the Jackson winch. In this case you will need no special forepeak fitting, since you can easily reach the winch from the hatch, and all its winching line is above deck. Figure 3 also shows the position of the rudder servo, mast step and jib rack. Instal the tube for the receiver aerial at this stage. It is hell trying to thread it through a hole in the stern after the deck is on! Now look at Figure 3a. This shows the method of mounting the rudder servo. Below deck mountinas of rudder servos present many difficulties, and are not worth it. Waterproofing is the only problem, and will be dealt with later. If you have the Jackson type of winch, make a similar mounting for it. Figure 3b shows a simple method of tensioning the return cord of the winching system. Arrows show the direction of pull. If you have the beiow-deck system, you may set the whole thing up now and try it out. If not, note Fig. 3b for later. In any case: THE WINCHING TENSIONER MUST NEVER BE ABLE TO JAN AT EITHER END AT FULL THROW (INCLUDING TRIM) OTHERWISE YOUR WINCH WILL BURN OUT! Early winches had a single instead of a double drum. Some have a single tapered provide exponential differential sheeting. If you from as an option. This is to don’t Know what this means, forget it! All single drums need elastic to provide return tension (instead of a return cord as used with a obtained drum double drum). Use thick hat elastic your local draper. It perishes quickly, and you will have to replace it often. It is not a very qood system, and is not illustrated. Figure 4 shows the jib boom and rack. Both booms are made from arrows obtainabie from any good sports shop. They are made from tempered Dural alloy and are very light. They are strong enough PROVIDED you do not drill them along their length. The Jib rack is a PKB part or you can make it from scrap ’T’ section aiuminium. The swivel is a ball-bearing fishing swivel. Buy the best. It 1s attached to the boom with a spring-wound bit of stainless steel wire as shown. It must be able to slide along the boom, but not easily. Sail attachments are made from hooks and grommets along the lines shown in Fig. 6 for the main boom. Keeper grommets are shown, since the single grommets may slide when you don’t want them to. The grommet system is not as elegant as some, but it is much lighter, and easily adjustabie. Bear in mind that the yacht is a machine designed to win races, not the “concours d’elegance’. Figure 5 is a crosstree for a 12,Smm (1/2) diameter mast. Depending on the aspect ratio of your sails you may only need it for the ‘A’ rig mast. Make one for the time being. The design is not critical, but being has the advantages of foldable-up against the mast for transport, and easy position adjustment. It also avoids drilling the mast in an area of critical strength. Figure 3c shows one method of making neat loops in terylene cord. Whip the loop as shown and drip a drop or two of cyanoacrylate ‘superglue’ on the finished whipping. Or tie a granny Knot and hope for the best! Figure 6 shows the main boon fitting. Some people make a whole mast and boom for each suit of sails! Us bush- mechanics are by nature lazy. The fitting shown does for all masts. It is quite easy to make except for the kicking strap. The boon clamp for this MUST NOT SLIDE. The turnbuckle can be any Kind. Not very much adjustment is needed. The short stays are necessary to resist forward thrust in deck-stepped masts and maintain mast straightness. You can try out the boat and establish the best mast position before making them. Please get the goose-neck and Kicking-strap attachments in vertical alignment, or your sail tension will vary as you let the sails out. The tubing required is: You Mast and outer sleeve of boom fitting 12,5 dia 1,2 wall thickness Inner sleeve of boom fitting (200 long) 10.0 dia 1.0 wall thickness will need a dm length of the 12,Sam dia and a 200mm length of the 10,0mm dia. The tubing is readily available from aluminium section stockists. Figure 7 shows the masts themselves. Each mast is made to length to suit the sail it has to support. The main thing is to ensure that the 80% rule is Kept. I have tried to show this. It means that the POINT OF INTERSECTION of a line extended up the luff of the set jib shall not meet the mast at a height measured from the deck more than 80% of the hoist of the main measured to the bottom of the eye. Note that this is not necessarily the position of the hole in the mast for the jib hook. Make this hole a little lower than calculated to be on the safe side. Each mast will have its own pair(s) of shrouds complete with turnbuckles (PKB 482). They can use a common backstay fitted with a bowsie. Finally, Figure 8 shows the method of jigging up for the making of shrouds. If you use a long bit of 50×25 (2″x!”) timber for your jig, you can set the shroud lengths up on it and get them exactly equal. Keep this Jig. You never Know when you may break a shroud! I know, I know, You still haven’t put the deck on. However, | hope that you have drilled all the holes required, fitted everything in place to see how it looks, and maybe even tested the whole thing in the local swimming-pool. 0.K. You can put the deck on now. Use COVERITE aircraft covering material. Accept no substitutes: it is the best. Remove ALL fittings, and make sure all wood surfaces are sanded clean and smooth. Cut a bit of COVERITE long enough to do the whole deck and lay it on the deck framework. Using a not-too-hot iron and starting in the middle, carefully iron the deck onto the framework in accordance with the instructions which come with the material. It shrinks tight as it goes. It is not all that easy, but easier than one tends to think. When it is all on, trim around all the edges and run plastic masking tape right round to make a colourfui trim and a watertight edge seal. Put the fittings back, and admire the effect. You may have wondered what he square thing shown below the hatch position in Figure 2 is. Well, it is supposed to be a tray made from 2am ply and other scrap bits of spruce designed to fit your favorite margarine’s plastic box. Eat the margarine and wash the box. It is a handy, lightweight container for all your radio gear and batteries. Epoxy the tray to the bottom of the hull and hold the box in place with an elastic band, You want to be able to it get into in a hurry if necessary to change batteries and things. Your on-off switch can well be mounted on this box since your Willow plastic hatch is so easy to remove. Nearly all deck-mounted switches give trouble. By the way, the method of waterproofing deck-mounted winches and rudder servos is as follows: 1, Grease the shank only of the servo (winch). 2. Put a blob of silica rubber around it. 3. Press the whole thing up through the hole in the deck so that the around the greased shank, and insert mounting screws. silica rubber oozes through the hole 4. Grease the bottom of the servo arm (winch drum) and press it in place. 5. Allow the silica rubber to dry thoroughly. The grease will stop it adhering to moving parts. Once the silica rubber is dry it forms a reasonably watertight seal around the moving parts of the servo (winch). Take the trouble to remove the equipment from time to time and inspect it for sions of water-damage. If sailing in salty water wasn the equipment well in fresh water from time to time and aliow to dry completely before replacing, If you apply new orease to gears etc. AVOID getting it on the feed-back potentiometer (the bit to which wires are connected). Electronics don’t mind fresh water, but hate grease! You have earned several beers, and if you take my advice consider inviting your wife out to dinner She has probably earned it too. WATCH Mike Latham, May 1985. THIS SPACE! at this stage. “THE FASCINATION OF THE A review of The wellknown To me, the produces In past 1969 National the designs, “A” Class of is the Titles for the future, well named, as to most by ADRIAN BREVER, yachts which are first A boat called in Adelaide where designers improved, This was a definite she came a close “Sound Lffect” – “SIZZLER” I in time built second. were was obvious concepts that with and had developed mediocre off Olympic maintain good as L.TM.L. seemed course 54 the State ins. I was dronoed Challenge, experiments which was my first The next and under once again were between 35 and OXY LOXY” show the quick was a sceptics to build. another the 40 spent chine lbs., Rule, R/C The currently sailing but most vane as Vane were quite lbs plus to (measured) of the with home to Sydney’s the sail still this could took one of 27 lbs. sail and for the But on a this was fleet of converted Vane noteworth being “MACH 2” sailed her to win the 1977 large margin. around sceptics!! I were virtually a bit radical the most much more version that a chine boat The next year Pat Cox also this was success when Rod Carr by a very boat designed by 50 sq.ins. but the L.W.L.s were Rooth in fourth place. Rod Clack took one to Sydney in 1975 for an the playing multi-chine Alex the normal 800 making a bigger hoat which would get “D> for sailing advantage of decisively outsailed International few years from However were made ‘American Nationals, take only allowed boats. Several windward sailed his skipper. design-wise, needed features way to go as the numerous off-wind legs of a leaning more towards off-wind speed while trying to my first design to undercanvassed in light airs. Inter good was she won logical invited a the displacement of for windward ability. “ZIPARDEDODAR”, time, primarily “A” 1975 1972 into being. “Cougar the wind. A planing type hull typical type of which for the and and Max Griggs 1976 Nationals, quite conventional, a different 1974 “SOUND EFFECT” A’s fitted with R/C gear. It it In 1979 Nationals with George Fish as sailed a very competitive version of “Sound Effect”. however, the top Rule, sail. again won the These boats, is delight to especially downwind, to win the it but there were a couple of and a re-design brought improvement, a “COUGAR”. I was quite pleased with the boat, which could be “Sizzler” and forecast finest model designed my event. CLASS RULE”. Australian designer. some I ’A’ “Zinardedodar” The displacements around line of 54-55 thought be competitive, Sydney Kevin in concept, 1978 Mitchell in increased to ins. and as well and but won the designed partly as cimple and being Nationals, second place. So to with much for drew a round bilge version of “FCXY” so I could broduce her in fibreglass and this was the now famous “WIZZLE WwoZZLE” design which Pat Cox has sailed consistently to win numerous Champions hips including three National Titles. boat I am “Zipardedodar”s Pat. In fact, Dave WHAT there Always wind THE suggest In drag, by the three three difficult “SHARP boats SHOOTER” at Albert ane the provide this in trend when pulling boat thing to which means reduction weather but Length, a that light 211 further, Rule ineans a is basically but I can’t quite get Park which are oricinal very which “Foxy Loxy”, close, exciting but my own very now a big the edge over close in performance, sailed very well racing. FUTURE? a very speed are “Sharm Shooter” Thatcher. OF is It is a very competitive boat, “Wizzle Wozzle”, by sailing the gains lighter weicht L.W.L., works the predict, boat ends sailing but well, is of overseas and not the length is not heeled, boat out quickly thoughts and more sail. experience a great have and Sailing the to imrrove To do this under in other classes the seens off- the to disadvantage. vou as are low wetted with breeze a area long freshens. giving Quarter reduced Bean I have just completed 2 designs using similar ratina figures. “RLURPFD IMAGE” is a multi-chine design which I advertised in “Airborne “iagazine” This boat sails on a 48 ins. L.1.L. displaces 2@ lbs. and carried nearly recently. of ~measvred 1300 sc.ins. sail. I have also dione a round bilce boat for Fibreglass preduction and this one J have been able to set to 26lbs. with over 1300 sy.ins. of sail, also on 4 4% ins. 4.14.1. 1 I had seven orders for this desicn before the plus was started ane this has grown to TEN before the plug is completed!! Some people must also think that this is the tay; to go, but as the old saving goes – “only time will *MITH THANKS TO THE ALRFPT PARK MYC NEVSLETTER tell”. (AUSTRALIA) IN WHICH THIS FIRST APPEARED WOMBAT 36r designed by: FRANK RUSSELL The Wombat was designed mid 1984, build and sail for a club member who wanted a small yacht to in locations where it was impractical to sail his 10 rater. yacht was to also be a try out for a class suitable for juniors, existing yacht class would be best. 36/600, due to its simple rules, and being particularly important because limited its shallow draught, small i.e. the latter class was the shallow draught sites suitable for deeper draught yachts are locally and generally throughout Australia. essentially it was felt that an After looking at all existing classes, International One Metre, Olympic One Metre and the 36r, selected, As the Marbleheads and are subject to All all the other classes are the measurement problems of that class. The yacht unfortunately was never built, process, and only the sailplans 101b displacement, that would chine and develop and to and redraw the yacht. foils been have is well balanced. also be easy to features minimal speed reducing plank, twist hollows in 0.8mm ply (not lmm) The balsa should The foils are or 2.4mm have one simple Any circular If close attention layer of parallel bulb as is lower as shape is as last two originally drawn, The hull is a moderate? (oz) being fast. bows and should be stern, which can sealed be made although a hull is unless with a tend to epoxy in are either inside and out. the outside. from glassed shape 71b bulb double the panels be easy to plank woven glass on saving, The Boats with twisted panels should suitable is paid to weight hull slightly changed. well which planform, shape The The boat 30g the design Emphasis was put on producing an attractive their balsa, was made during Studying this model over the in the panels. conically or cylindrically developed. cedar. half model which now hangs on my workshop wall. years has encouraged me hull but a is balsa or provided isn’t out of at 6.5lb. the question and will add to performance. Three rigs have been for a skipper knowledgeable as For the drawn new to the rig/sail at class maker. 800, 600 is to The and 400 study the vacht is square inches, too boats and suitable for however the best thing seek the advice of a swing and una rigs as well standard rigs. information on the Wombat, Russell, 25 Britannia st. send a large S.A.=. UMINA 2256 NSW (160 Australia, Europe. 26 – 220mm approx) or M.Y.N. to: if you live Frank in MODEL YACHTING ASSOCIATION CHATRMAN’S COLUMN Being my first Colum, the views of the the end I have I must admit to some trepidation as to striking a balance between stating Association come to and the venting conclusion my own opinions upon an unsuspecting readership. In as discerning subscribers to the Model Yachting that, News, you are well able to distinguish between the two. Rightly or wrongly I have decided not to follow too closely the format adopted by my predecessor, preferring to restrict myself to fewer topics and to try to cover them in a somewhat different manner. NORMAN HATFIELD Whilst mentioning best of Health my and matched only by predecessor Fortune. the of the Association The regard and I we in must not amount which of he let the opportunity pass to wish Norman the very work that Norman undertook for Model Yachting is is held within the sport. Norman remains as President know that we can rely upon him to make further valuable contributions in the future. THE AMERICA’S CUP — or — THEY WOULDN’T BELIEVE IT There can hardly be a Model Yachtsman in the UK whose interest in this competition has not been further stimulated both by ‘Project Acorn’ and by Dave Hollom’s ‘Crusader 2′. What a pity then that the input from Model Yachting has been largely ignored by the White Crusader Syndicate; particularly Surely the failure ‘Credibility to as so adopt Factor’ – much and and of adapt it is it has been technology mot the proved over the last twenty years or so. from Model Yachting has a lot to do witha Model Designers who stand accused of being ‘small -minded: On a brighter time, as, note, it looks I understand, up the Challenge. that Should as there any if there will be plenty of opportunity for innovation next are at least four UK Syndicates seriously considering taking of these have any serious doubts as to the worth of a contribution from an able Model Yachtsman, then perhaps they should have a word with Alan Bond. M CLASS RULES REVISION In an attempt to end all further speculation and controversy it has been decided that, immediate effect, the M Class will consist of yachts measuring to the following formula: L La/sS 4+o/8 + kal = MARBLEHEAD “A” rose by any other name…….. MORE OF THE SAME It came to me in moment rash, Give me a hull that’s black and strong. Georgeous thing so sleek, so fine, And never mind the doubters leer, To hop, to skip from wave to wave, In dusty attic it may rot, And Downwind dive to watery grave. A Marblehead — Oh no it’s not! Oh man of money , wise and sage, They’ve changed the rule, they’ve changed the game, It came toward me in a flash, Come on my lad, Get out of bed; You’re going to buy a Marblehead. Soon this creation will be mine, Please grant me that second mortgage. With Carbon, Kevlar, it will fly; No matter that the coffer’s dry. Give me a winch that can’t go wrong. Give me those sails of white and amber; Dam the expense – What joyous camber. And never mind that come next year § They’ve changed the numbers in the frame. That’s why, dear reader, come next May, You’ll find me sailing my old vane “A”. A Happy, Prosperous and Healthy 1987 to All. y Peter Maskell with An update on this neglected class, in the year of thetr world echamptonshtp, with some designs from vartous countries. In response to my comments in from the Jon Elmaleh and Frank Soto, U.S.A., class. They “Of the fifth 17 thanks to individual of have now got some more information two enthusiasts for the This position is helped by the in both M and 10 classes, the 10 fact Rater ranks that in the economising on the to be found in Central Park-New York, San Diego, other countries the americans have found the boats very and coin the phrase ‘ condition specific’. length is closely related to the prevailing There are very few 10 rater kits on the rate, Vancouver, and Toronto local weather, will I yacht classes recognised by AMYA, rate the same hull fleets are San Francisco, all issue boats and radio gear! larger Like model in active registrations. number last write; USA you can dual The the local market, and the class is obviously dependent sensitive to In other words the W/L winds. although one or two ONE-DESIGNS on the M boat hulls to keep up size. fleet From Europe I hear of some Goteberg helping here. around new lightweight boats being built, with the impetus of Waterlines are now down to M class figures and weight 15/161b. In England the intrepid Tony Abel has produced a new 10 rater kit, FLAMINGO, and its dimensions are also in the same area, so it would seem to meet the demand for a moderately priced boat for club sailors who fancy a go at the class. FLAMINGO R10R. Designer; Tony Abel. LOA; 62in. Beam; 12ins S.A.; 1365sq Wt; 151bs. in. Hulls available Total kit plus £8.00 Kit in Red, price £123.61 for lead bulb includes hull, fin, fittings,alloy mast, deck, booms. panelled sails,rudder, Details Blue, etc. from; Tony Abel, Highnoon, Petersfinger Salisbury, Road, Wilts.SP5 3BY. Tel; Salisburyl 0722] 24677. Yellow. one meter THE FASTEST GROWING CLASS IN ANYA Plans and building instructions ere available for the following: All hulls 39 3/8” L.O.A. Flat sides, round bottom. A good choice for inexperienced builders. RCO 2° ot CTR “Try new it, you’ll like it! One ones. of the ‘ “TAOPULE” one A successful design in this class too. meter Classic design. Extremely stable. AMERICAN MODEL YACHTING ASSOCIATION Olympic One Meter Class 1.0 HULL: 1.1 LOA (including bumper, if used) 39 3/8″ maximum. 39″ minimum. Mono-hull. 2.0 SAILS: 2.1 Sail area 600 sq. in. maximum “measured triangle (must have main and jib). Measured to edge’ of sail material. 2.2 Mainsail: 2.2.1 Luff—60″ maximum and 3/4″ maximum across top (see drawing). Including headboard if used. m corner of 2.2.2 Roach—2-1/2″ maximum measured frowin clew to top of sail as shown in dra g. 2.2.3 Rounded Foot—1″ maximum. 2.2.4 Battens—Two times measured maximum roach. Four battens permitted (maximum). 2.3 Jibsail: p 2.3.1 Roach 1-1/2″ maximum and 1/2″ across tod. (see drawing). Including headboard if use 2.3.2 Rounded foot—1″ maximum. 2.3.3 Battens—Two times measured maximum roach. Three permitted (maximum). MAST: 3.1 Mast height above deck 65″ maximum. 3.2 Mast diameter 3/4″ maximum. BOOM: 4.1 Boom and club diameters 3/4″ maximum. RADIO: 5.1 Radio control—four (4) functions maximum. RUDDER: 6.1 Rudder must be aft of keel fin. g. in aw dr in n ow sh as ed ur as me , x. ma th ng le ” 7.1 14-1/4 KEEL: PROHIBITED: 8.1 Movable keels, shifting ballast, bilgeboards, tunne! hull. Trim tabs, rotation mast, wing sails. LOGO: of d 3r r pe up in d ye la sp di be to go lo s as Cl 1 9. mainsail. (See drawing). 10.0 SPECIFICATIONS: 10.1 Per attached drawings. 30 OLYMPIC ONE METER CLASS NOTE: LOA is measured parellel to waterline. Le 3/4″ MAX. 39 3/8″ MAX. 1/2″ MAX. OLYMPIC-ONE-METER and other ONE METRE classes. There has for some years now been a view that a class smaller would have a strong following among model so complex and expensive, size and weight In the U.S.A. large number we are this and radio sailors, equipment now that has been than the Marblehead the M class has become developed to the minature used to. interest has produced the OLYMPIC-ONE-METER boat, have been built. of the class originators, Our cover and quite a picture shows a prototype boat Bob De Bow,who is shown, hatless, built by one with his co-partner and friend Bob Jensen. IMYRU and NAVIGA were put to their have existing annual Both organisations are what concerned that the classes meetings to adopt impressed with the reaction. At the have fallen into disuse, same idea of the size,ONE-METRE, with any others they can find of time they need to mind having their rule modified to and proposals this class instead. rule as written could be exploited to become They decided to circulate the rule, to get that know whether the but a are some mini-M class. similar size, originators will include restrictions such as are mentioned in the letter overleaf. The U.K. has its own problem in the many registered boats, but I know of Underwood has a GRP mould for one Just because become a well for local the of several fleets which could be HOME-BUILT, of the and class does not I offer 36” class which has here, and Bob YOUR VIEWS ON THIS RULE WOULD BE OF but retain the same to MYN. the transmitter back, INTEREST TO THE mean it should not it to readers as a basis has sailed the UNDERWOOD boat difficulty persuading him to give I can pass these on if sent existance ONE-METER boats sailing adopted the its own merits, IMYRU chairman, the from which the Poole Club is making up a ONEDESIGN board has not liked class on Norman Hatfield, great IMYRU fact overall dimensions. and its owner he was so had impressed!! IMYRU TECHNICAL COMMITTEE, and A NEW SMALL CLASS REQUIRED??? I was interested to read Mr. Gould’s letter about the 36R Class in MYN no.26, find that other people also feel a need for, shall we Class, Zakoske’s the more ‘Olympic’ so as it was followed by Mr. 1400 boats on the 36R Register, effect the major change number of sails the 36 requires, Here, and, at so the Mr. Zakoske’s the l-m Rule. and suggestion, The and name of it has asked Bob the result, same one hears grumbles time, concern the the rising cost if “Xtenchun” he could produce reveals last 3 months, rather a boat to fit than conceals enabling the its following to be made:- Infinitely more attractive than 36 in appearance, advantage in itself) and a more out-perform the 3. Could cover all conditions – certainly at Setley – with two 4. Same price range as a 36: lead bulb, in anything more this hull, ‘M’ (an 10 knots of wind. suits of sails. to Bob Underwood’s immaculate standards, cost about the same class mast. A quite delightful little boat to sail writer’s opinion, than rudder and rudder tube with PTFE bearings, as a bare langth of C/F tube for a freeboard sail plan. Will with fin, 36 ‘inboard’ with higher 2. 5. at about so one of our members forestalled Underwood been sailing for the impossible to a fresh start would be needed, at Solent, of trying to remain competitive in the RM class, 1. small suggestion of the American it would be almost suggested to the Rule, and the 1l-m could be such a start. comments a more up-to-date 1 metre Class as an acceptable alternative. With approx. origin, say, and in all conditions – much more so, in the than its 36 fore-runner. To these could be added:- a. Easy availability of current American designs, from Class Secretary b. Main luff (60″), Sail Area (1 metre), (600 sq.ins.. fin depth 24″ 9 (144%” from bottom of hull to roach on main), with mast head rig allowed. weighing in at 8: – – (name and address supplied with pleasure!) Simple Class rules – L.O.A. bottom of bulb, at low cost – 3 dollars U.S. Weight not mast height restricted, (65″), but top boats lb. c. Possiblity of incorporating in Rules, for U.K. at least, clauses banning use of the ‘exotics’ in both hull and rig, ensuring continuance of competition at low cost. In U.S. home-building, Championship, in balsa and glass, 5 of top 6 boats were I am encouraged in making suggestion respected fittings makers 36 although he class, may be too planned, is is keen (c) by a recent supporter of late to achieve this, and in recent 1986 in this category. in which he felt the a encouraged, knowing letter from one of our most ‘exotics’ them in should be the ‘M’ kept class. I some have been built already, out of the am afraid it with others so a completely new Class may be the only hope of a Class offering good competition without the high, encouraged further by the country by ‘unilateral action’ and increasing, recollection that of considerable opposition, cost of the the by one small Club even organising and Championship for the Class before ‘M’ Class (Ryde) ‘high-tech’ itself was boats. I am started in this which adopted it in the face running the first National it was adopted by the M.Y.A. ERIC SHAW. November 1986. See also the item on the new WOMBAT 36R and letter from Frank Russell, who refers to the snags in the O-1-Meter rule. Another rule of the same “= size is the MINI-CEDAR being promoted by French NAVIGA. LETTERS TO THE EDITOR This letter was written in response to the November issue of R/C Boat Modeller.and is a personal reply to the charges of team sailing at the M class worlds which took place at Fleetwood. Let us hope it will be the last word, as it shows a much needed sense of humour!!! I have read in R/C Boat Modeller, P16, that the French sailed too much like a ’team’ but we were not perfect, and we made some errors, for example; Boisnault forgot that Lucas is from Brittany, not Great Britain, and touched him at a buoy. He did the same to me, probably because I live near Switzerland! Faucompre forgot to touch Bantock while he was doing penalty turns, and tacked about to avoid him. Perhaps his new position on the board of IMYRU was the cause of this horrible mistake, which condemned Venot to fourth place! The attitude of Jahan and Lucas in the last race was UNFAIR. Why did they not wait for Venot, to play together and assure his third place!! Fortunately R and L Smith, helped by Cole made a race with him, at really close quarters!! Bantock meanwhile had better More things to do, and didnt stay back with them!!!! seriously, Each skipper at the championship,and I thinks that all the world is against him. The game of go on a long time,but it is lost was one of time!1 It force six. Just their thing else to write It the French is true magazine,Model TALENT and their about time or another, example and counter example or to Jahan and Lucas their domination BOATS!!! I regret that you didnt team at Fleetwood came with fighting spirit, published a chronicle about it! Selection was based and the sixteen members of the team had a regatta ONE WEEK Gilles Garidel, No sooner “A” had CLASS I comments on it Several have KEN BUTLER, Early in I be to able Roger My a for well of the the decide to compete issue of known English first drawing MYN “A” than recieved the plans ‘A’ boat equally for boat. with the attempts the short could design at Sykes built amounted to the late sail ended the the been made, but the drawing exceeded all RADIO or The of aim was to enormously Bill Sykes, produce successful is the Albert area 54” two Marbleheads, Sinar a which ‘Copycat’ boat never got usual LWL ‘A’ that my expectations and The drawing has not is fullsize are perfectly clear and built. would be my guidelines and after boat plug with great because the original on I now a fellow club ‘Lollipop’ with a displacement is I so well think still by Peter capable of rather proved suitable faint. I can sell body sections and halfsize the Dyeline copies, 33 for I £7.50 two I thought to produce VENCEREMOS performing well plan and side which cost it Maskell. for and decided that best reproduction photocopies would designed by one or accuracy and later modified is sailed that ‘Skydiver’ was the VANE boat. EDITORS NOTE: some original. time. currently successful and class design VENCEREMOS. have is the I comments; design an “A” 1200 sq.in. the Lyon, France. Stollery. 501lb Bill last instigation and encouragement previous experience boats trying KEN BUTLER. serious enquirers 401b and I the the designer, 1979 at member, out the derivatives available DESIGN. sent for find some each month my before Fleetwood,with some people travelling 1200km to get there!! But on the scaffolding each skipper was alone, with water,wind, and 11 VENCEREMOS can the French Yachts and skippers. Reduit De Bateau, on 1985/1986 results, one was not team racing that gave Graham Bantock his good performances in light airs, in them,at as a in this issue, the design which elevations. including post These Model Yachting Association ANNUAL 42 members of item listed What GENERAL the association on the follows is a agenda MEETING, gathered for for the discussion. summary of 22 6.12.86. AGM, despite clubs out of there 67 were being only one represented. items discussed. RADIO FREQUENCIES. The talks with the frequencies once LEAGUE RESULTS The Chairman RADIO. DTI the were slowly getting Joint Users Committee and it had commented, was hoped to announce probably in new 1987. 1986. presented Division the awards to the following; 1 Chelmsford 2184 Division 2 Birkenhead 369 Division 2 Division 3 Ryde 177 Division 3 Individual G. Bantock 423 Individual Once again Peter Somers was the results, VANE. thanked for the Division vast 1 amount Birkenhead 1399 Gosport 302 M. 360 Roberts of work he puts in to obtain figures. RETIREMENT OF NORMAN HATFIELD. After over 50 years in missed a single the council In recognition of his MYA, and meeting, immense the years as chairman during which he chirman services ERIC NUTTALL TROPHY was presented also given a specially affiliated clubs, 10 to the him for bound album of and a cheque to had announced his Association over life. As more photographs and subscribed by clubs and not retirement. this personal messages had of long period, the tokens, goodwill he was from the individuals. NEW OFFICERS. As a result of the above, chairman, CHAIRMAN. and the decision of Chris Jackson there were several Peter Maskell. RACING SECRETARY. | to stand down as vice vacancies which were filled as follows; VICECHAIRMAN. Ian Taylor. Derek Priestley ‘M’class REGISTRAR. David Rose. Both the chairman and racing secretary were unopposed, but elections were required for the other posts. Chris Dicks was narrowly defeated as vice-chairman, and Don Fowler as registrar. Concern was expressed about the use of proxy votes as laid down in the constitution,as it became clear that one delegate was holding enough proxies to sway the election to the candidate of his personal choice, to the embarrasment of both candidates.Council were asked to look into this problem at their next meeting. TOO MUCH CONCENTRATION ON THE This was the gist of ‘M’ The clash of dates with important NATIONALS being held on the class events, stands,and endless discussion of wrong bias In to the presentation response, the use could also be model boat available, The magazines to and only the of made by make ‘M’’ ‘M’ class boats on association exhibition class pointed and the ‘M’ out Peter 26 a totally the meeting that Council was a current problen. their supporters of uncommitted is; to rule the unprecendented modellers aware fullsize magazines were also a new chairman’s address rule gave,in his view, the sport. outgoing executive discuss problems as they arose, More CLASS?? Ian Taylor’s motion which allowed an exchange of views on a wide range of topics. same day as big ‘M’’ possible of met to selection of the alternative classes publicity outlet. Maskell, Woodhall Woodhall Pudsey, Croft, tels\05382=-577522 Lane, W Yorks, LS28 7TU ATTENTION All | Vane Sailors FLEETWOOD hosts the following national championships in 1987 ‘M’ Class 2″*-4°May ‘A’ Class 2″*-7″ August Entries to: Terry Brown, 6, Everest Drive, BlackpooFlY2 . 9DP. everyone’s coming see you there !! JUMPER STRUT MAIN UPHAUL HEADBOARD THE BACKSTAY AL TUBE MAST ANATOMY OF THE RADIO CONTROLLED YACHT LUFF TAPE FORESTAY (or leech) (hook on mast jockstay) BATTENS BOWSIE FOR STAY TENSION KICKING STRAP TACK ACK JIBT BOWSIED SHEET ADJUSTER < [oe JIB RACK RUDDER SERVO TILLER PUSH ROD SHEET FAIRLEAD TILLER JIB SHEET SHROUD (to hounds) SHROUD PLATE SPADE RUDDER MAST STEP FIN SHEETING * \ LINE DRUM ON/OFF SWITCH CRYSTAL SWITCHER = bo 36 ‘1 CHARGING SOCKET HARVEY'S BOAT YARD is proud to announce the launch of _ “CHALLENGE 87” the boat which 23! work long, on 6” and develop hree ct is to a model =| tor chance a 2 the alternative kit will HFM MARINE, 5 Brinsmead Road, Knighton, “590” fo get you in Lo radio sailing Leicester LE2 3WD. Trident XV" ocean cacing trimaran Phone (0533) day 558414, eve 884172 NEW NEWNEW NEWNEWNEW RAM SFELERE ###4#4¥¢ A LOW-TECH EM te+e4s4 Experience at the 1984 and 1985 Model Sngineering Exhibitions indicated that there was a materials. large Ian Cole idea of working than the Apart from wood of semi-finished offers the other obvious the and assembling a kit uas cost! The cailed so mother nature's own uni-directional and «lass using 'low from component a ready tech! yachtsmen who 352 plywood hulls, that and stiffness the kevlar a hull anrarent over with all glass, potential model comprising become indeed with the assembled liked parts the rather moulded glass hull construction from items. it - of be ‘Woodstock and advantages one which could seemed, completing from simplicity, plywood it hulls working on in comcept other for A proportion, watched and demand of chine even a carbon ‘ly hull mouldinzs, compares hi-tech construction methods; even carbon low density here they fiore. a‘e not A wood nly used very is, hull in apart can well after all, compete conjunction with a low density material in sandwich construction.Flexibility, not of the hull itself, but of a design's evolution is far greater than with any methods which involve moulding. There moulds and the time lag is no vast investment of time cr effort in plugs and vetween lines fairing to test sailing can be reduced considerably. ANAGRAM to is, handle will be able although effort It is is, the them there is scope exnended panel forward on that a for manner bulkhead, of 5.5lbs of Either parts fin, chine like improvement details. xit hard lead transom, and Most on total dependent cotiprise 'NO SECRET' predecessor. » 12.5lbs on conventional will rudder, its [IkII how or the much swint m-.jor »sunels deck etc and even Cole anc Colin expected builders displacement extra rics is can time be and used. machined an to ensily jig/stand. time prevaring a seven to achieve at least strength assembled effect, a straight intenJed shape, At in in a of writing, prototype. :t 97 Redbarn Carbon lor news Craft, of its alias Ian performance and the xit Koad, Brightlingsea CO7 OSL, Tel 0205 302739. Myers, are price, contact INTERNATIONAL REGATTAS 1987. for o inf e mor e vid pro can I and me, d che rea e hav nts eve ing low fol Details of the anyone seriously interested in attending them, 11/12 APRIL 18/20 APRIL 2/4 MAY 24/31 MAY 28/30 MAY M class and 10 rater regatta at the intended venue for the IMYRU world championships in 1986. Marseille M class regatta organised by the local club affiliated to Berlin the FFMN and Naviga. 10 rater championships for Francel FFV] Possibly not open to foreigners!!! , ers rat 10 h wit rts Sta t. boa of s sse cla all for a att reg ee ngs fga Angers Wol and last four days will be 'M’ class. Salzberg, Austria. s rie ent no y tel ini Def . nce Fra for a att reg al ion nat ss cla M k kir Dun ing to get from outside the country as over 200 will be try a sail from inside France. 6/8 JUNE 7/8 JUNE 27/28 19/25 1/8 8/15 JUNE JULY AUGUST AUGUST 24/30 AUGUST s low fol ch whi y, man Ger t wes th sou in a att reg ss cla M n tei uns Tra weekend after Wolfgangsee!! Rotterdam M class international regatta. Antwerp M class international regatta. Denbosch IMYRU European M class championships. Goteborg IMYRU World 10 rater championships. ful der won in ort res y ida hol ful uti bea in k wee l sai ss cla M Champex but expensive Switzerland! two r ove a att reg ss cla M h wit ing ish fin k wee e rac l ful A k NewYor y ned Ken h bot r nea is ue Ven . led sai o als ers rat 10 s. day and LaGuardia airports,on Long. Island, and lake is ata the m fro ce tan dis i Tax or . Bus on gt in sh Wa t Por led cal place 25 ! !!! airports OCTOBER Denbosch M class international regatta. e tim the by as att reg nch Fre and man Ger all of nt pri te ple com a e I will also hav !! ys! ida Hol py Hap ly. Ita in ers oth ly sib pos and s, thi you read | ODDS & ENDS FOR SALE HIGHLANDER HEARTBEAT s plu ls sai of set One . ing igg t,r mas t, las bal al ern Int l; hul ss A cla odd sails; registered. £45.00 and der Rud b, Bul d Lea , Fin e, blu ht lig l Hul . ign des k toc Ban M class drawing. All new, not assembled £35.00 George Smith MICKEYFINN DIKDIK DECEPTION 10 RATER CATAMARAN Almondsbury 612315. .00 3 suits of sails, registered with association. £75 Keith Evans, Weybridge[ 0932] 45615. io rad No ts. mas and ls sai of ts sui 2 . per Dra f Geo by ign des ss cla M offers around £50.00 Terry Davis 01-987-7679 io. £85.00 3 suits of panelled sails. Turquoise hull.No Rad734 } 64826 Brian Sheldrake Readingl0 te Klug 10r'155' new design 2 masts and booms. Detachable lead. Whi hull. LOA 155cm. Robbe winch no sails. ls Klug Hera. 1.77m long, 1.02m beam 1.25sq m sail area. Orange hul 2 sets sails. Klug winch{13 kg pull] Both boats as new, can be delivered England, 20-979717. Joop Van Dyk. Holland, ANJA XVB New hull for this Lupart M class boat, in carbonkevlar with deck in kevlar. Building plans available. Phone for details!1 The Editor MYN, 382 07372-49365. 33 Yorke Gardens Reigate RH2 9HQ England Tel: (07372) 49365 Following the great success of French boats at Fleetwood there have been more enquiries for information. A complete list of material available direct from me for readers who can more easily contact or pay in U.K. currency follow:- SUBSCRIPTION TO MODELE REDUIT DE BATEAU. 12 issues in the year. Direct mail. U.K. price £27.50. CEDAR 4 The well established Lucas "M" boat, be built in wood. Plan well represented at Fleetwood, full of construction information. and intended to Price £7.50 CEDAR CLUB The M design used by Lucas at Fleetwood to place second behind Jahan. Intended to be built in kevlar as light hull weight is key to performance of the original. Not for Price £7.50 beginners! MINI-CEDAR A l-metre class design by Lucas. Adopted by FFMN as a one-design suited to home construction in balsa, detail on construction ideas for ply or even foam-plastic. newcomers. Price in France, but Plan contains total £7.50 DARE DARE 10 rater design by Paul Lucas which placed high at the last Worlds provided an excellent and elegant boat since. JET 7.3 kg, in Dunkirk and has 131 cm L.W.L. Price £7.50 SERVICES 1/12 scale catamaran, sheets showing HULLS. CLUB I have full GRP scaled from original, construction details. hulls Price for the catamaran and MINI-CEDAR hulls on request with hulls around in 5' long. Plan on two £12.50 stock and can obtain CEDAR (UK only). Please ring me 4, CEDAR to discuss price and delivery. DESIGN SERVICE The following plans are available through M.Y.N. each including U.K. suitable postage, Unless otherwise and are dye-line prints showing full noted they are £5 size sections etc. for home building. TWISTER A double-chine high performance design by noted Australian designer Adrian Brewer. Plans cover alternatives for the American 36/600 Moderate displacement to allow for radio weight. and continental Price 1 metre rule. £5.00 RM"1000" Now well-known on the U.K. club meeting circuit, and established as an easy~to~sail but fast yacht. A GRP hull, fin and rudder is available from E.L. Jones. Price £5.00 NO The SECRET famous and highly (infamous) successful, Bantock boat in all its detail! but not for beginners. Used to place 3rd at Fleetwood, Price £10.00 FRENCH CONNECTION A modern lightweight chine boat for home builders by the well-known Frenchman Michel Lahure. A low-cost boat for the newcomer which performs well. Price £5.00 YACHTS LEE OLIVER TORNADO (i A highly TRACER. competitive racing Kevlar construction. conventional keel 8.2 lb. construction and sail or hull swing rigs. Supplied installed, ; in any lb. f stage of with radio sail accepted as one of the most reliable and Supplied in kit form from bare hull to completely finished yact with radio and sail \ j winch installed. \ / / | / =—- PRONTO | Another championship winning design. | Supplied in kit form to any stage of Glass fibre or Kevlar hull and deck. | ~ I,_ construction from bare hull shell to completed yacht, ready to sail oH \ —_ TRACER ae RM i PRONTO Send S.A.E. Lead competitive RMs on the market G.R.P. hull and deck. Sailing weight approximately 141b. // = 12.7 which for the past nine years has been / / weight to completed yacht to the A direct descendant of the World famous TRAPPER / ; form or ready from iN\ TRACER A in kit developed Available with Sailing from bare hull winch Marblehead, for full The Old details > , R36 Maltings Quay Burnham on Crouch CMO 8AS Essex England Tel. 0621 782305