Model Yachting News: Issue 38 – September 1989

Be seeee Model Editor: Chris Jackson Yachting Reale Riz oH. News fe] Tear) a0s06 SEPTEMBER 1989. Opinion seems to be sharply divided over the space given in MYN to technical articles, but I felt the one in this issue form Dave Hollom on the subject of computer aided design to be written in a manner that modellers of less academic interest will be able to follow it without difficulty. It is obviously important that MYN continues to offer publication opportunities for material that would not be acceptable in a glossy magazine of more general interest. The next issue will cover the European M class championships in Italy, reflection on the design aspects of the last UK nationals. and a SUBSCRIPTIONS. NEW SUBSCRIPTIONS run from March 1989 to December 1989 inclusive, four issues. The rate is now: £8.50 post paid UK. £9.00 post paid Europe. £10.00 post Back I Other Countries. Issues; have full out. paid All sets of These will copy for all now cost individual 1988 issues in stock, £6.00 as a set, all post previous issues being sold paid UK and Europe, and £1.50 per issues. Please make cheques payable to Model Yachting News, and if your bank does not have a London Branch add 25% to cover extra bank costs. USA readers who are AMYA members have a special deal which remains a 20$ bill for the 1989 year. COVER PHOTO. Mike Kemp sent plans of me the cover photo of Peter Holme’s FIRECRACKER, F-1000 designed by Charles Detriche, the UK scene if The appeal of and the first of built from the many to appear on sales of plans are anything to go by!!! the boat to a wide range of modellers is mention its semi-scale Fireball looks as a major factor interesting, in because many the decision to buy the plan. This particular example was very well built, performance has been equally impressive. and fitted out, and the resultant More details on page 25. News In Brier WEILS DISEASE – A WARNING!!! This disease is caused by bacteria which rats. Nearly half of time or but another, the rats in although constantly being voided in agricultural river In does not Model the kidneys of infected by the disease at seem to harm them, the animals yachtsmen users of in are at some the bacteria are into water or onto some damp risk in sites where rats are the same way as prevalent such as banks or lakes. be mistaken they it workers or other its early stages can this country are the urine of non-acid medium such as mud. live and multiply may have the disease has many of for been it. Any one who exposed to rat the characteristics of develops flu contaminated Jike symptoms and surroundings should jaundice, who and thinks inform their doctor. With has the mild winter risen cuts or and warm summer dramatically, so you scratches, or through GIPPING VALLEY [IPSWICH] I hear pit, If that a should the be thin population in some areas of aware mucous of the risks membranes of lining the UK infection the nose through or mouth. MYC. very active club has formed in this area, useing a local gravel sailing Imetre, 36R and some M class in a membership of 45. you live IP6 8HF, in the area contact or ring ABEL MARBLEHEAD tel; fittings, fin, you want a rudder and rig you have a with carbon mast All Baker, 13 Primrose Way, for Needham Market, Ipswich more details. PRICES. is now available keel Pat 0449 722426 The new Osprey If the rat spar, at in carbon lead is choice of £143.00 fibre, priced and with deck at film, hull £167, 00. conventional, shroudless, or swing, all to £155.00 according to taste!!! Tony’s prices now include VAT. RULES IN PRACTICE —BRYAN WILLIS. I assumed your you would be able local difficulty. East book shop or If yacht so you can Sussex BN3 2FA. to get this book, chandlery, order direct but reviewed in the last edition, via clearly some people have had to Fernhurst Price is £6.95 plus 50p post Books, 31 Church in UK, add a bit Road, more Hove, for other countries KIWI I MAGIC!!! published a drawing in MYN 35, the real shape of the photos and details and over shape. area 1600 sq.in of Builder to of last page and which I took to be an educated guess at America’s Cup challenger. a model sail From New Zealand based on the same boat, area which Murray Bloxham of 1250sq.in 18, it is claimed Wellington, registering it as a is 10 with 60″ w/l. I have had 251b disp, is much nearer the real considering reducing the sail Rater A VIDEO FOR CHRISTMAS? New readers may not know that of the 1988 the only lengthy video currently available is 10 rater world championships held in Gothenberg, This is available direct from I.M. Y.R.U. on payment Sweden. of £15.00 including postage; send to K.E. ROBERTS Secretary, IMYRU, 51 Edinburgh Drive, Prenton, Birkenhead, MerseysideL43 ORJ. The video runs 40 mins and covers available in VHS format. four A fleet races at the event, and is Two shots taken at beautifully built this year’s Fleetwood Vane A class race, and fitted out boat sailed by Ray Baker of the and Vic Bellerson. The class rule encourages the efforts made here close to the deck, giving maximum sail and some endplate effect from the deck. to bring the sails down area within the measured triangle ODDS & ENDS FOR SALE. RM ANAGRAM Bantock design, installed. with 5 Swing rigs. Complete boat at winch and rudder servo, 40meg radio top level of quality standards. Offers around £490.00 to E Crockford, RM TRACER Lee design, with all order. RM TORNADO 3 swing rigs all Bantock sails, radio gear and winch/servo, red hull, white deck, winch/servo. Offers circa Mike Golding’s boat, with crystals, servo and winch. Mike Golding, Southend on RM RM1000_ Draper design, very light, hull Norwich area. Kevlar hull, 27meg r/c. Offers around £400.00 to B.Evans, Lee design, RM TEMPEST 0508 50039. All C/F spars, in excellent Appledore Devon, 3 Bantock swingrigs, 03272-71150 all radio and £300 to T. Lance, 0273 453689 Shoreham, Sussex 5 rigs, all top condition, radio 27meg, all Offers around £500.00 please! ! Sea, 0702 466694. made in New Zealand, moulded deck, useing foam with cloth skin, 3 masts, spars and sails all Bantock. All in bits, not having been built up because of vintage boats. Offers; Russell Potts, 01-850—-6805. Eltham London Area. RM AIXTRA New Phillippe Sol design, UK. Lightweight scratch!! RM ANJAXVB state of the art From the Editor hulls if you want or P.J.Sails in stock im IMPALA Complete boat, including in Poole, Dorset. with topsuit, 01-720-0010 As advertised in last ready to sail, apply in Germany. bantock new Low Profile winch, George Morris, R36RTAXACHUN or H. Piel in to build from Superb carbon/kevlar hull/deck mouldings available form stock, to the Editor in UK, Im CYGNET hulls now available in Kevlar, fittings, and all radio gear, offers around £250.00 to; Clapham London area. edition without a phone number!! excluding radio gear. 3 rigs, Ted Croxson 0734-692942 Reading Tony Abel design, complete with 3 rigs, all r/c gear 27meg. Offers around £230, N. Woodwell, Lymington, 0590 22179 P) SAILS IM & M IM hulls now in stock kits from £99. Fittings & Rig kits, IM,M,10R Swing rig PEKABE S.A.E kits, CF masts & tube stockist, full range for details 1 Courtenay Dorset. Road, Poole. BH14 OHD. Computer Aided 54, Wilmer Drive, HOLLOM Were eens DENG Heaton, Yacht Design Yacht and Boat Designers In the last few years many software packages have come on the market to aid the process of yacht design. They can, in general, be divided into design systems and systems which theoretically analyse and predict a designs performance. During the last proper America’s Cup Challenge we used a number of programs which fell into the analysis and prediction category. The principle ones were Dr George Gadds wavemaking resistance program which very accurately predicted wavemaking resistance and which, by using iteratively, gave s very good insight into the factors which reduce wavemaking resistance, SPARV program programs with tank accepts were, the is that or the at which “predicts answers to wind-tunnel limitations that learning time, process, problems of such limited, little hand which analysis, had to be taken off tedious analysed and it and system, analysis Such a system considers always The possible boat produce, the one it is just produce the options that the ultimate does not a given at and the It gains is the over the a fully quite everything system, time been to enlarge important as benefits business the 6800 bit chip of one on a speed of the design system an external which of Atari are to not and is a 16 16 bit speeds up bit be ST good for so needs. graphics IBM and chip, rapid 32 bit used on a are internal in early PCs. with 640Kfor 6 the PC, a my its is, the real didn’t to most develop son, had of In if ST has some order full being good a has slow and Motorola a to the 8 graphics screen and with is the compared also for our computer whilst helps It were high resolution which the system. comparatively It one design required chip, show computer choice Mega class to not. is to able into Spectrum. PCs, of track the analysis Andrew, one number that decided with Cup will had can sensibly the campaigns they one designs the is boat. and and one though they are graphics, time one it of provided if The time, that along of By comparison the Atari external be one compatible design as If quick number purchased. tedium. more timescale, life design America’s if it was started was the design and Good time based, best greater one given are class in is Thus, Cup a and realised. ideal the already a particular Mega internal memory compared do that that than based, system which are not brilliant. chip which to moment America’s Cup amount computer produced and given the that, but , any one will contest. two then the expect were required. in that system developed. them own to computer never designs, America’s operation and system to the be reduction of is next computer being, our the to account plans for and programs into processes have was therefore, work,in real wanted to machines,are graphics megabytes were use, next finite more last designs the say by a do the tailored the of faster been,or working the integrated, time of had own work ability systems do be for for Both these further unreasonable boats those will the not required than knows design lines designs given an analysis looked boat about follows, can be boat. of that plans, achieved done various resulting At be the research of can fact one drawn to never provided taking of Aerospace quickly seemed, besides is more and competition It the integrated, easy of the advantage fully merits compress therefore, number and any to hand. performance that time, by relative change, performance for very much information, large design the best hand advantages then available. in compares the that quick of improve than that a ultimate produces knowledge can to to use a was has a number the difficult British drag. The advantage of such the design process, the plans when that received Owing meant became obvious that are induced programs. faster by and and which speeds produced consuming lift and the 4 software ===DHOOLIC, TY Ss Vx = 8.0157 Vy = 0.0737 Section: 8 @ ANDREW HOLLOM 19¢9 FLACCID © Ay File ¥=-8,0855 Modify Calculate ¥= 6.1125 SOFTWARE solution. [eu Define General =DHOGLIC UTX . Y= 4 Ux = 4.6157 Vy = 0.8737 Section: 8 Plan options Double sided body plan Drad reference waterline (Y |e Cs ay Draw reference girths Mee (ee Connect vertices | | Mesh resolution (Long. |[Trans.[ Both |Tnee 56 Humber of stations 20 Buttock/waterline spacing 6,125 Cy] development and the running of large programs. As most of the work {t is required to do is number crunching, a maths co- processor just about triples the speed of operation of an already fast computer. All times quoted, however, are without the co-processor. All programs are written in Prospero Pro-Pascal which further speeds the running of programs. Another advantage of the Atari is that it uses the GEM windowing environment which utilises drop down menus and windows together with a mouse controlled cursor. Using this system the operation of the computer is easy. No more trying to remember which key controls what function. All you need do is move the cursor to the appropriate menu headline and a menu appears. Move the cursor down to the appropriate part of the menu, click the mouse and a window appears the contents of which are self explanatory. The design program ’HULLDES’ works using a Bezier surface which is manipulated using sets of vetices or control points. These control points form sections which run around the hull at some distance from it. Each set of control points consists of any number of vertices, up to 16, which can each be manipulated individually in any of the three axis. In addition, the entire set of vertices can be number of moved, of the system as sections boat is to The up a the membrane is to imagine the of as a held pulling whole boat slight change one 4-5-are by but to the 16, also each points pulling thus alter rather as entire normally only of can be the stiff the length of that the the surface of that it If vertex of that spline, if it it the is in easy shape. with the The effect does one weight on a of imagine together but side take then the whole hull. the always you now surface, length one will points, Any visualise the surface to hold shape of the movement so control that bit of near used along hull would do. against the fore and aft. The easiest way to forming is vertex is strongest over to held by weights, elastic, and but adequate. point and you pull slightly, up membrane elastic slpine, surface, any is direction vertices, flexible contro! on any control surrounding of normally membrane curve in any sets imagine a boat. fair unit, or but the Pull a change spline other the causes weights a are relaxed. Because the whole surface changes it does mean that the whole surface remains fair, in all directions, with every change. By iteratively moving control points, surface mesh, the the desired shape resolution of to recalculate and reproduce change, at low but at low and at resolution numbers in the emerge, exactly what over the new one wants. The to shape high Although of a the surface for is the the 99, the same within the waterline interval. Likewise length, those the spacing of defined as final after Thus, each works the desired shape the of arriving surface mesh display is the traditional sections can be selected up outside automatically being buttocks a one stages defined by by takes about 3 screen then, and this mesh can, if desired, be displayed, the normal one of sections, waterlines_and buttocks. The number of to is resolution. design and resolution surface The computer on a minute at high early stages change produced. which can be changed. seconds resolution, is and waterlines spaced at also be can changed. The stage program in the targets includes design one mere 27 the boat with one to be being appearing seconds. other process, set,are seconds before the on facility the Additionally, scaled axis. boats At low screen. there totally or, All calculate calculations met. the to is can hydrostatics be checked resolution high resolution a full scaling start out with a the ensure of or, unity which in so at each that,the operation function independently length that, the calculations At in each axis to so take 10 takes a allows conjunction that the whole boat is first scaled to achieve the desired LOA or LWL. Then any dimension may be scaled, either independently, or with one other. Thus, for example, beam and draft can be scaled, leaving length constant or, beam can be scaled, leaving File Hodify : X=-0,0285 Plan = ¥ = 0.1155 Define General SDHOOLIC VIXE= V=4 Ux = 8.0157 == Vy = 0.0737 Upright hydrostatics 18,362 2.787 8.758 4.451 8.497 43.153 2,463 14,862 8.552 3.217 Lwl Bul Fnid B/T Cmid = Cup Cvol Cwsa Ch BUt 9.008 2,022 8.624 3.255 6,639 8.723 3,387 8.124 8,353 1.383 Lref T Fap D/T LCF LCB LCA CB Section: 8 = length and hull draft constant. Alternatively,ratios,such as B/Tc or L/B, may be selected and changed, as with the other scaling functions, by merely selecting the change required from the menu and keying displacement and stability just Changes such as screen and are useful for getting the the on instantly almost appear these in the new figure. right. could it Typically,a design can take as little as an hour to produce but well even all day, to get it exactly as you want it with all the or several, take it numbers correct to three decimal places and the shape just right . Although to design a boat by hand ina day, to do all the calculations and possible is then to iteratively change it until the shape and all the numbers are exactly as you want them could take a week or more. Most of us give up before then and than we had sought to achieve. Others are probably something less settle for happy to arrive at something like their target displacement. Once the design has been finalised it can be analysed dynamically and its performance predicted in various wind strengths, using our own performance prediction program, ‘RESLIFT’. This program gets most of it’s information directly from the data stored in the ’HULLDES’ program and only needs such information as the sail area, keei and rudder geometry, the speeds yaw and heel angles, the windspeeds and the VCG inputing in order to do a full analysis. Input is via a series of windows called up from the menu which then only needs the relevant data typing against each question. In the case of VCG the ’HULLDES’ program works out the surface area and VCG of the hull and deck and all that needs inputing is the weight per unit area of these items plus the weight and VCG of all other items of equipment. When the ‘RESLIFT’ program is run all this information is used to produce a full theoretical tank test of the design, the output showing upright resistance and heeled and yawed resistance, for each of the selected conditions, plus a full VMG prediction for the windspeeds selected. The tank test takes 20 seconds to run and the Vmg about 5 minutes for each windspeed Whilst selected. this is the main program we do use others that Andrew has written. *BULBDES’ and ’WINGDES’ work on the same Bezier principle and are used to design, as the names suggest, bulbs and glider wing sections as well as fin and rudder sections for yachts. The ’WINGDES’ program is used in conjunction with the ’PROFILE’ program which analyses the two dimensional wing or keel sections produced using the ’WINGDES’ program. It is a potential flow program coupled with a boundary layer program and the output shows the geometry of the together with the velocity distribution around it, a lift drag polar and showing the lift curve slope, the transition from laminar to turbulent surfaces, the separation at the trailing edge and the pitching moment. gives a full print out of the velocity distribution, the drag for each and at the a x and time and surface, as not, however, a to be the size. antil to 14 the angles of to take account into of clues program The Girsberger in Given then the 505 It will attack and is extremely glider time he out a useful performance to drag 5 the the boundary laminar and up stars Reynolds output layer of such a bubble has been responsible sections were all both mode! 10 good at the but does operating for most this doubt section seems quite It does designed using will section is full for F3B competition gliders design a the and section no numbers condition it under normal in recent years, a graph on both It also surface for separation bubble. to eliminate Selig and Eppler AH21 if the additional help work also numbers the formation of which will G15, have Andrew’s foil. Reynolds conducive This foil. of attack and improvements program as dinghy up number conditions. of ordinates angle of such give y foil and his for Marbleheads low Reynolds numbers we 505 but work 11 at. The program was originally written to run on a mainframe computer and takes 20 minutes to run on the Atari without a maths co-processor. Future improvements to the programs include a full heeled and trimmed option on the “HULLDES’~ program. It will then be re-compiled to run on an Atari Transputer Workstation. at which time a 3D perspective viewing option and colour shading to show incorporated. calculations It is the It will will hoped, initially software house in then, for curvature throughout the surface be very much more rapid and will changes be and instantaneous. those to run on the near of. of course, be’ almost that program, degree any who are Atari interested, ST computer, will future. JN «File Modify Calculate Plan Define YT DHOHLIC AN File Modify Calculate Plan Define HOBLIC VT a version of @Uttti-t?! be the available ’HULLDES’ from a 2:8 Model No. Symbol 1 2:6 2:4 2-2 x 2 ep ° 3 rs 4 8 10 4 14 oO 13 5 B A Y 2:0 YY ‘ © Measured total = resistance 1:4 1:2 J 1:0 J 0:8 gif 2 Calculated 7 wavemaking 0:6 Se SS a v, 4 Jo 0: i 7 Full scale FIG. 1 CURVES 8 speed resistance a , knots 9 OF RESISTANCE COEFFICIENT 13 MULTIHULLS Response to my comments in the last of the trimaran have been all some control over the sort of in issue of favour of MYN and the publication of some immediate decision multihulls which may or may not a photo to organise be built in the UK over this winter. A general agreement to limit size to something around that and also utilise M class rigs has led to the adoption of FORMULA Length overall Beam overall Height All of [ max] only that [ max] MULTIHULL. 1.75m [measured from deck to top of have a great mainsail cats, proa, trimaran etc configurations allowed, stays within the above overall Dave Stone has started work on a new design, existing boat, the following rule 1.5m outriggers, the boat the existing boat 1.5m rig [max] foils, 15 of provided size limits based on experience with the and of course on the knowledge developed by the French fleet, deal of experience in this class. who He has been aided by others including Andrew McCullough , known for his M class boats before he set off round the world, and also some advice from a fullsize trimaran designer Details of this design, course as a kit of MYN, which it is intended will of hull, floats and beams, will which will also contain details of manage to sort it out when we visit be made available in due be presented in a french boat Paris at the next ChantierCO2 if edition we the end of September. FRENCH INTEREST. The rule adopted above is rather smaller than the 2m class as the name suggests produces boats of considered, on the grounds that too big to become popular, size of The is water WILL partly because of required for these boats Some boats appeared at proposed class, length overall. in France which This size was a shared size would be sensible, in France a class known as CT, details. that used boat size, but rejected as and partly because the is rare in England but I have been unable Autun and appear so one hopes for French interet to around to find out the the same size as our in this new class. IT WORK?? As I have sailed my boat at a number of venues this year, a lot of interest has been expressed. It is entirely up to those people who said ” I rather fancy one of those” If I to build them and sail hear of during them enough boats being built, 1990 for them, and of then I will try to arrange a regatta course you would be welcome in France at their events!!! WORLD INTEREST? A fleet of multihulls sails in San Diego, expressed by a club in Queensland, remember they are first 36″ length, and some Australiain building some. the tiller of my boat to a holiday visitor might go ahead after he returns home. Just of and foremost 14 from those parts, fun boats!!!! I interest was recently offered and he thought they The Dave Stone built trimaran I class working rig on three Jet to form the An end plate french floats. on to experiment UK recently, but Service hulls at No ballast the rudder with of have now been sailing all weight boat ideas. no one reports I on keel, below, summer, 1/12th scale, total typical of weight the with M two cut under down 5kg. willingness of have also seen some on m class boats improved performance!!! the in Model Yachting Association Affiliared to the I.M.Y.R.U., C.C.P.R. (Water Recreation Division) and R.Y.A. PATRON: H.R.H. THE PRINCE PHILIP, DUKE OF EDINBURGH, K.G. PRESIDENT: N.D. HATFIELD, ESQ. I hope that you will indulge me if, in this my penultimate article for the magazine, I refrain from the usual reporting of the Council’s business and write instead of the recent Vane A Class Championship at Fleetwood: You will be aware that the MYA has the only viable fleet of these boats left in tbe world and that once a year they gather at Fleetwood or Gosport for the British Open A Class Championship. Time was when we would have seen many entries from abroad to supplement the English fleet. Nowadays the only “overseas” competitor tends to be Hughie Shields of Scotland, of whom more later. This does not mean however tbat the race has diminshed in importance within the MYA. Far from it. A total of 30 boats entered this year’s competition, each brought along a mate (of two) to assist and most brought along wives, children and/or girlfriends, and prayed that they could keep them apart. In all about 150 people were involved in one way or another with what is a unique event in the model yachting calendar. Unique, you ask? Well, yes it is just that. Other competitions may last for a week, but entry is restricted to those having a serious chance of winning. Other competitions may attract more entries, but how many of these allow young people (some under 10 years of age), the chance to gain an introduction to the sport in this way? Other events may feature close finishes, but how many have dead-heats and a final result dependant upon the last leeward leg of the very last race? Other events may feature some older boats, but in how many competitions have you sailed where the winning boat was 10 years old? These are just a few facets that made this race a source of joy and delight to those who took part this year. Perhaps the most unique thing of all is that the race has many other competitions going on within the main race and that all have a chance of some sort Of prize at the end. Not the least of these being the Yachting Monthly cuP Knockout where anything can happen and nearly always does. Besides being the only competition of also the most enjoyable sailing I, it’s type that I know of, it is and many others have participated in. Peter Maskell. Chairman. 26, Woodhall Croft, Pudsey. Leeds. W. Yorks. LS28 7TU. ies Telephone 0532 577522. 16 Anyway, to be as fun-packed, brief as possible, competitive everyone week’s racing and, concerned had a glorious, being a generous would love to share this occasion with more of There is no shortage of hulls available. you we 1990 at Gosport. New boats from the Bantock and Hollom boards are available to supplement those Simpson, in lot, of Dicks, Lewis, Stollery and Sykes/Butler which have appeared in recent, not so recent, years. If you I and have ever been to an A Class Championship then you will know what am talking about. If not yourself the opportunity to experience a unique then why not give occasion. In the famous and oft used phrase ot Walter Jones – “See you on the starting line” – I hope so. To return to our friend Hughie Shields, mark Hughie’s 28th. our “overseas” competitor. consecutive appearance at the A Class, the Association presented him with an engraved decanter as a token of esteem and friendship. appreciated. You may any event then it To it’s Seldom has any award been more deserved and think that if someone can make 28 appearances at must have something rather special. You would be right. MYA CLUBS IN THE SOUTH WEST. As newcomers we found a frequently telephone MYN to ask review of some of which appeared in for details of the less wellknown the Woodspring club news of some new developments in regions not noted clubs in interest, for model clubs in their area, the south and west the more so as it yacht shows clubs. PLYMOUTH MYC. After some years in and in addition have seen, adopted it the to the doldrums, a water the club now has a new water close to Torpoint big enough for a National Championshipsl!!] shares a clubhouse and bar with the local 10Rater class the Bellander Titania, some time as well ago and have as some Graffiti football made several club. moulds, which I They one for hulls. WEYMOUTH & PORTLAND MYC. This club has created A353. for formed to use a them, or The lake will is being lake at Lodmoor Country Park, enlarged for model be finished this summer. yacht which was either racing!! No details of Just off the boats sailed. FALMOUTH MYC. There is an MYA affiliated club in Falmouth, and with a mixed good account Secretary of fleet of One Metres, themselves at M class and Plymouth is Keith Rolleston, Penryn, sailing on the seafront 10Raters, some of lake there, which gave a recently. telephone 0326 40584 for more details. EXETER MODEL CLUB. There is an established model club in Exeter sailing on the canal, having some one-meters although a visitor to it to the maritime their home water is not museum I have thought would make a nice venue for an open that suitable the stretch and certainly for of racing. river As next race!! MEVAGISSEY. There used to be an active club here some years ago, radio controlled yachts are being sailed on a lake and rumour has it that in the area. PERRANPORTH. There is a lake just off although shrouded by as well. Not My thanks this basic from you. in the town centre, substantial quite certain to Mike Evans of info. If if anyone hedges is quite big enough all round. Might for 36R boats, just take one-meters useing this lake. 2 Orleigh Close, Buckland Brewer, Bideford, Devon for readers can Mike’s phone number add to is 023 75 17 this he and 641. I would be pleased:to hear I hope this photo of black Graham Bantock’s M class reproduces well and white to show the attention given to weight enough in saving on his light weather rig. The opposite end EC12 class, four times winner of as shown of the model in yachting spectrum is the tightly controlled this pic, by Rod Carr who else!!, the U.S.A championships . of Kelly Martin, Tel:NORWICH (0603) 57754 M.J.WOODHOUSE, 12 MARSTON LANE, EATON, NORWICH, NORFOLK, NR4 6LZ ENGLAND. HI-TECH MATERIALS GLASS CLOTH 20 & 25 gms per sq metre @ £3.00 per sq yard, post free. SPECIAL 23 gms per sq metre @ CARBON £10 for 5 sq metres, post free. FIBRE CLOTH T80 gms per sq metre £30 per sq metre, post free. KEVLAR CLOTH 58 gms per Sq metre £17.50 per sq metre, post free. 36 gms per sq metre £20.50 per sq metre, CARBON FIBRE TISSUE Weight 18 germs per sq metre. post free. Approximately .005″ thick. Consists of 1″ pan based earbon fibre, very strong when applied with cellulose dope or resin. 34″ wide per yard £6.00, post free. NOTE ALL GLASS/KEVLAR/CARBON AVAILABLE IN GREATER OR LESS THAN YARD LENGTHS, PRO RATA. CARBON FIBRE TOW 0.8095 gms per metre, infinite 174″ Kilo pack, Also ideal for attaching glass, Kevlar and carbon. suitable £4.50 post 35p. CARBON For for laminating FIBRE SPAR MATERIAL Sheets 60° epoxy. 10p per metre, plus postage, length. LAMINATING EPOXY acetone. (12,000 filaments per tow) PRICE Iong x Can postal be 3 172″ wide x .035″ sawn to spar size and delivery it will need thin balsa (1.0 mm) sheet – thick. sanded smooth. to be cut down to full Thins easily with instructions included Material 78% carbon 22% Glue with slow curing epoxy. say 2 x 30″. Other multiples specify, max 36″, or collect at contests full lengths. £18 each plus £1.00 postage. Due to demand I can now supply 1/2 sheets (30″ x 3 1/2″) @ £10 each plus £1 postage. CARBON FIBRE SHEET STOCK Sheets 48″ Tong x J” wide x .008″ (0.2 mm) thick Sheets 48″ long x 2″ wide x .016″ (0.4 mm) thick Ideal for reinforcing balsa or spruce spars, braces, etc.; consists of 50/50 carbon/epoxy. £9.00 each plus £1.00 postage. PUTRUDED CARBON FIBRE ROD 050″ x 36″ @ £5.50 each plus 50p postage -070″ x 36″ @ £6.50 each plus 50p postage -125″ x 24″ @ £7.50 each plus 50p postage I AM TRYING TO EXTEND THE RANGE OF ITEMS SOLD. THE ABOVE IS ONLY AN EXTRACT. ANY SUGGESTIONS FOR ADDITIONS PLEASE OR IF YOU KNOW WHERE I CAN OBTAIN SUITABLE ITEMS PLEASE ADVISE! OVERSEAS MINIMUM ORDER £5 PLUS 15% POSTAGE PAYMENT BY DRAFT ON U.K.BANK. YOUR I OWN CURRENCY, am getting a PLEASE INCLUDE ADDITIONAL SUM TO COVER U.K. lot of queries and questions nowadays, I will IF PAID IN BANK CHARGES. try to answer every- body. However, please remember to enclose a stamped addressed envelope or reply coupon. Also I am not a shop. However, if you wish to call for bits and pieces whilst passing through Norwich you will be welcome. The list is always being amended so keep in touch for new items and price changes ete:- In the event of price changes or currency problems I will adjust the quantities supplied to agree with the payment. 20 a 4 y , B 4 A T Y y o ° s z uwttpogPTyeurgwsow Spw4PeoTa;dOyseMu[wagq}yQT0atyg9 LOo0°°*9SESZebbt p 4 o s w T a y g O ‘ aTp zA P40F#4I049 Tp,[OsoFamAmtzugNyAt4pauye4} Lo0O°*°ZT9Lé8Drvb ayzyIxStyayBzubryustnqgueguo yTes1p8a4yuo0 oo°*SZ0oIsS uY4mOzo408Nya}xs3SsaaTttegmM o00°7ZséE98tS aYU42Sz0AW08NA0SqagTemM 00°°644899 AHOIONML 3Y039S oO°st B°zr v*St oS v8 cxX 8Ix 9SX £LX TZLX 62X £6 2S éS vS Ss 2°e8 v”SB v°Lé Z° OT a°zor O°SZT 66 TZ zs es 65 2SX ve se 9S LE 8: 62 Ov Tt cy bridged. permitted. notch line is that not only “bow bustles” and “bow bulbs” whether hollows — ~~ J — disregarded when establishing the natural line of the profile. profile but “local” = created The by “bow chins”, deciding such factor features will is one. The “Vapour Trail” and “Alien” designs (as presented on the drawings) are not found to contravene rule 5 as the hollows in the profile are not considered to be local. Mélndal 89-07-04 Jeep” Jan Dej IMYRU Technical The Tecnicnl class rules Committee intp Measurement A and My task to appoint to the a act been line with IM, 10 Rater is Chairman has Instructions achieved with the Committee and 1 Metre class as the charged with the task of revising IYRU standard and format based on Standard Class Rules. This has and class rules. Work is ECl2 all the already about to IMYRU IYRU been start with rules. secretary sub-committee for the and 10 Rater Class Rule work with them to produce Revision; a draft that is, rule which meets both the requirements of the TC ( i.e. it must conform to the IYRU standard and format, has no ambiguous wording, and no ‘loopholes’ etc) AND the requirements of those who build and race 10 Raters (whatever they may be). When acceptable to both for groups, the draft rule will proposed to the Permanent Committee of IMYRU adoption. Ideally the 10 Rater has something The revision i.e. hollows Rules positive will have Revision to contribute to tackle in the hull Please ask anyone revision, who is willing sub-committee to some profile, treatment of yachts which would may affect every member of your be be sail that should contain everyone who revision. difficult problems area measurement, in the current and perhaps rules, the not conform to the revised rules. This revision national authority who owns a 10 Rater. and able to comment on and contribute to the to contact me by 26th August at the latest hen a sub-committee will appointed. Yours sincerely, OOO From: Graham Bantock, 141 High Street, Kelvedon, Essex, England. CO5 9AA. Tel/Fax 0376 71437 aon 4A 28 RECOGNISED BY THE INTERNATIONAL MODEL YACHT RACING UNION THE TECHNICAL COMMITTEE 89-07-10 Mélndal TEC AN LT € Art C OM ML Ta.E-2 RS PO RT EC 12M CLASS. The rules are now being printed and will hopefully be distributed in week 28. Rod Carr has done a very good job and we now have class rules that are well presented and of high technical quality. “A” CLASSES. A decision has been made on the requested by the interpretation Model Yachting Association and a copy is included. The interpretation shows that a class rule amendment is necessary as the rules require the measurer to establish things that can be almest impossible to do accurately. The TC has decided to establish a sub-committee that will re-write the class rules to IYRU standard and format based on the IYRU Measurement Instructions and Standard Class Rules, and should at the same time consider the class measurement problems. Bob Sterne, class secretary, will propose members. 10 RATER CLASSES. The class secretary, Graham Bantock, has been asked to propose members to a 10 Rater sub-committee which task will be to re-write the class rules to IYRU standard and format and to consider class measurement problems. As I expect that the Six Metre Rules will be dropped, we are now revising matters in the last order for class rules an and will IYRU Model then have Yacht Racing technical Division. ONE METER CLASS. Roger Stollery has completed the Measurement Form and it can hopefully be distributed with the EC 12m Rules. 1:10 12 METRE YACHTS. The Technical Committee has set up a sub-committee to find out whether there is an interest in writing common rules to make it possible to race the yachts that are other. built in However, different member the interest when now new rules will The sub-committe SAIL NUMBERS. be chairman The for used countries such a for the against class may have America’s is Alain Hieronimus, Technical Committee is each Cup decreased challenges. France. presently considering possible systems to make these workable (readable on the water). The discussions include the possiblility to use jib numbers (with or without mainsail numbers) and to use competitor numbers instaed of registration numbers. mentioning that it would be would not suggest amendments technical matters without Committee first. Committee Chairman this context it may be worth good if the Racing Rules Committee in the racing rules that effects discussing Jan Dejmo Technical In the matter with the Technical seUenIyS\IAormT[gBO[*“S‘zslauqouyQjTBMAvpENq943UdO“J83ZpYRI}He TVNOILVNUSLNI .V SVIO NILVOSV JYupAoTst}jydIeUz[ianBmhND pBy3dOuTWmwxIeaoAFjvRsATsB[yUre}otqSjzuINnO JpidLYZ39VWBRM0XDuajT“se(on°tU€y[O)N =.SqyouUAOIYeTBasJdm,V}NDtgP3‘xR8z4¥nvFMr A*JaSn8sB19iy/5I U*TmeOdSxq S“usUtLTyOpNJaVI{nAoWwe[UY/BTxSIaCpsOeVUy}AoNuZ42TaFDSes03P&BCHUmOTZNpYoeud}[EB0q3SJLO|‘zyeuT®sSVFNQj} YeButriy30D*9e T,psMUauUO81-qOnFs032xq4JlTd9eu40of‘.VS¥zyryDom}R{NISY“A’YeH}I3BEsRBdmM1jUOAp NisSUupJOy3T8eBHIAYZ}DqLn ‘’tM]QoKRaz spa[IS9BenQTyYoqVzOi.MAZ4pPH3YJs2g0yISuTONAQ9}omeRBqdlh [“tijzv S3|TJp‘B9sOyA_uE8YHQeUaNRIZoD eU‘wyOqPR|AaHr” pusyTauy STUL7e0q STY4yJ‘auotyTensmo{apuesSimoTOD|y*‘s4ajoid T‘pr8IatMesqAQoUeTqzyoZuduI1d4Ws‘e03}0nHpuoeSQO]MOtsqia‘uzoey~zTeWTI0SSJsE Ot}dTsYyo‘aUqu 8edTIpsyt}Jm‘eanig oCPc©eraSmsn., S‘AiTnNoJY0IzEZ 3‘s1uBey oe AsHinda?g OOAaqvI3IQH91TLvOsWu§loa}NwdyNJVeWQo-O]‘dS-q-|S‘ZaOrsOi.wDsT9u/}eE||YGIWNan}dYOdIML$&Ayeg geuasrcne | pSEIL8 aysiAu‘|N“JdegUoTSEn$ waq ‘p,usyeoaqjnildg}w QU‘PYpOay*lGsMjIZAe|Ddi}9 | | | | | | | | | | | @ wwe 2aS e° ° wus . | | | | | Yoljtsewg eucqgio> ° eseg fersuesesyip ys doy Auew fq pazdos pue ‘aayzyrayyje fF *yB0oq sseT2 we uo S8uy3373 @T43S Yyouery BYyy Jo ynodeT TE ‘auzzeSeuw ayy 03 yues A,[qQuUaDe1 ueTd @ WoO1Y SzDB1}zxO BIE ¢ *PT4OM pue ayy puNo ue sia dd EY a“S%G1jMYpsBPeJuZIoUxi0lAyd’OW4N)}ngTRD eo BeO918SNIWod-{VBu‘avempy08$ 1MOUS’NA Né l 1BJ“UONEW9M}I | | — sneydoroy WoIsOp -e8snog sOP1E 4 ue 3ysTT 40g ma1OU 84} TAL BIZ 6PE GO9E WSJpN:aIeOUEYsL}] SOB ssgiunor—- p4o2204 #0q I1JNOA9FYD MoYys Bupaeip ssayL INILLTIA HONSAYS esjojuog €€ éSNUTAa391BLvOK(20)seDI C”IeSOiBNvHoUOlONuAVASTaNHuIAUOGnHUs6VD 1dSNW IANS “i age NI4A0qXNEgaOp1L3GouaTIX2RgsTvl[WOz4AedaoSsv4td1suOH8-qYVA‘H7waYuD4Deyd6“YD‘ty8epzY4TdWknuO+yodr0trNpBL>4jp.m2UajSTO91m;3qnp@TVE8soJ1SuE80x8mg‘[*B[}sLeuQ{OeiyB[y]4pqye;dUpo4uus~qaO0pweW19zfn}soP8Tq“YzTNuto0uB,yOm4EY>‘1Us;s([‘I[)&GMsvanpjtwMkfASduSeJnX4uyH]esx@Z4ytjomzP*saeaFwme83opXp;Up8Se;|NB04;BAus429R0‘p7~4Te;ouuyuUFrag38lOD,O‘p‘8qsuaY“z[pGo8IZyed*ansMf{syqzFoe&@us9BxUS‘etO“s4Twd7Tu0eW1TTUA2NGa@BQyqWBpTuuW[0yoA_e9n4[gyp1s®8e’®OS4yg32}2JsSf{4nuJTsjUIyqdgolBfM8AmMo4Z4aue‘zFze34OaiY]}8yF7LITngNe,e0yWFzq09}°G‘GLp04)pUuO2T E‘GfNLV3VIHDOINOASYZSHNBY3YUGOHHSV6D 8″09GF4d uJtAeNsfmOzHadiWpgyS8 Teda.in3,9s[1m04anok‘suw[TIny eqpjoBuTting‘MoYs89F41q‘W0 EATA V “TSHaNSVA LAr “SAOTANSES 89F4g ‘WIF OL Ssy4I(“Z97e4“ptQjs[/1uITrM/q6LyOgOeG@NB]fG[ATZFo¢gJs)SpwasXNA#TBTUzuOYpSB4e8’uDo0Ums1W~RnjS,}HawdY‘ig‘yza240y8j;‘2uO3wAes408]_WfB01[f;.JqteNgMwmenovsDpguaxz@g1aFmvy{ywTpot[01oQMy8!e9pysbu8(Fe43W[j1ssWqnAGNnusq1s;U‘00yBl“}4B(Dua‘dOTodTMompyamy_ozzp[“yynd7[neNne;4n48qsYUe1;wes“uBfpsF8fMOi0}avuDJa9Ozy10ups_upd‘AyteSco‘deuy‘mmoyTAow]oJjNpFYdy3YaBSrzWE®UL[Y9nnB[4qTO”Hpanu1p4s0sy¥uq’}mQ“yeA44pevy=@VlZ;yjoY8TMFnfm,f8Lo4o}9ImdamgFST@4J‘“88g2d‘JeM4IWU’p‘*B*[Ln4uOoLuFa¥6-Gql2geOSOu09GSsq”eu#dso4’y7s ] e l u c t ‘ . 7 t w g , i z B _ v a w t q i [ T e B u y n q ‘ } e y p 8 9 } 4 d T F O L Y N O d V A “ 1 a L s e p o u ; f u p y e J a m i g y p o igcuvyEpesUTO{anJdo1y;Y4ze‘uUTMBow4ZsYyn,dSTeU8OFtszap[uoQgyETNsS4eUOBD[@IMJFTEIAZOTSJae4nezouwuq}toynUpey usy‘U.np#woY40zaqm8ude]s[SnT’My[e0qysuSTLp>AeTsmUyoOe0nqoy‘Ez!24fGB(aIp8xm91z‘)St[}eEu,oa(B;x@“yEVUFTW‘yLJre”mgTo@UOFgsf4GTg(8*2Wl2Ho‘ZOrI1uF]ny0“s Tony ABEL MODEL RACING YACHTS MODEL YACHT KITS ‘HIGHNOON’ – ELECTRONIC SAILWINCHES PETERSFINGER ROAD SALISBURY SP5 3BY (0722) 24677 Designed & Moulded by Tony Abel 1 MTR CYGNET £129.95 R36R KIW! £114.50 RM OSPREY £186.00 R10R FLAMINGO £161.00 All kits are complete with G/F Hull, Keel and Rudder, Panelled Sails, Black Alloy Mast, Chrome Fittings and Lead Bulb. MINI WINCH £38.00 TR8 £69.00 SPRINT pea 2 TR8 COMPETITION WINCH £65. 0O Futuba Radio Controlled equipment from a complete set to crystals. Telephone or send large sae for illustrated lists. 36