Model Yachting News: Issue 25 – June 1986

33 Yorke Gardens a 49365 Editor: Chris Jackson Mode htwisng YaNce Tel: (07372) JUNE This issue will contain the draft questionnaire for the Marblehead class review. coincidence this the 86 development is the over issue the By immediately after the one containing a long article on last few years of the class in the U.K. Having waited so long for this questionnaire I hope readers will feel it is worth publishing in full so that everyone interested in the class can see the proposals that have been put forward,and not rely on biased reports. ERRATA In the article on readers were able Heat to work to understand,pages COVER A systems 36 out and 38 the what printed pages were happened, but in unfortunately case this made transposed the Several artic] difficult should be reversed. PIC. scene from the recent A team race with a Clockwork Orange Peel, at Witton Lake, Birmingham. Reporter sails Clive Hartland’s Revolution. Peter Picture by Lock Tan Cook.| NOTICE The Data 1984. Protection Register To comply with this was established on llth November law I am advising all readers that list their names and addresses on a personal computer scriptions after March to access COPY this 1985, file. it relevant is my Payment 1986 will be taken as acceptance by the under an Act of intention to of new sub- individual of my right information. DATES Please note that MYN goes to the printers on the first day of the month of copy should reach me Subscriptions result the 3/4 weeks beforehand from JUNE 1986 cover 7 subscription rate is: issue and if at all possible. issues up to DECEMBER 1987, post paid inclusive. Asa U.K. post paid EUROPE post paid ALL OTHER COUNTRIES This will move the renewal date in future to a winter one and allow more time to sort the paperwork out. Some previous year’s copies Make cheques or OVERSEAS this is Giro or SUBSCRIBERS. impossible add (numbers money orders Please remit 21-24) payable are available to Model cheques drawn on in sets at £4 per Yachting a bank set, News. with a LONDON braneh, If 25% extra for bank charges. Please note that the editor produces this magazine as a spare time occupation, Telephone calls to talk about model yachts are always welcome, but I am only at home tn the evenings and weekends. (Except when satling!) mmyru INTERNATIONAL MODEL YACHT RACING UNION jimy RU> NEW_MEMBER We welcome Finland into membership of the Union. Their National Authority is the Finnish Model Boat Federation and their correspondent is:- Bernt Paqvalen, Kavallvagen 36, 02700 Grankulla, Finland. NEW SECRETARY Canadian Model Yachting Association:- Norman Patt, M.D., 25, Tanbark Crescent, Don Mills, M3B 1N7, Canada. REGIONAL AND WORLD CHAMPIONSHIPS HOLLAND intend to apply to host the next European RM Championship in July, 1987. Further details will be announced in the next issue. AUSTRALIA will host the next EC12m World Championship at Pizzy Park, Gold Coast, Queensland, 90 km south of Brisbane, from 8th/11th January, 1987, inclusive. The 0.0.D. will be Steve Crewes. Entries to David Black, Secretary Queensland MBA, 11 Patwin Street, Oxley 4075, Queensland. Copies of the up-to-date EC12m rules are available from IMYRU. It should be noted that three suits of sails are allowed — two full-size sets and one storm set. CANADA would like to host a World Championship for R10rs and the”Canada Cup”, possibly in 1987 if the Swedish MSF do not proceed with their offer, otherwise they would have to wait until 1992, because 1988 has been booked for BERLIN and SPAIN has applied for a World Championship for RMs and R10rs in 1990 in Las Palmas, Canaries. GENERAL MEETING As previously notified, this will be held at the North Euston Hotel, Fleetwood, on Friday, 18th July, at 6 p.m. Norman Hatfield, Chairman. SOLARKRAFT ACKHURST ROAD, CHORLEY. LANCS., Manufacturer & Supplier of RM SEAHORSE Mk 4 RM SEA URCHIN Mk 2 ENGLAND :- RM SEA SCORPION R36R SEA DOLPHIN Mk2 All the yachts listed above are avatlable ready to sail. Our new mylar aerodynamic satls and hyfil masts ensure a winning combination. SOLARKRAFT DESIGNS MORE HEAT RACING SYSTEMS THE FRENCH GRILL-HAZARD SYSTEM I first watched this sytem at Viry-Chattillion. in use in Paris for the championships held for Apparently the French had discovered the prob!°m of Stollery system in that the A fleat is soon roughly formed and most of sailors stay with their same competition people like to have The Grill divided so a interested chance Hazard This can result in friction and a in degree of disinterest sailing only against from time to time of by putting all the names in a normal rules apply After one round for all At scores first sight simulate the chance of more The the system system and form found that but this is lower the fleets where same quality but rounds with This can the entry be by computer, or 2 for second etc.,and the retirement. to new fleets by random This principle unfair, 30 but boats competitor continues at the sail least 7 French rounds once. system for all its used each They not a major problem unless you Chelmsford club adopted this very if in A fleet where the selection for all the race, result. appears very sailing every other than others the in (hazard). the boats are re-allocated to the other the hest. eg x for first place, disqualification or are added the hasic hat. regardless of their previous performance. the in boats of system answers this problem by sailing races score the same points, and sailing into equal numbers by random selection simply All fleet. is always fierce, are not the TM class club a computer they have of course will keep meeting races last to a 98% meet some Jahan! year, and find it successful. For club racing, the following points can be made 1) No preparation of 2) If people don’t arrive in its favour:- schedules before the day. then it doesn’t matter, whereas in a tournament schedule this causes problems. 3) The actual entry can be divided into 8 or 9, or any suitable number for suitable the day. sized No more fleets easily, 3 boat i.@. races because 3} of fleets of retire- ments. 4) Scoring for every race is separate and protests do not hold up the next round. This system has been adopted by IMYRU as the wood, to be followed by the fleet system. year’s Dunkirk International meeting. one can 1) The the 2) say first part of This idea was its racing sucessfully formation of system at used at the Fleet- last In its favour for an international gathering that:- sailors will large penalty have in the a chance fleet to get used to local system of a drop to a The judges can get familiar with the fleet conditions without lower size and suffering fleet for a mistake. reaction to protest situations and make their views knoin. 3) There perfect is a very good perhaps, minimum but (80 boats 4) No delays in 5) The Scoring if chance the in two days wind is good is so in If have you previous three the entry on fleets of and fifth and the previous the same 11 or other. 12 Not races basis results available (subject only to unresolved protests). into equal fleets and then moves boats according to their first from fleets. six boats round as each then for the next round, the the and third and second fourth finishers from each race sixth together. By this means it follows that from expect simple that the organisation can have full each race are put together together, everyone can each SYSTEM system divides result sailors to meet sailing whilst protests are heard. “ITALIAN” This then all in all). within seconds of the round finishing AN for in the second and only one can win above as long as racing round one again! fleet So continues. the consists of boats are the top boats again exchanged So far so good, and I believe this is the same idea that Chris Dicks has been using, However, the Italians use a with our English points system and penalty turns. different scoring system, Place: Score: 2 3 1 ie) 3 5.7 4 8 viz:- 5 10 8 u 6 21.7 A334 12 18 a a 10 16 9 15) What’s more the penalty system involves the race judges writing down but not calling “Contact” and judging who was at fault while everyone sails on. At the end of a race the penalty decisions are given to the scorer who adds places on the basis: One protest (without argument) = 3 places down One protest (with argument) = 5 places down It’s possible to have more than one penalty against you in any race and so you could easily finish first but be scored for say 1 + 3 + 5 in that race because you have two protests, one of which you argue was not your fault, but you still lost. Thsi system was used at Wolfgangsee in 1986 and there we had the good fortune to have good judges such as Kukula, Walicki, Voelz, Lupart and Ftzel, all good and experienced Without such people I feel skippers would argue at the end of a race that sailors. they did not have a protest situation in the race because it was not instantly identified by the race observer/judge. The system also calls upon the judges to decide fault. Both the systems depend on the ability of yachts to switch radio frequency from time I to time, but this is not in practice as big a problem as some people think. personally feel strongly about travelling at some expense to a meeting only to find that the organisers made out a tournament schedule too early, and then because of non-arrivals and retirements and the use of the standard 6 boat race computer schedule, we end up with a few races, some with only three or four boats. INTERNATIONAL MODEL YACHT RACING UNION APPENDIX TO THE 1985-88 INTERNATIONAL YACHT RACING RULES Do you know that we have in stock a good quantity of the Appendix in the English Language. If you need some contact either Ken Roberts or Chris Jackson for a price which will vary with quantity and postage charges. Prices start at 30p for single copies! Supplies of this attractive sticker are held in stock by the secretary and publicity officer. limy RU> Priced at 35p each or 3 for proceeds Union’s go to International fund the events, £1.00 plus postage, work supervising rules and other work. Send a cheque, International Money Order or postal order in favour K E ROBERTS of IMYRU to:- (Secretary) or C JACKSON (Publicity) 51 EDINBURGH DRIVE 33 YORKE GARDENS PRENTON, REIGATE BIRKENHEAD MERSEYSIDE L43 OJR RH2 9HQ LETTERS TO THE EDITOR Re Issue 23, I would like to comment on John Osborn’s item on the racing rules. John states that,when re-rounding a mark after touching it,”The hidden gem is that while doing the 360 penalty you won’t have to keep clear of the mark”. A gem indeed, only two slight errors: there is no 360 penalty, and you Do have to keep clear!!! Rule 52.2(a) states that when a yacht touches a mark she may exonerate herself by (and from here I will take the procedure item by item (i) Completing the rounding of the mark….. If a yacht does NOT touch the mark, she “completes the rounding” when she leaves the mark astern on a course for the next mark (this is the point at which the Rules governing mark-rounding cease to apply). Surely,then, a yacht which has infringed the Rules by touching the mark must “complete the rounding” at the same point- an infringement does not confer special benefits!!! (1i) Leaving it on the required side….. st whil and ke, t,li righ it ses pas and k bac s goe er e,y sid ng wro the ‘its If yer doing so you are at liberty to vent your spite on the wretched buoy by hitting it as many times as you like until you reach the point at which you “complete the rounding”, i.e.you are heading down the track to the next mark (iii) and thereafter re-rounding or re-passing it without touching it After “completing the rounding” i.e. pointing towards the next mark from the correct side of the buoy, you must go back and do it right!!! This is not a 360 penalty turn, it is the required rounding manoeuvre-a touch invalidates the rounding manoeuvre, so during this rounding, the buoy must NOT !!! be touched! The only case where a 360 penalty is involved for a ‘touch’ is when a mark is not surrounded by navigable water, a most unusual case for radio yachting, I would think. Rule 52.2(a) does not specify a 360 penalty, it specifies that the mark must be rounded without touching. This involves a 360 turn round the mark, admittedly, but it is not a 360 penalty!!! If you don’t think this is worthy of publication-I do, but then I’m predudicedperhaps you would pass it to John Osborn, who may care to write a nasty letter in reply? As a OOD, I’d disqulify him if he tried to pull this on me! Minor comment on Vic Cooney’s first brain teaser: Assuming different point scores for DNS and DNF, does a yacht which ranks as a starter (your yacht with the dented transom, e.g.) but does not START (same yacht), score DNS or DNF? NORMAN LORIMER man Nor m fro rd hea t jus e hav I !! er! Und n Dow m fro s new Hot s!! Stop the presse 2 BC1 the for hip ons mpi Cha ld Wor a d nte gra n bee has lia tra Aus t Hatfi-ld tha ly ate edi imm y, uar Jan in d, lan ens Que se, adi Par ‘s fer Sur r nea Class, to be held the er, wat sh fre is e lak The e). sit e sam the (at als ion Nat n lia tra Aus after the l ica typ and s ini bik st lle sma s ld’ wor the h wit ort res y area is a popular holida summer temperature around 30 C thats 86 F f!! ne sba Bri ey, Oxl , eet Str win Pat 11 of ck, Bla id Dav is nt eve the Secretary for ut abo on ati orm inf g tin wan one any m fro r hea to e lov ld wou 4075, Queensland, who ional Authorities in the very near the event. He is circulating details to Nat . day ter yes e her d ve ri ar y onl RU IMY om fr ion mat fir con future 12, (EC als ion Nat the er ent to ts ch ya ned loa be ly ab ob pr ld cou Visiting skippers see to th Per to ss ro ac p tri a on ts gh si r ei th e hav o als RA, RM, R10r), and would 5000km!! the America’s Cup yachts-it’s only about NORMAN LORIMER LETTERS TO THE EDITOR 1 May 1986 Although this letter is addressed to the Editor of this magazine, it should more probably be addressed to every model yachtsman in the United Kingdom. As most of you will Know, South Africa’s invitation to participate in the World Championships has been withdrawn as a result of action by the Permanent Committee. The South Africa Cup has been withdrawn and an appeal parties to provide an alternative Cup. is being made to other Whatever you may think of the rights and wrongs of what has already taken place, we would like you to consider the history of the South Africa Cup and, in fact, model yachting generally. South Africa has been a Keen promoter of model yachting since 1936, later joining the IMYRU in 1948. Many of you may have memories of events held at the Durban Model Yacht Club, as many of us have certainly formed lasting friendships with those of you whom we have been lucky enough to visit or have had the privilege of receiving as quests. The South Africa Cup was donated to the IMYRU some ten years ago in the spirit of encouraging the pursuit of radio-controlled model yachting, and enhancing the prestige of the sport internationally. It is the only Cup that has so far been sailed for by the RM Class, and has to date, been won twice by an Englishman and once by a Canadian. These three races represent a fair passage of time since, as you all Know, World Championships do not take place every year. Replacement of this Cup by a different Cup will diminish the prestige achieved by previous winners. We in South Africa see it as an act of great bureaucratic pettiness. What do you think? Yours Write and let faithfully, us Know. GEOFF MUNDY President MODEL WACHT ASSOCIATION SOUTH OF AFRICE PRESIDENT:- Geoffrey B. Mundy P.O. Box 112, SECRETARY:- Michael S. Latham TELEPHONE: National (031) 961548: International +27 31961548 Winkle Spruit 4145, REPUBLIC OF SOUTH AFRICA Read with interest the letter and article on pros and cons of Fleet Sailing for RC yachts in issue no.24. which handicaps the cannot another are think of equal, but really relevant, skippers. Arguments interuance As far as systems. less some The comments on And agree with Mike Hounsell skilled or sport are more than sorting competitors I fleet possible I a car shall basis, leave that is avoid Already race under a a the to competitiveness of feeling not open big seems sailing be their a case of yacht. “all I skippers others”! the other rabbits doesn’t sailing policy or this in system into categories so that one can possible win personally prefer Racing against for skipper with problems working on equal about the unfairness of a that really events handicap really someone trying to outsail teach one a is trying to better lot. sell you a required. which (me) use fleet without rather having GERRY isn’t than schedule extras added on. HOOPER life ® 4 ie As VA /) YA INTERNATIONAL A CLASS YACHT a DESIGNED BY FRANK RUSSELL With this design I have attempted to develop as much form stability as possible, without going for an excessively wide waterline beam. heel, comes from a high transverse metacentre, moment of inertia. Stability at the result of a Righting moment at larger angles of of the increased beam of the hull above the waterline. in the A class, Marbleheads. The large waterplane This waterplane fullness has been achieved by taking a considerable quarter beam length penalty. unusual low angles of heel, is a result The flared hull shape and is more often seen in modern, successful is 10 raters and increase in righting moment at larger angles due to this shape, is in the order of 4% over a conventionally tumblehomed version. However this shape with its sharper deck edge, does suffer a slight sitic drag. freeboard minimum. but To allow for this to some extent, The most significant disadvantage I would expect heat shrink deck, is the forwar increase in para- has been kept to a increased deck area, lightweight construction techniques to be adopted, or at least, including a lightweight glass or thin ply. The quarter beam length penalty has some interesting rating effects. yachts that have the same measured length and displacement: line, 53.1″ (135cm), Yacht B has a (132.3cm). and carries a length penalty, longer waterline, 55″ (139.7cm) calculated from the waterline length, heeled sailing 1014.5 square length, inches carries (6545 1079.1 sq.cm.), greater than the measure The a significant sail fin is section, and inverted taper. near inches (6962 sq.cm.), 52.1″ and only one half longer actual to Yacht B’s inches (417 sq.cm.). sail area carried by yachts is about 30% square required for the sail area, and Keels of this planform have a higher less abrupt. the the cause of is the QBL is (4.8cm) the difference becomes 84 the minimum area make any stalling which (137.2cm). The displacement penalty is a difference of 64.6 square than do keels of conventional taper. fin, and no OBL penalty, 54″ inches (542 sq. amount. keel (CL) area, is and not the measured length, square Comparing two Yacht A has a short water- the OBL Yacht A despite having a 1.9″ When it is considered that the actual cm.), i.e. Both yachts have the same displacement. of the QBL excess is taxed. and weight, has a 12% lift coefficient The change in chord length also tends to The square section keel bulb restricts tip loss from the high drag coefficient (CD) that inverted keels usually suffer. The square section bolb has several advantages over a circular alternative, on shallow draught boats; down low. particularly yachts which carry a large amount of ballast The bulb is very compact and has a low centre of gravity, shape increases the span of the fin, and its aspect ratio. fin and what the bolb develop allows the total the same as a suited. wetted area to be reduced to about fin and circular bulb. The yacht’s shape allows a hull to be A good quality, woven types this compact The combined lift of the Most model yachts these days are constructed from fibreglass, well when used that lifted from a one piece mould. closely woven glass cloth should be used, leave voids in the crowfoot weave glass called CE200V, laminate. which Suitable resins can come from any of the polyester, due to a good 5oz/sq.yd. layers of this material will produce a very light and epoxy being preferred, and not one of the In Australia is about to which this design is (170 g/sq.m). strong hull vinylester, its excellent mechanical cloth to loosely use is a Two at minimum cost. or epoxy group, properties, with and adhesion. Its longer pot life also allows more time for excess resin to be removed from the laminate. Alternately a hull can be planked in either 3/16″ is heavier, but stronger. One layer of 240z (4.8mm) (85g) balsa, or foam; the balsa woven glass each side in epoxy should be sufficient. Complete lines, sheet, for 2256 NSW, sections, $12.00, appendages and including postage Australia. sailplan details are available on one large from: Frank Russell, 25 Britannia Street, UMINA G3NDIS30 A@ isv1ivq ‘M9 WV3d 9 7 6 HI6LO W6c6w4EI4a9S9¢-E-d-29L11 4qUUlIl14Le8Ey–|-€v4SE2 9Wu-6sw€|> dSId — chairman’s column MODEL YACHTING ASSOCIATION – COUNCIL MEETING, 10th May, 1986 There was a fairly lengthy agenda for the second statutory Council meeting of the year, which was attended by 17 members out of a possible 20. RADIO FREQUENCY POLICY The Radio Secretary, David Blundell, gave an up-to-date progress report establishment of the 40 MHz band for the use of surface models. on the Although the DTI had made a firm offer of 30 spots with 10 Ke spacing, no communication had been received from the Department since March and the band has yet to be legalised for use, consequently there has been no press release. Although no formal frequencies to prospective users has been made, allocation of the JRCUC recommends that powerboat owners should concentrate on the top end of the band and yacht owners on the bottom end. Some retailers already have the new sets in stock but it is advisable to wait until the band is legalised before purchasing, likely to come down later. Meanwhile, especially as the cost of sets is of course, the 27 MHz band may continue to be used and will no doubt remain in use for some years yet, for CB radio, but it will be legalised although we are unlikely to be concerned about increased interference since it has never really proved to be a problem. SAILBOAT ’86 EXHIBITION AT CRYSTAL PALACE Held over the weekend of 8th/9th March, the MYA was allocated 400 sq.ft. of floor space and the RYA expected us to take advantage of what proved to be a prime site for our stand. Our Exhibitions Secretary, Graham Bantock, devoted 700 man hours on the preparation of our exhibit and it was an impressive display, with a feature showing the development of the demonstrations, 10 Rater class, examples of all the other classes, plus a continuous showing of video films and two sessions of match and fleet racing on the pool with commentary by Jim Saltonstall, the RYA Chief Coach. The Show was opened by HRH Prince Andrew and our Chairman was introduced to him and he spoke to David Coode and Vic Bellerson while watching demonstrations of sailing in which he expressed much interest. We tried to persuade him to take a transmitter but he declined to do so. AGM DINNER As there had been no response Dinner outside London, to present from clubs to the suggestion of linking the AGM with a Council felt that the organisation of such a function appeared too many problems, so it was decided not to purshe the idea further. RMs_ AT LONDON DOCKLANDS It was confirmed that the Chelmsford RYC will organise an open event for RMs at a suitable site in the Docklands on Sunday, 28th September. The S.E. Region of the Sports Council has offered £5/600 for publicity in the locality and entry details will be sent to clubs as soon as an inspection of the Docks has been made to find the best operating area. MEMBERSHIP The Treasurer reported that 59 clubs had paid their affiliation fees to date, 4 new clubs and leaving 5 clubs still to pay. including Since the introduction of the Year Book, clubs generally have paid their fees much earlier than previously and 38 clubs had paid before 1st February and a further 13 before 1st March. The new clubs affiliated this year are:CAMBRIDGE MBC Secretary: Bruce Lindsay, Roy Curtis, 12 Church Close, 4 Parkstone Parade, Cottenham, Cambs. Parkstone Road, CB4 4SL HASTINGS MYC uv : Hastings, HUDDERSFIELD SC ” Sussex, TN S : John Senior, 5 St. Mary’s Way, Netherthone“Haaderstdetas Yorks, SHEFFIELD SHIP MS n : A. Lees, 10 HD7 62 Norton Lees Crescent, Sheffield, S8 8SR 2xS IMYRU_GENERAL MEETING The MYA General Secretary, Russell Potts, England at this meeting and, was appointed the official delegate for after considering all the items on the agenda, Council instructed him to vote according to their decisions. M CLASS RULES REVISION At the time of writing, a draft of the Questionnaire had been received by members of the IMYRU Rating Rules Committee. It is understood that an amended version will be sent to all countries as soon as possible, with notification of the date deadline for its completion and return to the Chairman of the Committee. RM WORLD CHAMPIONSHIP The proprietors of the “Yachting World” magazine have agreed to donate a trophy for this event to replace the “South Africa Cup”. It was reported that there will be a full complement of race officials and helpers at Fleetwood and all 84 places have been filled by competitors from 20 countries. NATIONAL CHAMPIONSHIPS – Venues and dates, RA Birmingham R10r Woodspring RM Guildford R36 ~=Danson Race of Champions 1987 where available, are as follows:- 26/27 September A (date to be notified) 23/25 May Fleetwood 2/7 August 10r Gosport M Fleetwood (to be confirmed) Leicester (date to be notified) (to be confirmed) 2/4 May 6m Bournville 36 Birkenhead (date to be notified) (29/31 August) A Team Birmingham 4/5 April M Team Bournville (date to be notified) Little Portugal Cup Leeds ( ” TEAM TROPHY FOR RM NATIONALS Council agreed to a suggestion that there should be a trophy for randomly selected teams of three in the RM Nationals, on the same lines as the “Tots Trophy” for the A Class Championship. The cost will be met by “Model Yachting News” and will be first competed for next year, RACE OF CHAMPIONS Agreement was reached on the future conduct of this event. There will be a maxim um of 16 entries, comprised of the following competitors:- The current Champion Winners of the RM District Championships Winners of the National RC Class Championships 1 5 4 The balance from the top results of the RM National 6 ROYAL GARDEN PARTY The Chairman reported that the Association had agair rece ived an invitation from HRH The Duke of Edinburgh to send representatives to the Royal Garden Party this year but, unfortunately, the date in July clashes with the World Champion ship week. However, our Treasurer, Tim de Buriatte and Ken Jones, who has been associated with model yachting for 57 years and served on the MYA Council for 9 years, gladl y accepted the invitation and will attend with their wives. YEAR BOOK CORRECTIONS The following open events were omitted from the Year Book in error:10th August Red Rum Trophy RM Cleveland 17th August Holland Jones Cup R10r Poole 14th September Laidlaw Dickson Cup RA Poole Entries for the Poole events to their Sailing Sec: R. Halstead, Poole, 4a Sandbanks Road, Dorset, BH14 8AQ Noman Hatfield, Chairman, i ) RM nats Squire Kay was a well-deserved winner of this year’s RM Nationals, held at Fleetwood over the Easter bank holiday. The competition was, if anything, even keener than usual with places in the the Worlds at stake. Squire sailed superbly consistently, coming 2nd on Saturday then lst on Sunday and Monday. However, the closeness of the scores for the first four places show what a tight battle it was. THE BOATS: no doubt about it, light boats are de rigeur this year if you want to mix it with the best. Objectively, the difference in performance was probably not very great, but it was all the best skippers needed to give then an edge over the rest. The carbon-fibre NoSecrets of Bantock and Cole consistently sailed away from almost everything else, whilst the Stollery’s Bees were uncatchable downwind in the Fleetwood chop. Light boats come expensive and the implied trend towards cheque-book performance is bound to be worrying to those who think the sport should be intrinsically cheap; however if you are serious enough – and good enough – to be in the running for a national championship, that 0.5% performance edge mist be worth the price. If you area back marker, it won’t turn you into a hotshot overnight. THE FLEET SYSTEM: no subject is more guaranteed to raise the blood pressure of the average model-yachtsman than the pros and cons of fleet sailing. However, a straw poll conducted by Dereck Priestley indicated that the majority of people were pretty happy with the system. Three days’ racing seemed to iron out the iniquities that most people seem to associate with feet sailing: the best people stayed in A fleet; if you were consistently in C fleet, it was Probably because you deserved to be there. THE RACING: with conditions varying from almost a drifter to a full Fleetwood blow, the quality of racing remained remarkably high throughout. One A fleet race ended with seven boats crossing the line within one boat’s length. A start-line terminating in a stake on the leeward bank frequently led to much ducking and diving as the whole fleet on starboard tack piled into the bank right after the start; however this resulted in very few incidents or protests, a mark of the generally high level of tactical and helming skill. Finally, thanks and congratualtions are due to Dereck Priestley for OOD’ing such an enjoyable and well-run event; it bodes well for the Worlds in July. MARTIN MICKLEBURGH 1 SKIPPER S. KAY CLUB ASHTON POINTS 2321 SKIPPER 31. J. STONE CLUB WOODSPRING PTS 327 2. G. CHEIMSFORD 25.8 32. I. HALL CLEVELAND 328 3. R. STOLLERY GUILDFORD 32.8 33. A. CHEETHAM DONCASTER 329 4. I. CHELMSFORD 35.4 34. M. BIRKENHEAD 336 5. C. DICKS CLAPHAM 47 35. M. KEMP DOVECOTE 343 6. 7. J. R. CHEIMSFORD INVERLEITH 75.7 83.7 36. 36. DONCASTER 358 BOURNEVILLE 358 8. 9. P. STOLLERY M. BEILBY GUILDFORD 90.4 W. AUSTRALIA 94.8 36. K. CLEMENT 39. A. MCCULLOCH CLEVELAND DOVECOTE 358 360 10. R. LECHIE INVERLEITH 99.7 40. A. LLOYD FLEETWOOD 387 ii. 12. 13. 14. 15. 16. 17. J.. D. J. R. B. M. L. CLEAVE ANDREWS BROOKS SMITH CHEETHAM WILLIAMSON SMITH RYDE LEICESTER FLEETWOOD LEICESTER DONCASTER CROSBY LEICESTER 111 111.4 116 141 146 148 149 41. 42. 43. 44. 45. 46. 47. P. A. D. M. H. M. J. EDWARDS NICHOLSON COODE EWART JACOBS COLYER WHEILDON CHELMSFORD LEICESTER GUILDFORD DOVECOTE ASHTON LEICESTER M.Y.S.A. 391 410 441 443 475 482 488 CHELMSFORD RET BANTOCK COLE BREAKELL BROWN 18. E. ANDREWS 19. M. GOLDING LEICESTER 166.7 A. D. ROBERTS DRURY SINAR M. MacCONNEL RET 20. M. DACHOMBE 21. M. DICKS 22. T. BROWN CHELMSFORD GUILDFORD CLAPHAM FLEEIWOOD 211 218 228.4 230 M. FORSTER J. ROWLAND T. JENKINS DOVECOTE RET PLATT FIELD RET BIRKENHEAD RET 23. WOODSPRING 232 A. YOUD FLEETWOOD RET 24. M. HOULTON POOLE 238.1 D. HACKWOOD CLEVELAND RET 25. D. POTTER 26. A. SMITH BIRKENHEAD WOODSPRING 257.7 266 267 289 T. SALTONSTALL G. DODDS B. JACKSON C. JACKSON CLEVELAND CLEVELAND ASHTON CLAPHAM RET RET 29. R. CHELMSFORD 319 J. PLATT FIELD DNS C. SMITH 27. M. MICKLEBURGH DOVECOTE 28. J. TAYLOR FLEETWOOD LATHAM 30. N. ROTHWELL WOODSPRING 325 C. MYERS BIRKENHEAD LINGWOOD N. WILDER 12 DANSON RET DNS DNS JONES G.F.P. HULLS. A full range of fittings < E p e | R R.M. for vane and radto D. HOLLOM. 13 40 Ibs. for all recognised M.Y.A. classes, Bulb 10 40lbs. plus S.A.F. for full ttet of fittings Beam W.L. 50.75 in. 900 in. Designer Displacement Length O/A Beam Max. 10 72 Draught 16 20in. and hulls and new ttems. E.L. JONES. 8 Marline Avenue, Bromborough, Merseyside. L63 OJR. Tel.051°334-1969. aNes . | | MARBLEHEAD CLASS QUESTIONNAIRE The most important thing with class rules is that they are interpreted in the same way in all countries. This is unfortunately not the case in the Marblehead class and this is the reason why there is no question in this questionnaire like, "Are you satisfied with the present rules". So if you would be prepared to answer yes on a question like this, please vote on the alternatives that represent your interpretation of the present rules. But, as it has happened a lot of things during the last decade, we would like to take the opportunity to obtain views on for example new construction materials. interest of the class The questionnaire across and views in view of is mainly received based but as there Naviga to achieve common rules, There also good reasons is associations, a wish present trying to measurement and registration procedures to avoid problems types When considering stated as is the The national in the between the are and indi- covered. differences IYRU and which come the Union and differences minimize have sailmakers from both authorities be questionnaire, a development class. prohibited, design class must the all in IMYRU yachts, administer both of yachts. Marblehead one for development etc? also the for the on measurement problems we from member vidual yachtsmen, are costs Is assumed revision everything to is it must be be it should That is assumed that is not be if to kept in mind something be is not permitted, clearly stated that as the clearly while in a permitted, prohibited. based on the Remote Control Marblehead Class, but na- tional authorities that have Freesailing (Vane ) Marblehead registrations may vote marked on a nakers in If we are differently separate the to RC form. class solve for the the two classes You may for example wish and may wish measurement fresh approach to measurement as as possible when open minded wish to point consulted On the the if behalf out the of that it revision the Union, to I permit problems, techniques important be would them it and we considering is very is to and is such votes to in prohibit the FS necessary wish shall to spin- class. to make to be this questionnaire. We also that the class owners are successful. like to wish us all good luck with hilG” Jan Dejmo Officer a ask you revision? Rating Rules be 15 May 1986 TTI) The overall length (LOA) some yachts, of the hull has proved very difficult to mea- sure on per. On most modern designs hull lines, that is especially the the hull Could you therefore accept The presently permitted LOA, the maximum possible If LOA, it is mitted permitted including accepted is designed that the ding the bumper: @® yes. ® no. the stem bumper is 1 As if will bumper, of the bumper bumper, is 1289 mn. LOA the be is is inside the continuation including length the rounded a direct hull excluding to measure is including of the bumper. measured 1264 13 bum- mm, to inclu- 1276 mm. the bumper, maximum which per- interval would you prefer: (@) 1264 - 1289 m. (B) 1270 -1289 mm. (C) 1277 - 1289 mm "A" is based on the fact that there the bumper."B" would retain measurement. “Cis based on In the shall 3 United not cut States the the is no minimum length prescribed for the figure the present class rules waterline when the 50 inches (1270 mm) tolerance are of is the LOA + 6 mm. interpreted yacht in as: resting in "The the bumper water." Do you agree with this interpretation: (A)yes. (8) no It has there been proposed is no need Do you agree If a bumper ‘ip for that the bumpers bumper requirement in a remote that a bumper control should be should_not be required q should it then: as class. in the remote control Marblehead class: @ yes. ()no. is required, deleted, satisfy y the measurer. (®)be minimum 6 mm in length. ©)be minimum 13 mm in length. Some yachts have servos installed to alter the beam by remote control, but there 6 Do you want to: (A) permit alteration of the shape of the hull at all also Many or new decade means to alter the shape of a hull. series of races. construction materials or so and some are very have been introduced during the last expensive. Do you want to restrict the construction materials: @yes. @®) no. If construction materials are (A) only wood, (B)as Q other times. (8) to prohibit alteration of the shape of the hull by remote control. ©) to prohibit alteration of the shape of the hull during a race 7 are restricted, glass reinforced plastic, "A" plus kevlar would you like to permit: aluminium and foamed plastic. and carbon fibres. Which definition of tunnel hull would you prefer: (@)a tunnel hull is a hull with more than one flotation point when resting in the water. ®a tunnel hull is a hull that has any concavity of more than 6 mm below the waterline when tal and transverse to the checked with centreline Qn of a straight edge held horizonthe hull. A problem with unmanned yachts is that they can be difficult to separate after they have become entangled, unless reached by dinghy or other means. 10 Would you reduce "No hull project like to introduce the following rule in an attempt to the above mentioned problem: @ yes. @® no. fittings, outside the except side the vane of the gear in the freesailing class, shall hull." BALLAST MATERIAL Some yachts have used materials like tungsten (wolfram) to reduce the volume 11. of the ballast «(Do you want to: @) permit any ballast material. (B) prohibit ballast materials that are heavier than lead (11.3 kg/m). FIN/KEEL The following definition of movable fin/keel has been proposed: "A movable fin/keel is a fin/keel that can be adjusted in any direction or by rotation during a race or series of races." 12 can you accept this definition: @yes. ® no. 43 Would you like to add the following sentence: (A) yes. @® no. "A fin/keel that can be removed to ease transportation and can only be refitted in one position is not regarded as a movable fin/keel." 14 Do you want to prohibit fin/keels that can be articulated (e. g. fin/keel with a trim tab): @yes.@no. RUDDER 15 16 Do you want to prohibit yachts with more @ yes. ®no than one rudder fitted: Do you_want to prohibit yachts with the rudder forward of the fin/ keel: @ yes. @ no 17 Do you want to prohibit articulated rudders: @ yes. @® no. FIN/KEEL AND RUDDER MATERIALS 418 Do you want to restrict the construction materials: @ yes. (no. 49 If the construction materials should be restricted, would you pre- fer: (@)as in 8.A,(@®as in8.B. Rigs Concern has been expressed over the cost of a competitive Marblehead as the number of spars is unlimited and especially in view of the use of carbon fibre spars. 20 Do you want to permit: () only one set of spars to each rig. @®) one set of spars to each set of points 46 and 47). 21 suits of sails permitted (refer to If the number of spars is limited, do you want to permit: @ only wood, aluminium, glassreinforced plastic and carbon fibre. @®) as Watt but carbon fibre masts © any material, only with a minimum length of 3% 1300 m, 922 If the number of spars is unlimited, do you want to permit: @ only wood, aluminium and glassfibre reinforced plastic. @)as "A" plus © as "A" plus carbon fibre masts of minimum length carbon fibre. any material. (D)s. 1300 mm and carbon fibre boom Almost without exception, only triangular sails are used in the form of Cat (only mainsail) or Bermudan (mainsail and jib) rigs. 93 To simplify the measurement rules, could you accept that only triangular sail and only one jib and one mainsail should be permitted in the sail plan: @yes. ®no. The present rules prohibit bowsprits. 24 Would you agree to add to this rule: "No part of spars or rigging shall project beyond the ends of the hull including bumper." (A) yes. @®) no. Naviga has a rule: "Jib booms that may project outside the side of the hull with its forward part (counterweight, jib tensioner, etc) when the jib is rotated, are prohibited." The reason is the same as under point 10 - to avoid yachts tangling and avoid damage. If yachts collide on opposite courses, booms and fittings that rotate aft of their swiveling points will be pushed away, while booms and fittings that rotate forward of their swiveling points will catch the other yacht. Parts of rig that rotate forward of their swiveling points may also obstruct a windward yacht (which is required to keep clear) in, for example, the start, when the yachts are very close together. Revolving rigs (like the "Swing rig") ought to be considered in this context as the whole jib rigging is rotating forward of the mast. 25 Would you like to have some restrictions on the "swiveling points": @ yes. @) no. 26 If there is to be some restrictions, would you then prefer: (A) no part of a jib or a mainsail, its spars or its rigging forward of its swiveling point shall be able to project outside the side of the hull. @®) no part of a jib or a mainsail, its spars or its rigging forward of its swiveling point shall be able to project further abeam than the maximum beam of the hull. © the swiveling point for jibs and mainsails shall be fixed approximately in the centre-line of the hull. @® "a" and ton, ® "3B" and Wow, The requirement in alternative "A", and in some cases also for alternative "B", is difficult to comply with if so called "balance" jib booms (booms that have their swivel points aft of the tack) are used. The al- ternative "C" should be compared with the International Racing Rule 27. This rule prevents revolving rigs where the continuation of the main boom can be used as an outrigger in the sense of a spar enabling a sail to be set outside the hull. Outrigger is therefore only referred to as a fitting that "could exert outward pressure on a sheet", The Union has invalidated TYRR 27 in the RC Yacht Racing Rules Appendix to enable the use of "balaneed" booms and has left the decision about outrigger to be decided by each class when its class rules are revised. Do you want to permit jib luff spars set forward of the sail (head foils): @yes. ® no. Sails The principle for sail measurement is unclear in the present rules and this was clearly illustrated by the investigation that was carried out before the World Championship. The national authorities were asked if they measure the mast bend used to flatten or twist a sail. 4x 12 countries replied they that allow measure bend as 25 such shall most they a bend, The basic depends on The is the problem with are.measured on tension, are shape the . the etc is sail the when the Marblehead a sail divided is of the the in of measureon mast ~ the —_—— changes complication time result depends width Projected width further the width width unchanged A intentional projected and cloth is that the result at — mast when is bent ~~ ea. T any etc. Projected ak i also of measurement spars, clew outhaul "Cloth" that a mix-up of "Cloth" shape prescribe projected sails kicker answered that replied that they rules. rules the bend, country and no country rules the position and If 1 shows that a revision is needed, accepted modern sailmaking techniques by the ment. bend, clearly of that a round the have certain parts such luff This countries problem measurement. measure although measured. member applying not mm unmeasured be not do —_ iS the mast rules is is bent that the section of into sail is three parts. When the mast bend is altered and adjusted, not only the luff round will change but roach,although to a lesser extent. e eaei Roach Still another cannot sail Basic triangle problem with projected guarantee area will that his depend sails on how will the the uff measurement is measure, the sails are as set by that the projected yachtsman. leading model yacht sailmakers have declared that their probably not measure if rule 14 was to be applied strictly. The most sailmaker measured the round Some of sails would important criteria when devising a measurement method is the ability to repeat the result by different measurers. For obvi ous reasons, the ability to repeat the result is not very good when measuring the projection of a soft sail. The softer the sail, the lesser the accuracy. A form where of a projected sail is placed outside the cult to place sail is flattened decrease sail. and, will decrease This method flexible of luff area measurement a in Again relation the if and out, the the sail to ability three-dimensional is is sail of oloth will measuring is also as these called or straight repeat is low of not method. 5* "frame frame the by luff, its show of as to in the dealing their a foot corners, assemble incapable will so in relation tensioned a heap ropes, a to dimensions the luff measurement" lines it is flat and the very area. or diffiIf the leech will edge middle with over a rounds rounds of the sail with sail. with this A solution is to check only one measurement at a time and then tension the cloth along the line of measurement (measure along the cloth) and to measure only from edge to edge of the sail, not to lines inside or outside the sail. It may sometimes be necessary to substitute the edge of the sail where it is locally cut away. This is what sometimes is called "cloth measurement". An advantage from rating point of view, is that flat sails will not be punished compared with deep sails and the sailmaker will have the same amount of cloth at his disposal, whichever shape he prefers to give the sail. Can you accept the use of the "cloth measurement" principle as de- 28 scribed above and in the part dealing with cross measurements: A yes. In B no. olden days, depended on width was sail and with soft cotton the permitted length of approximately half less at the Fig 1 sail upper of and the lower cloth, the the battens. batten length battens. Fig 2 extension Fig See of The possible in the roach the middle fig roach of the 1. 3 Fig 4 The roach measurement was basically a check of the maximum roach in the middle of the leech. When stiffer synthetic sail cloth appeared, it became possible to use the 51 mm roach permitted over a longer distance of the leech and we now have a situation where it is possible, with stiff corner reinforcements, to make a roach that is 51 mm wide all the way from the head to the clew, (see fig 2). Some have taken this inter- pretation of roach even further as in fig 3, but can a roach really be something like a rectangular piece of cloth? Is not the roach something like a round, although it may be straight lines between the battens? Can a sail as in fig 2 or fig 3 really be called basically triangular? Let us take a look at the definition of clew in rule 8(b). The clew is the aft edge of the sail and this point is marked with and fig 3. This measns that, with a strict application the roach cannot be aft of a straight line through the arrows in fig 2 of the rules, clew and parallel to the luff (see fig 4). The foot round will be dealt with later. If cloth measurements are used to control a sail, cross widths are taken to check the roach, the basic triangle and the luff round in one measurement, instead of dividing the section into these three parts. Cross widths are taken from points on the leech found by folding the sail. The 6* half height point is found by folding the head to the clew (see fig 5) and the quarter and the three-quarter points are found by folding the clew and the head to the half height point. The folding can be done over a rod to avoid creases in the sail (all owners care about their sails). The points can also be found by measuring equal distances if the sail is attached to the spars, although this will be a slightly slower process. If marks are left on the leech at the first measuring, check measurement will be a very quick procedure. Cross measurements are taken along the cloth to the nearest point on the luff to avoid variations in mea- surement due to angular faults (see fig 6). Any hollows in the leech are bridged when measuring cross widths. —_ Half height point \ Fig 5 29 If cross widths Fig should be taken, would you like 6 them to produce a leech that: (@) could _be more or less straight between the upper and the lower battens. @®) would look more like a fair curve (Naviga and old IMYRU shape) as in fig 1. How should the the sail 30 Would you prefer: ® that the leech should not be convex between at leech the look head and between between the the upper lower batten batten and and the the aft point of clew? these points. @® that the leech should not be more than 6 mm aft of straight lines between these points. © that the maximum extension of the roach between representing "BY" is duce the a If no to the and same leech parts the a circle in are of fig as 7. in the leech Although of the and checked with International the the a pattern specified radious. a above-mentioned between three-quarter point ROUNDED FOOT should be "C" would produce fitted, the points segment procedure as battens these point Class leech and shape could pro- as in fig 8. requirements would clew and aft A the of quarter the sail apply height at point the head. OF A LOOSE-FOOTED SAIL this rule specifically talks about a "round", many sails have a rectangular or triangular foot round. A special problem when measuring the foot of a sail is that the foot can be heavily shaped. The foot can have what is sometimes called a "shelf", i.e. the foot is curved inwards when viewed from astern. shelf foot, can be head, along the The overcome cloth, to problem of by the taking measuring, fairly, a centreline middle-point of the sails measurement foot. with from a the This measurement is usually a function of the actual leech and luff lengths in classes which have a variable sail plan as in the Marblehead class. Fig 9 shows a centreline 31 measurement. Could you accept the centreline foot on a loose-footed sail method instead of to control the measuring to between the clew and the tack: (@)yes. (@)no. 32 Could you accept that 33 Would you like to "The edges of the the foot of _a loose-footed sail approximately a fair even curve: @)yes. @®) no. clew and the a depth of the straight line should be clarify "fair even curve" by the following rule: foot shall not be more than 3 mm apart when the tack are folded to any point on the foot and when the cloth in the foot is as flat as possible’: @) yes. @)no. WIDTH OF There SAILS are taken on SET IN GROOVED different the principles luff when the spar. This "B" measurement. SPARS the applies to as sail the to is which point measurements set with a width at the luff-rope head, in shall be a groove in crosswidths and the 34 Would you prefer: @ Measurements shall be taken including the luffrope. (8)Measurements shall be taken excluding the luff-rope. © Measurements Under "C" a access to ted spars if different sails sail actual of taken spars different degrees of not suffer and the spar. to the not be and aft able the to sail from pressure to of used set in reduction the measure measurements design were penalty edge accurately without would later. a mast. luff "A" possibly and groove, through a slot "C" but be affec- will give these between the SAILS Should the class continue to permit pocket luff sails: @)yes. @® no. Pocket luff therefore mast the LUFF be sailmaker would do POCKET 35 shall is sails can often given included in be a the made more penalty, sail as aeordynamically in area. 8X the effecient present rules, and because are the 36 Do you want to measure the widths on a pocket luff sail to: A the aft edge of the mast. B the forward side of the mast. C the forward side of the pocket luff with the mast removed. Under "A" and "B" a sailmaker would not be able to measure without access to the actual mast and the measurement would be affected if the mast is substituted for a spar with a different diameter. MAINSAIL "A" MEASUREMENT 37 Could you accept that the luff length "A" be measured between coloured bands on the mast: A yes. B no. The advantages of couloured band measurement are that it easier to check the sail setting when racing and it is no problem when measuring sails with a flexible luff-rope. HEADBOARDS 38 Could you accept that the headboard be folded down on the sail, i.e. it would become a part of the sail: A yes. B no. This is the common position of headboards in most classes, as it makes it easier to control the width and shape of a sail at the top and it makes it easier to control the setting of a mainsail while racing (see fig 9). Max 19 mm ax Fig 9 Fig 10 25 Fig 11 (@) that the headboard shall nowhere be more Would you then prefer: than 19 mm from the head. Fig 10. @® that the greatest dimension on a headboard shall not exceed 25 mm. Fig 11.(@©@ that there shall be no restrictions on a headboard. EXCESSES IN CROSS WIDTH MEASUREMENTS When unstayed rigs (rigs without shrouds) are used, it is necessary to cut the sails with larger luff rounds, as the mast will bend under the boom downhaul (vang, kicking strap) forces necessary to control the leech. When the width of a sail is controlled by cross widths, the sailmaker usually has to trade on the roach when he cuts a bigger luff round (see fig 12). A problem with this method is that, if the cross widths are set to produce a roach as, in fig 4, the leech would become concave if the sail is cut with an extra luff round (see fig 13) rf cross widths are set to produce a roach as in fig 1 when the sail is cut for a straight mast, a sail with extra luff round would look as fig 12, Another method is to allow excessive widths and calculate the extra area with the following formula: A(2x + y + 2z)/6. "A" is the luff length, "x" is the excess in the 2 height width, "y" is the excess in the 4 height width and "z" is the excess in the 4 height width. 9* If excesses in cross widths are allowed, this can be exploited by using a wide top which can be made aerodynamically more efficient (see fig 14). This can be punished by introducing a penalty: 2(x -z) to be added to "x" if "x" is larger than oe "z". Fig 13 Pig 14 allow excess in cross widths without a wide Would you Pp prefer to: top penalty. ® allow cross width excesses with a wide top penalty. prohibit excesses in cross widths. SAIL CONSTRUCTION AND MATERIALS The present rules, although this may not be generally known, also permit wing rigs. 41 Do you want to limit the Marblehead class to yachts with soft sails (sails that can be rolled or folded without damage): (A) yes. @) no. 42 Which types of sail material would you like to allow: @® only woven materials. @®)all types of materials. Please note that woven sail cloth in lighter weights are almost impossible to obtain, for example in North America. 43 If all types of sail materials are permitted, would you like to per- mit all types of sail material in the corner reinforcements: @ as long as the corner reinforcements could be rolled (with the excep- tion of headboards). (B)even if the corner reinforcements could not be rolled. 44 Would you like to permit contrivances like end plates and fences: @ yes. (@) no. 45 Would you like to increase the permitted length of the battens in : @)no. h) (@) yes. jibs to 102 mm (double the permitted roac NUMBER OF SUITS OF SAILS Views have been expressed that, in order to control cost, the number permitted suits of sails should be limited. 46 Do you want to limit the permitted number of suits of each rig: @ yes. @®) no. 10* 47 if the number of suits of each rig are one suit of sails of each vig, Glens suit of sails of each rig, except the sails of lowest, where each rig, limited, would you two suits may be permitted. © except the lowest, where three prefer: one suit of suits may be per- mitted. @® two suits of each rig. ®) two suits of each rig, except the lowest, where three suits may be permitted. @® three suits of each rig. All alternatives refer to a race or series of races, SPINNAKERS 48 Do you want to: ® permit spinnakers. prohibit spinnakers, General NAME OF CLASS 49 What name of class do you prefer: @ The International M Class. @® The International Marblehead Class. © The International Marblehead MEASUREMENT 51 50-800 Class. CERTIFICATES Would you like to introduce to have "A yacht valid measurement certificate": @ yes. (no. If it is choose 52 permitted suitable equipment Do you want to several at the introduce certificates start of the rule, shall have it would be only one possible to an event. "There should only be one yacht in the class with the same registration number": @ yes. ® no. If there be possible an event. are several to yachts choose a RENEWAL OF CERTIFICATES The pratice normal long as there certificate and owner always the are shall class certificates classes alterations sails the - shall to 24 19.2. months an up-to-date It same suits is registration the that the and the stamped, signed, to keep has been pointed register are the start entered certificate the it would are valid data and yacht in out that in the class The accordance and of so by a measurer. is unnecessary paperwork yachts at certificates figures or number conditions comply with responsibility IYRR every the that be measured and has rules keeping no with yacht in yacht and new rules of the rule, renewal with of other methods used. 53 Would you prefer: @) 24 months renewal of certificates. @® certificates valid so long 54 there have certificate. data on the UNITS as Would you and for Imperial GRANDFATHER general those alterations to the figures and OF MEASUREMENT the prefer (A) only : SI In been no international rules and measurement (Systeme Internationale) units units. certificates (m, g etc) @® SI CLAUSES the hull shall comply with current when the yacht was first either the current certified and rigs class rules (spars or and sails) have to comply with the present rules. When a revision is carried out XXXX there shall are also other comply with alternatives the rules valid as, at 1* Yachts that first time, certified before or, Yacht first certified before XXXX do not have to comply with the present rules un- til XXXX. It will be easier to decide which principle that shall apply when the results from the questionnaire is known and we will therefore distribute the new draft rules in the autum together with questions covering these issues. MEASURED SAIL AREA If a more strict interpretation of roach and foot round is preferred, you may want to compensate for this loss of sail area. This is another issue that will be covered in the smaller questionnaire in the autumn if this situation arises, but to gauge the general opinion, we would like 55 to If ask you a sail increase the shape following question: as 1 in fig is preferred, the permitted measured sail would you then area to compensate lost area compared with the shape in fig 2: @ yes. @® no. SIZES OF REGISTRATION NUMBERS It has to do been proposed so, but mainsail the may be and again this tionnaire in rule 3.6 that space the an these shall available issue autumn. for to the IN SAILS affected by which is like for be It may be possible the registration numbers shape that will increased. be of roach covered Registration numbers that in are is the on the preferred smaller also ques- governed by in the RC Yacht Racing Rules Appendix. CONFLICTING RULES There are gether this some and will be Finally we among ship if some such covered hope in Fleetwood. the these and When votes the vote Remote for it We is are each have now for counted 25 this questionnaire combinations in that in smaller should result at tried you to each shall be regattas to do from not fit to- the voting, cover choose thoroughly and as and country will Marbleheads that questionnaire. questions the Marblehead yachtsmen possible one alternatives registered at many to have no Champion- alternatives at two 31 Controlled and Freesailing Marbleheads will be countries without FS registrations will World as vote. have as the discussed basic votes December and 1985. separated and infiuence on the FS voting. If you are very much do hestitate not countries, officials tribute Voting than 15 but as such forms to do against some spread your not it will send not be alternatives views such views possible and to in reasons the for us Union to put this questionnaire, to or the other member any of together its and dis- views. shall September be received 1986. by the Rating Rules Officer not later weight Jan of around Moorman shape. had Still in 3.2kg, a or 7.7 sweptback early days lbs. rig of like a windsurfer experimental stage with at heavy sailcloth Wolfgangsee. to maintain MARBLEHEAD Additional Technical Before must questions whose answers are ADDENDUM required into asked any about detail the a TYPE fundamental (b)Do you want a 47 OF RULE REVISION like specifically related of principle REQUIRED. there problem? (c)Would you Nits IMYRU of the existing rules modified only where measurement methods the question 46 (a)Do you want the rules completely rewritten? is by Committee. going be QUESTIONNAIRE to see measurement to the 'M' YES ; NO YES NO instructions rules used to clarify the measurement? : NO YES): YES : NO NO YES NO YES OF MEASUREMENT (a)Are you in favour of METRIC only? (b)Would you permit both METRIC and IMPERIAL UNITS? Another 48 NUMBERS. important Naviga question already which are larger Would you like than to see is use that car IMYRU the size registration rules bigger of sail of SAIL size numbers require. numbers permitted? Also questions must be asked about your views on THE AFFECT OF 4QRULE CHANGES ON EXISTING BOATS before considering rule changes that might put your (a)Wouldyou accept boats out of (b)If boats boat of rating. that new rules may require putting existing rating? are put YES out of rating by favour of a grandfather modification? (c)Are you out in clause to new rules, permit them are to you race favour of such grandfather clauses ; NO in without ¥YES NO lasting permanently? YES" % NO On the question of the measurement of sails which is really the major issue of the rule revision the section of the questionnaire 23-35 gives a very one sided picture of the alternatives availabl e by directing the questions towards the IYRU measurement instructi on solution. This may be ideal for a new full size one design class where all the sails are the same, but it creates problems when applied to an existing class, to rate fairly the thousands of suits of sails of varying design which are already in existence. During the course of the Technical Committee's work on this subject, method a variety and the of existing following sails became were evident. (a)fThe cross width measurements at +, 4, measured using this and } heights related to a standard 5lmm (2") roach varied between low and tall rigs MAINS as follows: JIBS (constants in millimetres) ip + 2B + 4R + (17 to 58) 3k + (21 to 60) (35 to 66) (41 to 66) Sy + (34 to 60) The question is how do you If a generous Limit is set set limits to suit to suit tall rigs, 3R + (20 to 55) the existing sails? lower rigs will get bigger roaches or more luff round in the future: tight of rating. (b)It is Limit A set tricky took about innocent then quite problem! three or four times as sails will long to be if a put out take cross widths than to check the roach Limit and luff curve limits under the existing rules. This may not seem significant as the roach limit check only takes about a minute but if you multiply this by several thousand sails the extra work really must show very clear advantages to make it worthwhile. The consequences are more far reaching than just measurement time. The manufacturing time will affect the cost of commercially made sails. Currently making 'M' sails is relatively simple with the 5lmm (2") Limit dictating the roach size and standard ‘patterns! being used to shape the 'ends' of the roach. If the roach shape is unique and related to the foot measurement then more time will be required 22 setting increase 50 Are you the cost up in favour of to used IYRU an the can lead the a rules cost that will increase system and mistakes being placed straight edge mistake height point made in the this any is not figures Is the chance different the point of from or nearest calculation the of an an point cross on the width limit? (d)The cross width measurements smaller suits: width limits and roach length of fixed limit cross is why then only far widths straight make 3 check appeared 914mm(36") when a same comment applies measure jibs simpler? really The necessary to measurement fixed answer is, measurement The in above the One or to of is currently in would and the CURVE IN MAINSAIL extent of the or fair measurement Are you curve point as in DEFINITION good blaming into a of poor old to of of : have The clew has on the lower aft edge of in taken time the Are you SAIL sail 2 and as in present state on (first a flat ROACH SHAPE limit of accepted : 51mm back by No of by the 'coin' any described alternative. division between or questions (2") just luff curve Any a away for is not the is at a which should the 23. Jan's the fair curved the after is as class started the point limit added (b)'the corner with so be case of would argue and Where 4) clause shall just projection everyone. IYRU line where YES IYRU to of 'clew' what it's be 4 has about from the clew is the doubt the apply with being simple starts is NO the in tension fully YES so CONDITIONS OF a dry to taken'YES roach measurement not (b) measurement than measurement that NO measured sufficient of : should repeatable 'sails with (a) clause more procedure? the of : one - projected somewhere interpretation consistent leeches (a)'the distinct NO rule roach be 3: no jib edge' defines a It current perhaps form not the taken definition? can headboard straight deliberate clear. because 'the must paragraph one cross YES been sail of controls height question turning even this this across different order limit }$ of are in which cut cater to are roach then to making since surface (2") found which rule point.' MEASUREMENT wrinkles between Is defined DURING folded. sections for clew this measurements ill be the changed! of : of preamble therefore clew favour SAILS remove is if those 51mm always To the is NO located principle properly the this were MEASUREMENT the 3 the words instructions that at demonstrate figures leech triangle'. the been have approach? complied jib is cannot suggest shape. because mast! clearly that existing bridged materials the of a jibs. the the existing up measured the the this a shape to a difficult. major mast in definition vertical The be behind the over against because height not only point side retain If the the modern wouldn't do control described CLEW 4 projection would favour to : roach sufficient avoidance places check a batten sail not other but class. LUFF line the misunderstanding follows. is the modify as width the practice be importance the when then that 23-35, creating within sail show to measurement factions the comments preamble other course, which alternative sail roach 3 cross YES height The those 3 luff? on is the in arises batten set sail a minor problem half to NO ‘toverkill' the (e)Lastly a YES to be an calculations NO comparative made. measurement that YES there are more to chosen or therefore measurement limits measurement inaccurately 52 a 95 fixed positioned Are 54 adopting inaccurately on 53 of simple inaccurately luff and sailmaking? (c)Compared in measurements, considerably. complexity 51 these oy in line understood where and and how NO the ends of this The IMYRU view is area shown in permitted unmeasured area is to be shaped. that you can do what you like within the figure 2. Tight curves, sharp corners or any shape that the current sail materials will allow you to set are permitted. This freedom is, after all, the essence ofa development rule. In practice this freedom to gain as much area as possible is limited by the fact that it must set well to be efficient, so most commercially made sails have varying degrees of curve joining the 5lmm (2") Limit line with clew or head. The view of NAVIGA is that the back edge of a sail should be a fair curve from head to clew within the 51mm (2") roach limitation. Whatever the reasons for NAVIGA imposing an additional restriction the effect is that we have two rules which are dividing the class in Europe. Aesthetic arguments are put forward by some NAVIGA enthusiasts but others have adopted curves that look very much like those on IMYRU boats because they can '‘interpret' what is a fair curve over such a long length. We need to decide on a 'habit' which will satisfy all of us and the solution may be found on the cutting out benches of the sailmakers. They use standard'patterns' for shaping either end of the roach. Why not adopt a standard pattern as the maximum curvature between head and clew and the 5lmm (2") limit line? For example the arc of a circle of 165lmm (65") radius would ensure a fair even curve between head and the top batten of a tall rig: This (5lmm (2") in 406mm (16")). compromise would provide a very simple way of achieving a fair ,curve over 4.0% of the leech of a tall rig (100% on a 3rd suit.{)and would limit the extent of the unmeasured area so there would be no further disagreement. Fig 15 ) “The Dark Crystal’ 82.25 Seventh – David Burns (ACT) ‘Linnet’ 82.75 Eighth – Mike (NSW) ‘ Panda’ 96.25 Ninth – Philip McElwee (T) ‘Live Evil’ 107.25 Tenth – Bill (NSW) ‘Aussie 139 Eleventh – Walter Pettingell Newman Grenfell McDonnell (NSW) Pursuit’ Coho’ ‘Merry Seas’ 166 AN – RA CLASS 1885AUSTRALI A fleet of nine yachts entered, five ‘Baron’ modified Foxy Loxy hard-chiners, two Knowall 2’s (Rashbis and Flash Harry), a Brewer ‘Sound Effect’. (Sizzler, Max Grigg’s twelve-year-old heavyweight), and one Brewer Hi-Ho (?), Pat Cox’s’Fear Wo Vind’. OOD was Norman Lorimer, and a 9-race, 6 boat per race schedule was used, sailed five times to give each entrant thirty races. The racing was friendly enough though fiercely competitive, with quite good rule observance and skippers accepting 720 penalty turns, only two protest forms being filled in, both for “unduly predudiced” when the offending yacht had already accepted penalty. The most entertaining of these involved Pat Cox, who claimed redress for delay caused when Harry Rouse’s ‘Drifter’ dropped her mast across ‘Fear No Wind’s’ bow at the start. Delayed over a minute until the rescue boat could seperate them, Pat put on a display of power sailing and caught the fleet, dead-heating for second place!!! Philip McElwee’s win was a triumph of consistency, he finished in the first three in twenty-eight of his 30 races!! Despite sixteen first places to Philip’s ten, Pat Cox’s early inconsistency was too much of a handicap, and he finished a very close second (you can’t get much closer than a quarter of a point!!), with George Fish snapping at his heels in third place, three points behind Philip. Points Skipper and Yacht Place 1 2 3 4 5 6 % 8 9 Philip McElwee (T) (V) Pat Cox (T) George Fish Stephen McElwee(T) Michael Hickman(T) (T) Max Griggs (T) Kerry Baker (T) Terry Newell (T) Barry Rouse Neon Knight Fear Wo Wind Rashbis Neon Knight Midnight Flyer Sizzler Flash Harry Lady Di 35 42.50 42.75 45.50 62.25 88 99 106 125 131.75 Dave Burns with his Phase II Two Australian boats, not upside-down but sideways! Tenrater and Trevor Claridge with his FCl2 at last Australian Nationals. 1985 AUSTRALIAN NATIONALS — With a 28-boat with the of Weed in did!). fleet and the matrix system adopted, task of the event, the RM CLASS ensuring that 56 so started the races wre conducted over the first race on time lake proved a problem, Ron Attard (Vic) OOD Max Griggs was faced despite slowing any boat sailing his own-design the very clear front-runner, finished lower and Bill Pettingell’s than third place, David Shepherd Attard was still of Stephen McGelwee’s (T) ‘Peregrine’ (NSW), whose and Arthur Thompson severe to sideline The race of and Bill all of Bill he “It leg, first (on Port tack) with every tack, margin. last neither won, but I was worth coming just most common design in the way 1 for event 2 David ShepherdRon 5 Pat Cox that (NSW). Bullet (T) 17 — 23 — Attard – Peregrine Hands Off (V) in a fierce The lead changed hands hadn’t he’d still to the closest have remarked as race”. ‘Huff’n’Puff, A sailed majority of by most of the competitors used 15 Trevor Claridge-Slippery w/wet(T) 80.50 16 Phillip Page 82 Est (T) 85 32.50 19 David Burns – Tuppence 42 20 Ian McElwee – Diamino 21 Ross BRewer – Narrow Minded(NSW) 103 22 Alan Dawson – Embassy 110 Mike Newman Siz 8 Mike Paine-Raffert’’s Rules(T)55.50 9 Rob Claridge – Ecoe – (NSW) Dave Thatcher (V) (T) Pack P.C.O. 18 7 – – 25 7/16 Puffin (NSW)55.25 (T) 57.25 – Plum Crazy 2 (V) 97.75 (ACT) II 99 (T) 99.75 (SA) 23 Norman Lorimer-Superwomble(T) 119.50 24 Walt 129 25 Iain Kirley – Sir Ken Claridge- Buster Bil1(T)67.50 26 Gus Keesson – True Blue 10Michael Hickman-Bumblebee(T)63.50 1liJohn Shepherd – 13Gary Backway14 he was the 6 George Fish – 12 when Stephen McElwee then joined battle Pettingell-Steamboat (NSW)24.5017 Barry Rouse 4 (T) masts. Stephen McElwee-Shockwave(T) 3 Bill lead, last day, and relied on judgement even if Tasmanians and also by Phillip Page carbon-fibre Norm Lorimer Arthur’s being sufficiently with centimetres to spare. that The strain one and then the other clearing his would give feel Ron the competition. both established a long up the leader. competitors and their yachts, sported a swing rig, had winch problems, him for the rest Pettingell opponent’s bow The (V) a hadn’t of his consistency. both the ‘ still became which was to threaten the lost some II many had woken up and was sailing well, the Championship occurred late on the tacking duel did, ‘True Blue (and provided the (Eclipse?) competition was beginning to show in Gus Keeson (T) ‘Steamboat’ (V) wind. with multi-panelled (Huff’n’Puff Mk 3) Pat Cox but had some ‘Shockwave’ started his charge in the chase light which caught Bantock lightweight sails won the first heat. Norm Lorimer first hilarity of the event by hitting a starting mark. On the second day, three day period Attack Mini (T) Maxi 64 McDonnell-Endless Love(NSW) (V) 67.75 27 Arthur Philip McElwee-Strutter(T) 67.75 28 Sandra Bruer (ACT) 133 II(NSW) 144 Thompson-Indulgence(V)) 151 Burns-Tuppence 155 (ACT) AUSTRALIAN NATIONALS 1985 EC12 CLASS A disappointingly but dispite first day this left but the winds was the boat performing improving small the some field of six entered competion was fierce. skippers increased and with literally second suits Clear red were faces, popular. but few could very well. The second day saw stronger experienced, an Results were: 1. John Shepherd 2. Richard 3. Philip interesting Overall, Fisher Mcelwee – but on the situation Fleet, third EC12’s, skies and beat, positions, so! the to their do for Richard day, the John Fisher’s winds, when all strong winds sunshine on was Shepherd’s the over two the welcome ‘Spectre’ ‘Silhouette’ with gusts from Tasmania was also leaders 15 knots were developed. Match Champion: ‘Spectre’ 4. Trevor Claridge – ‘Mista ‘Silhouette’. 5. George Fish – ‘Red ‘Exciter’. 6. Norman Lorimer 37 T’ Dancer’ Nemesis’ The Nordic Marblehead Championship will be sailed 6-7/9 in the south part of Sweden. Only the best Marblehead yachtsmen from Denmark, Finland, Norway and Sweden are permitted to enter and there are a limited number of places for yachtsmen from other countries. Information from Olle Bengtsson, Byholmsvagen 78, S-291 51 Kristianstad, Sweden. The Swedish Marblehead Championship is sailed 30-31/8 and the Swedish 10 Rater Championship 13-14/9. Information from Clas Jon-And, Onnemovigen 25, $-146 00 TULLINGE, Sweden. All events for RC yachts. Late news: The Royal Gothenburg Yacht Club (two times America’s Cup Chal- lenger) and The Gothenburg Jettysailers will apply for the 10 Rater World Championship to be sailed week 32,1987. ODDS & ENDS FOR SALE All unused and for sale. Price £200. Walicki M-Boat hull,fin,rudder and deck. Joop van Dijk, Willem Gertenbachstraat 52, 1106 WB Amsterdam. Holland. Nooky Bear. 1983 Eastern District champion. 3 suits of sails, two masts E130; Complete with fitting and two fins £60. Delusion hull. R. Low, Southend-on-Sea 206184 RA le simp rnal inte b (lyl b 4l4l , vane s Jone s, suit 2 p., g.r. , K999 t, Afri s Clas A conversion?). RM Harem, ply, 1 suit. RM Vaco-M, g.r.p., uses same rig as Harem, other wise no mast/sails. No radio. Roger’s Lazy Devil M, diagonal veneer, winner Fleetwood vintage race, 3 suits, Jones vane. All sailable but would repay some attention. Space needed – offers? Further details Vic Smeed, P.O.Box 6, Rickmansworth, Herts, WD3 4RE TRAPPER ME6. Completed by Oliver Lee. Sails by Bantock. Jackson winch. 3 suits Victory sails, 2 carbon masts, Andrews winch, 4 channel radio DECEPTION K3278. with jib twitcher and trim tab. Phone Norman Curtis 0734 663512 for more details. 21 Wallace Close, Woodley, Reading, Berks. WANTED Magazines/books etc. on Model Boats and Yachts. Also nos. 1 to 12 inclusive of M.Y.N. Geof Hooper, 12 Bramble Crescent, Durrington, Worthing, West Sussex, BN13 3JH (phone Worthing 62013) clubman I have noticed boats with internal tillers have hatches over horns and shaft cut off at horn level; natural to do seems (A). But it would hardly complicate matters to restrict the hatch to position (B) and introduce a bearing and extra horn on for the shaft, top threading few occasions required. JOHN HENNINGHAM it is > _t lliS ae ee eee DESIGN SERVICE The following plans are available each including U.K. suitable for postage, through M.Y.N. Unless otherwise and are dye-line prints showing full noted size they are seetiona £5 ete, home building. TWISTER A double-chine high performance design Plans cover Moderate alternatives displacement by noted Australian designer to for the American allow for radio 36/600 weight. and continental Price Adrian 1 metre Brewer. rule, £5.00 MINI-CEDAR A French plan and model as a for a sailor. one-design 1 metre class boat. Plan class shows in total France. Designed by a well respected construction details Price for home naval architect builders. Adopted £8.50 RM” 1000″ Now well-known on the but fast yacht. U.K. A GRP club meeting circuit, hull, fin and rudder is and established available from as an easy-to-sail E.L. Jones. Price £5.00 HEARTBEAT A proven competition marblehead Jubilee vane regatta 50/800 with both vane and radio. at Fleetwood. GRP hull, fin and rudder Won the Golden available from E.L. Jones Price £5.00 CEDAR 4 The latest RM design from Paul pretty hull STARSHIP Lucas. and capable of high performance in the right hands. Carl Fagergren to provide a JET Price Very £8.50 III Yet another very attractive hull. lead and Again a fully detailed plan via M.R.B. fin shapes. Developed by noted Swedish sailors Jan Dejmo and rather different Price £5.00 2 look but with full attention to ReGRer Now the keel, UONPVPriLA@le # SERVICES Full-size plans catamaran. on two In French, also available in U.K. sheets giving details but easily understood for for as this boat via M.Y.N. construction of detail is a 1/12 extensive. G.R.P. Plans price £12.50 SAILWINCHES TheChampions chotce isthe WHIRLWIND ‘WHIRLWIND’ SAIL WINCHES are used by winning R/C yacht skippers in Britain, Australia, Brazil, Canada, Hong Kong, New Zealand, U.S.A., Most European Countries. Their quality, reliability and light weight makes ‘WHIRLWIND’ THE NAME IN SAIL CONTROL Modols available to suit all sizes of model yachts including 36” and scales 12 m’s. send large s.a.e. for details DAVID Tt. ANDREWS 40, MIMEDALE ROAD LEICESTER LE2 6GE ENGLAND Telephone: Leicester 883309 scale racing hulls THE OLD MAL’TINGS QUAY OLIVER YACHT DESIGNER J. AND BOAT LEE BURNHAM JNON ESSEX CMO 8AS BUILDER MALDON CROUCH ENGLAND (0621) 782305 ‘ | / terrute | | | | / 118 800m ° THE VERY LATEST IN RMs.. DESIGNED, MANUFACTURED AND MARKETED BY OLIVER LEE YACHTS, ‘THE TRACER IS A DIRECT DESCENDENT OF THE WORLD FAMOUS TRAPPER WHICH FOR THE PAST BIGHT YRARS HAS BEEN ACCEPTED AS ONE OF THE MOST RELIABLE AND COMPETATIVE RMs. LEB QUALITY GLASS FIBRE HULL AND DECK. SPARS. TRACER KIT PRICE, GRAHAM BANTOCK SAILS, IS AVAILABLE AS A KIT OR CUSTOM BUILT TO ANY INCLUDING LEAD KEEL AND SAILS £2!13-00 FOR COMPLETE SPECIFICATION, LEAFLET AND PRICE LISTS. 40 ON THE MARKET. ANODISED ALLOY OLIVER GROOVY DESIRED STAGRH OF COMPLETION SEND S.A.F. NOW 70 OLIVER LER YACHTS