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May 1981 55p (U.S.A. & Canada $2.50) nab MODEL MAGAZINE ‘ Salt Peat© we “s+ a het) il : 4 alii non ee a _ 13 October Ashton Open RM 4 11 South Western April 5 Open RM 26 SWDC RM 21 Open RM 5 Open RM Idyllic setting for New Zealand reader John Cordy’s RM, see text for details. HE running of the MYA league championship has been passed to the new Racing Secretary, Jack Lee, who has introduced a new dimension (in association with originator Peter Maskell) in that both vane and radio will have three divisions, the principal idea being that small clubs without much chance of coming top in the present open set-up could at least top a division; the bottom three of Divisions One and Two will be ‘relegated’ and the top of three of two and three will be ‘promoted,’ so there will be an incentive for extra effort to achieve promotion or avoid relegation. Based on last year’sresults the radio divisions willbe clubs 1-9, 10-18,and19 on. Vane will be clubs 1-8, 9-14 and 15 on. New clubs will automatically be allotted to Division Three. The existing club trophies will go to Division One winners but additional trophies will be awarded to the winners in Division Two and Three in each category. Only one individual trophy will be awarded in each category, as now. A further innovation is that a club can claim points if one of its members takes on the duties of OOD — 25 points for a National, 15 fora District Championship or major race(e.g. Nylet, Champions Cup, Peter Bryon Memorial), andfive foran Open. Skippers sailing for more than one club cannot total their individual scores for the individual league points. Nylet Trophy RM, Nylet Trophy RIOR, Peter Bryon Memorial RM, 24 hour. RM 5 Chippeham Woodspring Woodspring Hereford October 11 Open RM Plymouth Dovercourt 3 Open RM Chelmsford EDC RM Broads 10 17 31 EDC RM Team June v4 Open RM Broads Open RM Canvey Open RM Kings Lynn July 19 August 16 13 20 Open RM Open RM Open RM a Team Championship, 30 fora District and 48 for sto 36R, RA andRIOR National 20 for an open. Full points details are in the handsof all club secretaries. Dates May Northern 10 26 2 3 Open RM Leicester Open RM Open RM Birmingham Rugeley 9 17 Open RM Lincoln Open RM Leicester OpenA Leeds & Bradford June 12 Open RM Etherow Open 10r Leeds & Bradford July 19 NDC RA Fleetwood Open M Birkenhead August RIOR Birkenhead 17 2 September June 7 28 Open M NDCA 31 NDC RM Fleetwood NDC M Cleethorpes Fleetwood Birkenhead 19 Cleveland Open RM Peter Bryon RM _ Fleetwood Open RA Cleethorpes August 9 NDC RIOR 16 22/23 24hr RM Cleveland Fleetwood 31 Leeds & 30 Open RM < Bradford 274 MDC RM Open RIOR Fleetwood NDC 36R Cleethorpes NDC 10r Leeds & Bradford Dovercourt Open M Norwich MDC M MDC 36R Birmingham Open M Bournville Open M Open 36R Bournville Open RM 27 October Leicester 17 Open RM . Birmingham Birmingham MDC M Team Bournville Open 6M Birmingham OpenA Bournville Open 6M Bournville OpenA MDC 6M Birmingham Open 36R Birmingham Open 10r Eastbourne Bournville 26 1 Open A EDC M Birmingham Bournville Metropolitan and Southern March 29 Open RM New Forest Team April 26 Nylet RM New Forest May MSDC A 31 Gosport June September 6 20 November July 5 12 14 19 May 4 Dovercourt 23 26 Norwich Canvey Chelmsford Leicester Leicester Crosby April Open M Kings Lynn Open RIOR MDC RIOR Open RM 15 Dovercourt March April Vane Open M Midland listed below. Radio EDC RIOR September 6 28 and venues of all qualifying races are as follows: Decoy Dovercourt 21 pionships, A and M National Team Championships, plus eight open races as March Open RM May 1 15 Points vary from 100 for winning the A, M or RM Nationals and 80 for 10r, S. Wales September 6 Open RM 20 SWDC RA 27 Open RM Cheltenham 12 Championship, plus eight open races (listed below). Vane — A, 10r, 6m, M and 36R Nationals, A, 10r, M and 36R District Cham- Newcastle Eastern April 4 Notes for diaries of qualifying events are as follows: Radio — RA, RIOR and RM Nationals, RA RIOR and RM District Championships, Champions Cup, Fleetwood Open 10r Woodspring October League events OpenA 9 Open RM 30 SWDC RIOR June July N. Liverpool August Appledore May 3 Open RM Open M Fleetwood 7 Open RM Chiltern/NF Model Boats 14 MSDC RIOR 21 Hove MSDC RM Woodley OpenRMTeam _ Guildford Open RM New Forest 29 12 July 19 September 6 27 Open RM October New Forest 4 18 25 Open RM November 1 Open RM Clapham Gosport MSDC M Clapham MSDC 10r MYSA Open M Team Eastbourne MSDC 36R_— Hove Guildford Additionally in the Met. and S finalised. Open A District there will be 36R Team, yet to be Many of the foregoing are races for well-known or old-established trophies so that, together with the National Championships etc. listed last month, much of the 1981 regatta list has now been covered. New Zealand RM John Cordy, of Wellington, sent a couple of pictures of his RM sailing ona local water, together with some details of the yacht, which is built to the Frenezy design using a grp hull. Displacement is 15Ibs, 8Ib of which is lead on the endof an 18in. fin: Maximum beam is 10%, in., transom beam 7%in. andthe rudder is an astounding 15in. deep. A Futaba winch is used, with an endless under-deck sheeting line. His first boat, John says she sailsvery wellbuttendsto slow down when the club expert hands him the transmitter. Measures Occasional queries are received from non-club members who have built a class yacht and would like to get it registered . Unfortunately, it doesn‘t work like that. A yacht is measured and registered in order to qualify it to race in MYA events, and since such races are for MYA members, a yacht owned by a non- member is not eligible for registration. Each club pays an affiliation fee to the Association, and the Association's fee to the Internatio nal Model Yacht Racing Union is partly based on the number of registered yachts. Thus if the register was opened to non-members, the Associati on would be paying out for them with no return. There are some races, often at club level, where non-members with unregistered boats can participate, but these are relatively few. However, most clubs would welcome participation in informal races by non-members, once or twice at least, in the expectation that the visitor would find it sufficiently enjoyable to want to join. Club fees are pretty modest on the whole and newcomers are most welcome in almost all clubs; there are one or twowith a membership putting a strain on available facilities, but these are exceptional. An sae to the Cowells Jigsaw : Rugged, trouble-free design Widely accepted by educational authorities for use in schools, this jigsaw is indispensable for the modelmaker and handyman who are looking for a no-nonsense, hard working machine. @ One piece body casting @ Balanced crankshaft to minimise vibration @ Built-in safety features @ Large diameter spindles and bearings for long, continuous| trouble-free work @ A price anyone can afford @ Cuts wood, plastics, metal, slate, bone etc. @ Continuously rated motor Write to us now for details, and address of your nearest stockist Cowell Engineering Limited Oak Street Norwich NR3 3BP England Phone (0603) 614521 Telex 975205 Don’t settie for less. Editor, or through the Editor to this column, will provide the address of the club most convenient to you. All clubs have an official club measurer, whose duty it is to measure a member's boat conscientiously according to the rules, record the details ona certificate and forward the certificate plus a declaration card via the club secretary to the class registrar. The declaratio n card is in effect the measurer’s word that he has checked the boat in accordan ce with the rules. There is no point in having class rules to ensure that all boats meet on an equal footing unless each boat is accurately measured to ensure that it conforms. Regrettably in the last three or four years, some measurers have failed to appreciate the necessity of being as strict as is required of them and some instances of laxity have come to light. Insisting modification can seem hard, but rather than be argued out of his position, or bulldozed bythe club ‘expert,’ a measurer can and should say that there is doubt and that he cannot conscien- tiously put his name on a declaration card; the owner can always ask another club’s measurer to check his boat. This in fact happens with As and 10rs where a club does not possess a measuring tank and the measurer of a club which does undertakes the necessary checks. The odd mistake in calculation must be expected, but it is basically up to the owner to see that his boat is correct. If at a race his boat is checked and found to be out of rating in some respect, it is no good blaming the measurer, although a really good measurer should pick up any discrepa ncy at the time that the boat is measured. Stretching of rigging and trim adjustments can make sufficient alterations to put a boat out. Where there is cause for some disquiet is in the practice of measuring and certifying a yacht before it is completed, cases of which have come to light in the last two or three years. In classes where sail area is affected by waterline length, not quite finishing the sails is understan dable, providing the measurer checks them after they are finished but in every other respect all model yachtsmen have the right to expect that a boat is completed and that measurement United States Sales: i Cowells Incorporated, P.0.Box 427, 226 East Adele Court, Villa Park, Illinois, 60181. Phone (312) 279-0490. Telex 72-1586. takes place with the yacht, as the rules State, “in racing trim.” Anything else is sharp practice. May 1981 275 Presenting plans for the Sail 80 World Championship winning Marblehead, Kisutch and its derivatives — . . 36/600 Marblehead This month we present plans for the 36/600 Designed by 10 Rater R. B. Sterne derivative. June issue — Keta. "__NERKA 36-600 M,) 72. Sterne The Model Maker Plans Service 13-35 Bridge Street. iteme! Hempstead. \\ A \ Herts \ \ MM 1314 are drawn half 35, Bridge Street, Hemel Hempstead, Herts HP1 1EE. Plan and elevation Plans for Nerka are available from Model Boats Plans Service, PO Box plan MM1314 when ordering, price code E, £2.00 plus 35p postage and packing (UK). full size, sailing rigs one tenth full size with full size body lines. Quote Now that all the theorising was over, came the practical task of testing out the idea. While | was still in the thinking stage, Kokanee plugmaker Mike Coomber decided that he wanted to build a 36/600, and after dangling the bait in front of me for about 30 seconds he had me hooked on the idea of building the Nerka to test, and if it was successful then we would work on up to the Kisutch Marblehead. We obtained some 1in finished 6in wide clear cedar, and set about building a solid wooden plug on the buttock lines, which we chose so that the planks would be cut out in pairs, insuring that both sides of the hull would be the same. Mike, as usual, did a beautiful job on the plug, and soon had it ready for finishing. After many coats of resin, and a lot of polishing, we had our gleaming new plug before us. During the time Mike was working on the plug, | had developed a new system of making decks, fins, and rudders 282 using balsa core/fibreglass construction, and had made a mould for decks up to 13in wide and 8ft long, and moulds for all the fins and rudders we needed. The mould for Nerka was soon finished, and Mike set about building numero uno. He had it finished just in time for our regatta in June 1978, and won with the boat, first time out. The winds that day went from O to 15 kts. and the boat handled perfectly, showing no tendency to dive even in gusts where my low-bowed Sockeye was diving deep enough to display the rudder — with just the jib up! Now the hook was really set, and Mike started to talk about the Canadian Championships to be held in Vancouver in September, 1978, and after a bit of convincing that we could do it in time, we repeated the process for the K/sutch. Five skippers decided to build a K/sutch before the Championships, and the results were a joy to behold. | have a small shop where | repair Morgan Sports Cars during the day, and at night, the shop became a flurry of activity. You don’t know the meaning of the word ‘Club’ until you see five chaps working on a project like this. Mike working on the plug, Dave Collis busy cutting out booms — 20 of them!, Blair Atwell drilling holes inaluminiumT section and making 10 mast cranes and 20 jib racks, and I'm silver soldering up 10 sets of spreaders and jenny struts. Ernie Avory is cutting out wood for inwhales. By the time we had the mould finished, we had built 5 tall rigs, 5 short rigs, and all the deck fittings for the 5 boats. Three of the boats were in the water by the end of July, 1978, just in time for one of our local regattas. | was for- tunate enough to be placed second with Kisutch, the first time out. The other two boats were ready within another two weeks, and so we had five Kisutch’s entered in the Canadian Championships. Model Boats We finished three of them in the top ten spots. The ‘synergy’ paid off! The 1978 Canadian Marblehead Championships were the first real test, not only for the Kisutch, but for our whole club. It was the first time the event had been held, and the first taste of International Competition for any of our skippers. There were twenty-nine of the top skippers in and rudder of the same areas, but with an Aspect Ratio of 5, and the combined increase in stiffness (about 30%) has had a remarkable effect on boat performance. The Kisutch has not lost any of its light weather performance, and has dramatically improved to windward in a blow. Its offwind performance has not changed, and it will plane on a higher point North America entered, and the event was won by Neil Bennell, of of sailing than before. Australia, on his way home from placing third at the Worlds in South Africa. Bob deeper fin, we noticed a _ strange phenomenon. As you increase the Aspect deBow, AMYA President was second, and Chuck Black was third. All three were Aspect Ratio of 1, like some of the very old eventually When we started experimenting with the Santa Barbara, with an 18in draft, 10 Ibs of lead, a 58in LWL and a fairly short rig. These boats performed much as expected, with Allan Gardner’s Orange being fast to windward, good offwind, but a bit slower to plane than Keta or TJyee, because of its 22 |b displacement, and Jean Carpentier’s S.B. being quite slow in light weather, because of the low rig, and high wetted surface, but performing reasonably well in moderate winds. It too, however, is slower to plane at 22\bs displacement. The other ten in our American M's, the mast is forward of the fin. With an fleet is a stretched Aquap/ane, with a 55in LWL, and 62in LOA, and a displacement of about 16lbs. This boat performs at its best when heeled about 20°, to reduce the design. Epics were 4th and 5th, a Bingo 6th, and | finished 7th. Aspect Ratio of 3, like the original K/sutch, wetted area, but without putting the rail the mast is just behind the leading edge of the fin. With an Aspect Ratio of 5, the mast under due to the low freeboard. Under these conditions, it is very fast, but it does sailing Magic Dragons, a top | don't wish to make excuses, but we simply got off to a bad start, and couldn't make up for it on the second day. Saturday saw more wind than we usually sail in, and we simply didn’t have the experience. On the other hand, the wind was ‘normal’ for our visitors. Sunday was the opposite, with our club’s skippers winning virtually every heat in the light winds that prevailed. Everybody came out of the eventa lot wiser. We realised that we needed more experience in heavier weather, and our visitors found out that our lightweight boats were rockets in the light weather. | have since sailed the Kisutch in heavier winds, and with great success. With the short rig in a 15 knot wind, it is capable of Ratio of the fin, the mast moves aft. With an is just ahead of the trailing edge of the fin. not like drifters, or going to weather in Various Suggestions have been made as to heavy air. The boat was owned by Dave the reason for this, but | wonder if anyone Collis. With a mixed fleet like that, the 1980 reading this really knows. If you do, please write a short article on it — I’m curious! Canadian bound to be an interesting race. Held in the 1979 Canadian Marblehead Championships, with Allan Gardner, and April in Vancouver, the event was won by Blair Van Koughnett, respectively. The event was won by Mike Scholefield, with a Magic Dragon. During the winter of 1979, the plug and mould for the Keta were completed, and two boats produced. | feel that it is one of the prettiest 10 Raters around, and in warm-up racing proved to be very fast. My holding its own with the Magic Dragon to windward, and planes away from it off the boat was built right off the plans, with 9lbs wind. The one day | had the opportunity to sail it in winds gusting to over 30 knots, we for a valid comparison against my old 7yee, found that the boat planes on a run fast other boat, Mike Coomber’s, was built with the new ‘lightweight’ techniques, and enough that you mustrun to keep up with it, and on a board reach it goes at least 50% faster than that. One of our skippers, after telling us about the incredible planing he had seen ona recenttrip to England, where all the boats were in storm units, remarked that he had never seen a Marblehead go as fast as my Kisutch did on that day. A nice compliment, whether fact or not. I'm convinced, however, that lightweight boats are the answer. In moderate winds they may have to suit down sooner, but their light weight requires less drive anyway, and they will accelerate smoothly onto a plane without the sudden breaking free experienced in the heavier boats. The construction of Keta, the 10 Rater version of this series was delayed almost a year, due to a heavy concentration of effort on the part of our club’s top skippers to qualify for the world’s in Ottawa in 1980. This placed heavy emphasis on boat construction techniques, particularly with regard to saving weight, and I’m pleased that we have been able to cut over a pound off the original Kisutch, and have therefore been able to increase the ballast to 8lbs while maintaining a boat weight of under 13lbs all up, rigged, including 4 channel radio. This has been combined with an increase in draught to about 20in using afin May 1981 10 Rater Championships was The new Kisutch placed 2nd and 3rd at of lead in a 151 |b boat, so that! could use it now in the hands of John Hancock. The carries 10 Ibs of lead, on a 2 in deeper fin, with the same total weight. | should mention some of the other boats that we have in the 10R class in the Vancouver Model Yacht Club. Lacking experience in this class, we decided we needed some bench marks, and made a basic assumption; a 10R should be able to beat a Marblehead at all times, after all an M only rates about 7, right? This effectively limits the LWL to between 50 and 70 inches, giving a Marblehead with a huge rig, or a very long boat with a Marblehead rig. The club built one of each during 1979. Baird McLean built a 16lb Sa//p/ane carrying about 1500 sqin of sail, and Mike Coomber built the Needlefish, much like a long narrow Keta, with a 7Oin LWL and a Marblehead rig. The Sailplane 10R shows excellent speed in light airs, but is somewhat limited by its hull lengthina blow. The Needlefish had to be light to be competitive, and at 14lbs all up, this 84in long boat George Wilkins who sailed Dave’s Aquaplane 10R brilliantly, under perfect conditions. | placed 2nd with Keta, sailing a lot less brilliantly, with (I thought) a faster boat. Third went to our only visitor, John Lucas, from Ontario, sailing his own design, a Strepic (stretched Epic), a 53in LWL, 57in LOA, 16lb boat. The conclusions | drew were that the fastest boats in our club were the Keta, Tyee, and Aquaplane 10R, with the modified Clockwork Orange, and Sailplane 10R being quite close, but possibly limited by their LWL. The longer/heavier boats don’t seem to perform well in our typically light conditions, but are competitive in heavy air. | have reached the conclusion that the ideal 10R for radio control in our area has a LWL of between 54in and 58in and carries about 10 to 11lbs of lead on about a 15 to 17Ib displacement, with a 20in draft. The Keta, of course, falls within this range, although it must be built light, in order to carry 10lbs of lead at a 58in LWL. If you sail in an area of predominantely heavy winds, then the optional 60in LWL, with would be for you. 11lbs of lead On the following two days, the 1980 Canadian Marblehead Championships were held, with the first day having winds from 10 to 30 knots, and the second day from O to 12 knots. The event was won by Blair Van come Koughnett, and | 2nd, Gordon both Heisch of managed to us sailing K/sutchs. placed third with a Seahorse. The biggest lesson we learned from this event was the importance of preparation, and having the proper rigs for could only carry 7 Ibs of lead. This proved to be insufficient to carry the rig effectively on the conditions. The people who were prepared, took home the trophies, those only an 8.5in beam, in the kind of winds the boat was intended for. Two other 10R’‘s five years in Vancouver, this is the first time were built, a modified Clockwork Orange, with an 18in draft, 14|bs of lead, a 50in waterline, and a tall rig, and a modified regatta, but it sure paid off. who weren't took home broken boats. In | have had to use a storm suit during a (To be continued) 283
