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WO1} WED SIYy} BJBYM OS ‘Sains WAI UeU} 4@yj}O Jo UOIIsanb Aue usaq J8AaU SeY B19] “ANSS! YOIeW) 9Yy} JO ZGL a6ed uo pajejs se sajni eBiAeN JOU Saini 6/61 VAI 0} payies aq IIIM 22-22 Ainr ‘poomjsa|y ye Bunaaw ebiaen/VAW 24} ‘}S4I4 ‘S@Nss! }U9I81 WWO1J Spua Bsoo| Jo ajdnod e dn Api} isuyy SN 19 ‘poomjeay ‘sawer ‘py ‘o\Buejueg ssureGe sjies wieydeja jo ddeuy ‘A ‘166 eapeBauay asayy yodsoy Je sdiysuoiduiey7 SSE/D VY ay} Je JAUIUNS se] JO S2QUeIQUIaWAaY ;MOUS JNOYYM pue/BuZ Si siyp SMAN UOHeIIOSSY }YIe A [apo steering, vane controlled sail winches, and radio controlled steering and sail trim devices are so obviously convenient that they are allowed. A desirable aim would be to get all controls down to the simplest, cheapest, most efficient and reliable engineering devices possible as part of the general development of the complete craft. The overriding requirement, in any performance sailing craft, of having a high power/weight ratio \V/2 sail area V3 displacement will inhibit the overlavish use of expensive gadgetry on board, and keep design in contact with commonsense and reality. | have discussed these ideas informally with the committee of my club, the Leeds and Bradford Model Racing Yacht Club, and hope they will accept a trophy from me, known as the “Sailing Development Trophy’’, open to anyone to compete in a model equivalent of the “Portland Speed Trials’ with world records in various sail area classes. To avoid the production of useless ‘’freaks’’, speeds are to be a mean of two runs in two directions. This would also allow vane boats to compete on equal terms with radio control. Such a competition would enable full-size and model designers to take design and development “gambles’’ without antagonising their bank managers. Actual details of running and timing the sailing speed trials call for considerable thought, and any suggestions would be greatly appreciated. | would hope to get MYA recognition of the event, and perhaps have winning designs and presentation of the Trophy at the Boat Show, so as to give some real recognition of the winner’s efforts. In order to avoid upsetting yachtsmen who havea real regard for traditional ideas and design, may | point out that relaxing just three rules in, for example, the model Marblehead Class, could produce a better looking and faster yacht. Rules specify overall length to be 50in+or—zin which produces a rather “chopped off’ appearance in profile, in order to get maximum waterline length within the rule. If W/L length were left around 50in but overhang fore and aft were allowed, the result could be a handsome yacht which could sail better in a chop, with the same power to carry sail, perhaps with a lower planing speed, and, with the reserve buoyancy forward, could be pressed harder downwind. It would not offend the “traditional” eye either. The 800 sq in (nominal) sail area in this class can already be stretched (within the rules) to around 1,000 sq in so why not cancel the rule, and let anyone who is clever enough use more sail power? The rule that limits the jib height to 80% of the main is often ignored in full size practice. None of these alterations would add appreciably to the cost of building and sailing a Marblehead. As a happily retired engineer, | am having a whale of a time developing a cat, which can’t be blown over, has an automatic sail winch (controlled by wind-vane), which trims the sails to the apparent wind, radio- control of steering, and using “hydrodynamic” ballast (a hydrofoil) on the keel-fin. This results in an all up weight (at present) of 9lb, with 63 sq ft of sail area, and it’s beginning to sail very nicely. Own design and manufacture, cost to date only a few pounds, and it looks good. | do practise what | am preaching albeit in a slightly more unorthodox manner, but that is my real enjoyment in modelling. |do have two Marbleheads (R/C).” In the past, it has been felt that the 10-rater class gives plenty of scope for experiment, although it excludes multi-hulls. Vaneoperated sheeting mechanisms go back some 25 years, and went out of favour because skippers enjoyed controlling the sails themselves, or felt that skipper-control was more flexible. A difficulty is that existing classes specifically or generally ban many of the ideas and gadgets that might be expected to emerge from such trials, which has possibly been a major deterrent in the past; there is in fact a very good case for such bans. Nevertheless, there are many See this and other machines in our range at the following approved Stockists. Basingstoke Model Centre, 4, Wote Street, Trials might even encourage some ofthe many armchair designers to try putting their theories into practice! What is now needed is an indication of how much support might be attracted, so if you’re interested, why not write either to ‘Log Book’ or direct to David Modeimaker, 181-182, Queens Road, 11, Poet’s Walk, HASTINGS, Hampshire Sussex, TN34 1RO PENRITH, Cumbria Telephone 0256 53559 Telephone 0424 423072 John Hall Ltd R.H 2, Railway Street 150, Chanterlands Avenue, BATH, HULL, Telephone: 0768 5378 Beaumont Model & Miniature Railways, 158, Ashfield Road, ROCHDALE, BA1 1PG HU5 3TR Telephone 0225 4513 Telephone John Jonn Hall Ltd Peter Crisp, Russel! Square, High Street, LEICESTER, LE12DR RUSHDEN, Hall Ltd 37, Whitehouse Street Bedminster, BRISTOL, 8S3 48U Telephone 0272 632847 Telephone: Lancashire 0482 43701 Telephone 0706 45657 Northamptonshire. NN10 SJR Telephone 09334 56424 0533 50671 Balco Industrial Supplies, Aird & Anderson Ltd J. 49, Vyse Street, BIRMINGHAM, 31, Mathew Street, LIVERPOOL, Ladys Bridge 3, SHEFFIELD, L26RE South Yorkshire. S3 86D BI86HJ Telephone 021 554 1026 Telephone: A.J.Reeves & Co. (Birmingham) Ltd Jonn Hall Ltd., Holly Lane. Marston Green, BIRMINGHAM, 837 7AW Telephone: 021 779 6831 Power Tool Services (Southern) Ltd 851, Christchurch Road, BOSCOMBE, Dorset Telephone 0202 420583 051 236 6987 London. EC12 9NL Telephone: 01 739 8301 01 542 6644 A. E. G_K Hadfield, Tickaw Lane Shepshed, 05095 3014 J. Gleave & Son Ltd 34, Llandaff Road, CARDIFF, CFI ONJ Telephone 0222 31367 Gateway House, Telephone. 01 300 7358 169a High Street, STREET, Piccadilly Station Approach Telephone. Somerset 061 236 1840 Newbury Model Centre, 206, West Street, FAREHAM, 9, Oxford Street, Hampshire, PO16 OHF Berkshire, RG13 1JG Telephone Fleetwood Model Centre 185, Lord Street Telephone 31, Kingsway, SWANSEA, SA1 5LH Telephone 0792 55841 0635 49357 39, Percy Street, NEWCASTLE-UPON-TYNE, Lancashire NESS 1HW J.E.Siddie Ltd., 83, Victoria Street, GRIMSBY, South Humberside, ON31 1NJ Telephone 0472 58741 John Hall Ltd Telephone: 03917 5677 Blackgates Engineeri 9 8, Mount Avenue Henry Osborne Ltd FLEETWOOD, Telephone: 0458 46061 John Hall Ltd, NEWBURY, Telephone 0329 234136 Station Road SIDCUP, Kent Somerset Tool Services, MANCHESTER, M1 3AA G.M.H.Bunce & Co. Ltd., King (Tools) Ltd., 3 Central Parade, LOUGHBOROUGH, Leicestershire Telephone. Hindley Ltd., Telephone: 0742 730559 §8-92a Merton High Street, LONDON, Telephone: B. S. Tyzack & Son Ltd., 341, Old Street, SHOREDITCH, Sw19 1BD Ryall & Walters, Wrenthorpe, WAKEFIELD, Yorkshire Telephone 0924 72257 0632 23881 N. Mole & Co Machine T 5, Tolpits Lane 51, Commercial Street, NEWPORT, WATFORD, N PT 1LP Telephone Telephone 0923 43135 Herts. WD1 BLU 0633 58004 Write to us for further information and address of your nearest stockist non-racing sailing enthusiasts who would be tempted by such a proposition, and David’s suggestions provide food for thought. Thorcratt BASINGSTOKE, COWELL OAK ENGINEERING NORWVICH, STREET NORWICH 614521. Manufacturers of LIMITED ENGLAND. TELEX 975205. Engineers Machine Tools. Boothroyd, 33 Gipton Wood Avenue, Leeds LS28 2TA? May 1979 Cc





