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DECEMBER 1967 Recommended Maximum Price \ ae \ TWO SHILLINGS AND SIXPENCE U.S.A. & CANADA SIXTY CENTS HOBBY MAGAZINE + her) Py ale : F*? Sad Xi . —_— . _. PR T —a Fore pre o*eala, afi Hey! Get this NEW new Ambassador Maths set by FROM BILLING BOATS Don’t be the chap who’s always borrowing equipment. Get your own gear. It’s all in the Ambass — ador compass, divider, 6 inch rule, pencils, ball-points, sharpener, eraser, pro- DRAGON CLASS YACHT A 1/12th accurate scale model, 31 in. in length, of the beautiful Dragon class, the best known example of which is the Duke of Edinburgh’s Bluebottle. This superb model, 42 in. high, is plank-on-frame construction and is splendid for display or sailing. Care and thorough preparation of all aspects of the kit ensure straightforward tractor, set squares, chemistry stencil—the lot! Vv. All for 19/11 \S These other se7s construction are fab too! 6” rule, drop-action pencil, eraser, ballpoint, pencil sharpener, pencil, protractor, set squaies, and blotter. \ jj 69/6, CONTARNEX 29/9 TIME & CONTROL LTD. Dept.BB, 42 SYDENHAM RD., CROYDON, SURREY Belt along to your Helix shop now! Better still, take your Dad along to advise you—he’ll probably fork out! i price A complete illustrated list costs 1/6 from the distributors and sole importers. Spring bow compass, precision compass with pencil and divider attachments, refill leads, pencils, 6 inch scale, eraser, protractor and set squares. 2]1/- “MODEL kit to the latest tugs and coasters, are included in the range. VISCOUNT MENTION Basic board “‘on the kitchen table’. Period and modern sailing ships, and power craft ranging from a 100 year old paddler Spring bow compass, technical drawing compass with divider and pencil attachments, refill leads, 6 inch scale, drop-action pencil with refills, eraser, pencil sharpener, KINDLY results. accurately prefabricated, and can be built on a building Compass, THE HELIX (UNIVERSAL) CO. LTD., LYE, STOURBRIDGE. elegant All Billing Boats are of ply and hardwood construction, NEW SUMMIT erasing shield, protractor and set squares. and complete accessory pack of metal fittings 45/0. We also import the well-known Futaba radio control equipment and will gladly include details with your Billing catalogue if requested. Available in leading Model Shops Tel: LYE 2552 BOATS” WHEN ny REPLYING TO ADVERTISEMENTS DECEMBER 1967 ROUNDELAY A one-metre l.o.a. design aimed at (though admittedly efficient) Marblehead and 36R look which does not attract all would-be yachtsme n. We were thinking in terms of one metre length, 75 attractive appearance and radio control if required. Could fit with minor per cent waterline or thereabouts, and, say, 5 adjustment the DF and DX classes. kilos in weight. A couple of designs were roughed out before we abandoned the scheme in favour of the Starlet design. There is, after all, the Internat ional 10/40 Class, though this seems to produce some incredibly ugly models, and, anyway, the idea for such a radio class would hardly be successf ul unless it was developed in a club and moved through the appropriate national body. We think there is a need Model in tures is Holloway’s the pic- 6 R. for such a class, and the popularity of the 34 in. Starlet design, which still astonishes us, seems to indicate that the interest is there. However, our roughs were stuffed into a drawer and forgotten until two or three readers wrote in asking for a model fitting this general description. They were each offered copies of what has since been named Roundelay, and three have been built. The owners liked them and we get repeated requests for a non-class model of about. this size, sO we thought that other builders may like the opportuni ty. No further development was put in on the design, which deliberately kept sail area down and used a low aspect ratio, the original idea being that radio Petra, weight would have to come off the ballast weight and no change of suit was envisaged, so that too great a sail area could cause unnecessarily steep heel; as a free-sailer, though, the model is fairly stiff and could easily carry more sail, and the amount of freeboard allowed, to help keep the radio dry, is adequate for all purposes. As draughted, the displacement built to this design. Attractive appearance is, we think, demonstrated by these photos; performance seems very happy, too. GOME eighteen months ago, following some corres- pondence regarding a small class of yacht for radio, coupled with a number of requests for a smallish yacht with overhangs for purely sport sailing, we had the thought that a class of modest dimensions and attractive appearance might well encourage international R/C vacht sailing. A portable model, inexpensive to build, big enough to take, say, a pound and a half of radio gear, could well appeal, especially if it got away from the plumb-ended came out at 10 Ib. The step causing most trouble for beginners is the interpretation of a lines drawing, so we have shown the planks for bread-and-buttering the hull. Following this system (¢ in. timber is shown since 1 in, nominal usually planes down to this size) it is only necessary to trace and cut the planks and glue up with Aerolite or similar, keeping the station marks aligned, then carve to shape. Obechi would be a good timber to use, or yellow pine or Western red cedar if avail- able. A hull thickness of } 503 in. is allowed, but it: uw -WN” could be thinner. The bare hull shell should weigh 2-24 lb. Deck beams of } in. material and a 7s in. ply deck are suggested; the fin core can be } in. or slightly thicker, tongued through the bottom plank . KEEL 3/8 MARINE PLY and braced inside. Rigging details as for Starlet in . SLOT TO PICK UP WITH BULKHEAD SLOT last June and July issues etc. are suitable, or those . DOVE TAIL TO PICK UP WITH FIN DOVE TAIL following can be employed. . EXTRA MATERIAL LEFT ON RUDDER FOR JIG DRILLING 1/4 HOLE One of the builders of an existing model was . 3/8 TUBE WELDED TO 1/8 PLATE TO DRILL P. R. Holloway, whose model is shown in the photoRUDDER HOLE graphs and sketches. The construction is a little ~)\. unusual in using strong ply frames and keel with s in. balsa planking, but hardwood planking could WLI be substituted or the completed hull covered with 1. FEET TO BRING WL 1 CORRECT WHEN JIGGING UP nylon or even glass tissue and resin. Stages in Mr. ON BUILDING BOARD Holloway’s model were as follows. 2. 3/8 x 1/4 THICK MARINE PLY 1. Cut keel from } in. ply and saw and/or file 3. SLOT TO PICK UP WITH KEEL SLOT slots for bulkheads. 1. DIAGRAM SHOWS HOW BULKHEADS ARE FITTED 2. Cut bulkheads from } in, ply, fret out to 3 in. 306 AEROLITE WITH TO KEEL, GLUED outline width. Note that outside line must be traced off body plan and thickness of planking allowed for. Cut slots to engage keel. Feet on BULKHEAD bulkheads measured from the first full waterline, PINS PRESSED INTO TWO PLANKS AT A TIME , 1 sar” 2. NEXT STAGE IS PLANKING WHEN ALL a BULKHEADS ARE FIXED. PLANKING STARTED FROM WL 1. THE FIRST 1/3 ARE 1/4 x 1/8, NEXT 1/3 ARE 3/16 x 1/8, LAST SECTION 1/8 x 1/8. THIS ELIMINATED oe SMALL SECTION OF PLANKING MAKING TAPERED PLANKS =a 1. DOVE TAIL TO PICK UP WITH KEEL 2. DEAD WOOD CEDAR 3. 3 Ibs. OF LEAD EACH SIDE 4. MIDDLE OF FIN 3/8 MARINE PLY FIN Ma 2 3 —~_JIB RACK. 16 S.W.G. BRASS SILVER SOLDERED EVE FOR t__.~~ RIGGING 3. Bulkheads are now assembled to keel as shown, on a flat and true building board. 4, Planking starts at WLI, with a } x 4 strip each side glued (and on original, screwed) to SECURED INTO BOOM SCREWED INTO MAST ‘a f a 5/8″ ! 1 Feel \ ~ th——45 WITH ARALDITE ¥ | 2.1/2″ ‘ | A. to shape. 6 B.A. WASHERS garboard. Fin is # in, ply; thick sheet lead can 3. 1/8 BRASS ROD EYES MODIFIED SLIGHTLY be screwed each side and shaped. Remainder of fin built to thickness with cedar or similar and FOR GOOSENECK FITTING sanded to shape. MAIN BOOM 6. Remove boat from board and saw bulkheads were left in for strength. 3/8 DOWEL FOR FIXING KICKING STRAP AND MAIN SHEET 1 to take deck fittings. *=KEY RINGS JIB BOOM r off feet; 7. Cedar blocks are now fitted between bulkheads 20 GAUGE BRASS Me bulkheads, butting against keel fore and aft. Next plank is butted against first and pinned as shown. When all planks completed, balsa blocks are added at bow and stern and sanded 5. Position fin, engaging dovetail etc., and complete 1. 16 S.W.G. FEET FOR HORSE 2. i.e. bottom line of plank B, referred to as WLI in sketches. 1/4 DOWEL + = SCREWEYES 1 aS = 8. A + in. sq. inwale is glued round inside of hull Sa, to provide ample glue area for deck, 9. Deck is 7s in. ply. 0. A hatch is needed in the deck, sufficient to pass one’s hand, plus a watertight cover. HOOK oy LONG 504 DECEMBER 1967 11. Decks on original were lined with tool as illustrated in “Boat Modelling’, p. 53, fig. 149. Deck was varnished except for king plank and outer edge. 12. All fittings (see sketches) were screwed to deck, into support blocks. 13. Mast was ? in. aluminium tube and was not made adjustable; position shown on drawing gave good performance. 14. Two shrouds and a forestay separate from the jib were used. 15. The vane gear on p. 48 of “Boat Modelling” was fitted, feather 5x rudder size. 16. Boom fittings are sketched. One other point may be of interest to potential builders, relating to the fin and lead as originally envisaged. This has a completely straight profile and a constant thickness; although shown with a round- ed bottom edge the first rough showed sharp corners. The idea was to develop the shape on to a sheet of dural of 26-28 s.w.g., cut and fold it, and Araldite the trailing edge. A ply base and a strong vertical strut running up the after lead line would enable 6 lbs. of lead to be poured straight in, or even fine lead shot could be used, The empty spaces remaining could be filled with expanded polystyrene and the strut carried up through the hull for stiff mounting, the top edge of the dural plugging over a garboard fashion piece. This seems a simple and efficient idea and some builder may like to try it and report on its efficiency for the benefit of others? Full-size copies of the drawing below are available, price 10/- inc. post., from Model Maker Plans Service, 13-35 Bridge St., Hemel Hempstead, Herts. Note that no rigging or fitting details are included. Cy) Vic Smeed (9%) | THE MODEL MAKER PLANS SERVICE mick AMEE Me. mOWOSTEAD. veNTS i | | | | ; | |
