World Record Twin Pusher

New Zealand Herald, Volume LXXI, Issue 21396, 20 October 1934, Page 4 (Supplement)

World Record Twin Pusher

Here ie a twin pusher spar model of recent design, that holds the world's record in its class under the new weight rules. This model assures you flights of long duration consistently, and any boy can build it with the knowledge that when it is completed he will stand a good chance of winning any outdoor spar contest. Construction is quite straight forward, but demands a little more care than is usually bestowed on twin pushers, because this model incorporates certain refinements that play their part in achieving outstanding P® r ~ formance. Unusual features include double-surfaced wing and elevators with proper aerofoil sections, fuselage cross-bracing and free-wheeling device. The main items required in the construction of this model are as follows; (2), l-Bin. x 3-Bin. x 40in. hard balsa. Ribs (45), l-16in. sheet balsa. Spars, l-Bin. sq. balsa. Bamboo, 9ft. of l-16m. x l-16in. Propellers, 2 medium balsa blocks lin. x x lliin. Superfine tissue. Piano wire, 19 and 21 s.w.g. Dope. Balsa cement. Rubber, 10 strands of l-Bin x l-30in. flat rubber for each moter. Fuselage The longerons used for the V frame of the fuselage are made of two l-Bin. x 3-Bin. x 40in. hard balsa lengths. Sand them down to the cross-section, shown below, and apply a coat of dope. Secure a really smooth finish by a further gentle rub with No. 0 glasspaper. Now stand the two lengths on your workbench, with the ends llin. apart, and cut the two top ends diagonally so as to make a perfect joint when cemented and bound as illustrated. A strip of bamboo is placed at the other

BUILD THIS No. XXXV.

end of the frame to keep the longerons llin. apart. Attach by pointing the bamboo and piercing "the longerons about J in. from the ends, finishing -with an application of cement. The next step -is to put the l-16in. sq. bamboo cross bracings in place. Cut two lengths of 9}in. and two of 6in. and attach these also by pointing, piercing and cementing; when in place put a strong cotton lashing at each cross. Rear Elevator. The rear elevator is built on the fuselage. Cut nine rear elevator ribs to the full scale section shown below. Now cut the leading edge from l-Bin. sq. balsa, sand down to the section shown and cement in place, leaving just enough space between, this spar and the trailing edge to ensure the ribs fitting snugly. Place the ribs lin. apart aad cement. A piece of l-Bin, sq. balsa tapered to l-16in. x l-Bin. is next cemented against the longerons, between the leading and trailing edges, with the thickest end forward. These pieces provide a working edge for the tissue covering. _ Do not corer this surface until all wire fittings are attached. Model enthusiasts will be interested to hear that a group of Auckland bodies, controlling all popular fields of model construction, has combined to organise a comprehensive exhibition of models. Working and scale models of every description mil be exhibited at the old Dixieland building on Friday and Saturday next. Full particulars will be advertised at an early date. Further plans and instructions for this model, will appear in next week's article, which will, also be the concluding article in this model aviation series.