MODEL AVIATION

New Zealand Herald, Volume LXXI, Issue 21912, 22 September 1934, Page 4 (Supplement)

MODEL AVIATION

Stinson Monoplane FLYING SCALE MODEL No. XXXI.

In constructing this high-wing monoplane the first thing to do is to make a full scale drawing of- the plan and side elevation of the fuselage. Do this carefully and you can then dispense with dimensions by cutting all parts to plan size. Build up the left and right sides of the fuselage simultaneously, one on top of the other. The fuselage is 20iin. long by 2Jin. wide by 3Jin. deep, tapering toward the tail. When the two sides are completed place in position on the plan drawing, with the top longeron down. Make sure the sides are vertical, pin them in place, and fit and cement the cross members, cutting the latter in pairs, as they are the same length top and bottom. The wing-clip beam is the centre <me of three longitudinal »members above the cabin. This should be made of hard balsa or pine, so that the wing clips will not bruise the wood too much. Now cut the nose block to a true circle of 2in. diameter and cut out the Jin. centre hole to take the Jin. x Jin. motor-stick. Shape the front motorstick clip from 27 s.w.g. piano wire and cement to rear of nose block. Sand off nose block with glass-paper and cement in place, damping the longerons to facilitate bending. Undercarriage The entire undercarriage is built of l-16in. x Jin. bamboo. A full size plan of the front view should be drawn

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and the bamboo cut to length ar.d built into position. When the model is in flying position the bottom of the undercarriage and • J,he tip of the lOin. propeller will both touch the ground. The addition of the wheels gives sufficient clearance for the propeller. At the points where the undercar. riage struts meet the fuselage an additional small block of balsa can be cemented in place. Then the bamboo struts can be cut to a point, forced into these small balsa blocks and cemented in place c When cementing bamboo to oarnboo the parts should be bound firmly with thread and cement added over and around the thread. The 2in. diameter wheels are made of two circles of l-Bin. balsa cemented together, with the grain of one piece set at right angles to the other. Axle < bearings can be made from wrapping paper round a needle into a thin tube, with just enough diameter to revolve freely round the axle. Seal- the paper tube, cut to length end insert and cement in the exart centre of the wheel. The front axles are made from 21 s.w.g. steel wire and shaped with a single loop, as illustrated last week. This loop absorbs a certain amount of shock in landing. Bind the wire axle to the front strut and bind and cement the struts firmly together where tbfsy meet, adding a small balsa chock to strengthen at this instructions for the Stinson model will follow next week.