This is man to man dogfight in a control line version.
Top Pilots, E/Ch '97:
A Beliaev, RUS
Mats Bejhem preparing for a Combat bout. (40k)
In a circle laid over grass two pilots fly models that have strings with paper streamers attached to the tail. The object is to cut the opponent's streamer with your propeller, and to stay airborne. In the international class, F2D, the pilots are assisted by two mechanics each and are allowed one spare model per bout.
Model configuration is a flying wing with around 1 meter (3.5 ft.) span, construction is a spruce/styrofoam/balsa frame covered with mylar film. An elevator is attached directly to the wing trailing edge. With a good serial production strategy the building time of a model could come down to 8 hours. Fuel tank is made from latex rubber tubing that is inserted into a compartment in the wing and pumped with fuel to resemble a frankfurter. This 'tank' will give a constant overpressure of around 1 atmosphere to ensure that fuel is fed to the engine in all maneuvers. Model weight is around 400 grams (14 oz.). Engines are 2.5 cc glow plug type developing around 1 bhp at 30,000 rpm on a standard fuel of 70% methanol, 10% nitromethane and 20% castor oil. Lines are of 15.92 m length. (52.2 ft.)
Combat models could be the most maneuverable things made by man. (Using the number of controllable g:s as measure.)
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