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Onishi OS-G3
 
Designed and built by Mr Onishi, a Japanese sailplane pilot, the OS-G3 single-seater is powered by six model aircraft engines, mounted three on each side of the nose on a strut braced boom in line with the front of the cockpit canopy; these engines are intended to overcome the need for winch-launching or aero tows. Each 10cc OS.60 two-stroke glowplug engine drives a 12in diameter two-bladed propeller and develops 1.7hp at 14,000rpm, or 1.275hp at a less noisy 8,000rpm, the six together producing a total of 10.2hp for take-off, or 7.65hp for cruising flight. This is just enough for an unaided take-off, the take-off run being about 500ft when the OS-G3 made its first flight early in 1977. This power output leaves a 3mph margin between the cruising speed of 24mph and the stalling speed. The payload was only 154lb.
 
The OS-G3 is a cantilever shoulder-wing design with a swept back fin and rudder and the tailplane mounted on top; the engine slipstream is in line with the wing leading edge. There are no flaps or air brakes, and the landing gear consists of a fixed monowheel, a fixed nosewheel and a tailskid. The pilot sits under a one-piece canopy, and has six throttle levers and six cut-out switches for the engines.
 
Span: 46 ft 3 in
Length: 21 ft 3.5 in
Height: 5 ft 2.5 in
Wing area: 185 sqft
Aspect ratio: 11.6
Empty weight: 143 lb
Max gross weight: 297 1b
Cruising speed: 24 mph
Stalling speed: 21 mph
 
 
 
 
 
 


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