ROTARY ENGINE - A powerplant that rotates on a stationary propeller shaft.
Rotary Engine: A radial aero-engine in which the crankshaft is stationary and the cylinders revolve, carrying the propeller on an extension.
Rotary engines have fewer moving parts that piston engines, so they are generally more reliable, and they operate more smoothly. But they are also less fuel-efficient as a rule, and they emit more pollution.
Rotary engine in motion
Piston engine in motion
You will also find in the right hand a study regarding rotary engine for Hovercraft which was done in the early hovercraft days -
Enjoy Michael ...
ROTARY ENGINE - Cylinders disposed as for radial engine, but in this case the crankshaft is fixed, and cylinders and crankcase rotate around it.
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Search for rotary engine books on Amazon.co.uk
Rudder
The moving part of the vertical tail surface of an aeroplane which provides yaw control.
Caudron G3 (1913) reproduction, with original upper right wing panel, cowling, various instruments and its original LeRhone rotary engine.
Curtiss 'D' Pusher (1911) reproduction a/c, s/n 1976, N68014.
Early helicopter designs first utilized custom-built engines or rotary engines designed for airplanes, but these were soon replaced by more powerful automobile engines and radial engines.
 See also: Power, Rotary, Plane, Flight, Aircraft
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