History of Propeller

	Revision 5 . . September 27, 2001 6:11 am by Lnuss
	Revision 4 . . (edit) September 1, 2001 12:55 am by Mike Dill [relink to wing, minor edit]

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Difference (from prior major revision) (no other diffs)

Changed: 1c1,5

A propeller can be seen as a rotating 'fin in water or a wing in air. The horizontal axis of rotation produces a dynamic force as thrust?. The force produced is from the difference in pressure from the forward and rear surfaces of the blades.

A propeller can be seen as a rotating fin in water or a wing in air. The horizontal axis of rotation produces a dynamic force as thrust?. The force produced is from the difference in pressure from the forward and rear surfaces of the blades. On an aircraft, the propeller is an airfoil?, much like the wing of an aircraft, except that the shape of the airfoil? varies continuously throughout the length of the blade. The tip of the propeller often operates at or near the speed of sound, causing a raucous noise. The propeller is usually attached to the crankshaft of an engine, either directly or through a gearbox?.