Join Date: May 2006
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i still think the example there doesn't fit the problem here.
for starters, the propellers on aircraft don't spin free. because they are usually atached directly to the crankshaft of the engine, a windmilling propeller has to overcome the engine's internal friction and compression. the power needed to do this produces drag.
as solution the blades are turned so they don't produce spinning force at all, reducing drag to the minimum.
it doesn't address the problem of a nonfeathered propeller spinning with no friction, or almost no friction, as only the friction of the bearings has to get overcome. and neither does it address the drag of a nonfeathered propeller stopped by a brake.
Last edited by Tea-Rex; 05-14-2006 at 08:26 AM.