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post #31 of Old 04-19-2013
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Re: Overpropped; What to do?

The sweet spot is hull speed and maximum torque without current and head winds. Resulting in a smaller engine to supply the needs.
Max torque is at a lower rpm on electric motors, diesels and then gasoline engines, in that order.
I've been thinking that Bombardiers new passenger jet, is gearing the turbines prior to the combustion turbines, in an effort to reach maximum torgue at the desired cruising speed.
Pitch is a combination of the angle of attack of the blade and its surface area. If you cut only its surface area, theen the blade will achieve a lesser distance thru the water than before it was cut.
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