Overpropped; What to do? - Page 4 - SailNet Community

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  #31  
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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Old 04-20-2013
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Re: Overpropped; What to do?

NO NO NO

It is a motor with mechanical fuel injection which is THE problem being resolved

The mechanical fuel injection system will input excessive fuel based on throttle setting regardless of the RPM the motor makes

The extra fuel does bad things to motor and it is as simple as that


Any displacement hull will have a Huge prop slip number due to the need to NOT drag a bucket size prop through the water when sailing
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Last edited by tommays; 04-20-2013 at 07:02 AM.
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