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Old May 16, 2002, 11:46 AM
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Williamsville, NY, USA
Joined Sep 2000
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A quick estimate of the power required to turn the prop can be found by:

P = ((dia/12)^4)*((RPM/1000)^3) * (pitch/12)

So, for a 12 x 8 prop turning at 5000 RPM, the power required is:

((12/12)^4) * ((5000/1000)^3) * (8/12) = 83 watts

The most critical term is the diameter. Double the diameter

((24/12)^4)*((5000/1000)^3)*(8/12) = 1333 watts or 16 times the power
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