X-Mozilla-Keys:                                                                                 
I forgot to mention the calculated  HP required in 
the climb is the HP out of the prop. 

If the PSRU and prop overall efficiency is 80%
then the HP required out of the engine will be: HP out of the
prop divided by 0.8 or about 90 HP in Jim Mosur's example.

This goes for cruise too. Cars transmissions generaly are
closer to 90% efficient.

Paul Lamar
 
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