A prop is just like a wing as it has a best angle of attack for the lowest lift
to drag ratio. In a prop the best lift to drag ratio gives the best
ratio of HP out over HP in or prop efficiency.

OPPS   I should give up when I am sick like this. 
That should have been.

"A prop is just like a wing as it has a best angle of attack for the highest lift
to drag ratio."

Paul Lamar
 
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