RE: Borg Warner velvet drive question
"I have been told the four blade would be more efficient."
Efficient can have a lot of meanings.
For slow cruising a 2 blade would be even better than the 3 blade , IF you could swing the prop diameter .
IF your current prop is not loading the engine properly at Flank, you may gain a bunch more Knots , if that is your "efficiency".
Yes, there were 1 bladed aircraft props , way back , with a balance weight , but a big diameter is easy on a small aircraft with a puny motor.
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