Yesterday somebody gave me the formulas to calculate the prop tip speed. I did some calculations and looks like us with the 2.17 redrives are kind of painted in the corner. Hope I'm wrong, but if I want to keep the tips from going supersonic, I have to cut down the prop to 64" or keep the engine below 5500 RPM. The choice is either inefficient prop and adequate power, or efficient long prop and not getting all the power from the engine? Am I wrong?
Buly
atlasyts@bellsouth.net