So far, the replies I have read speak of a change in RPM. My question related to two props with different pitches turning at the same RPM. The replies related to a change in rpm. It is common sense that to move just to move the same amount of air, a 48 pitch would need to turn more rpm than a 51 pitch. Sooooooooo, in order to have better take off characteristics, the 48 pitch must be turning at a considerably higher RPM. My Coupe is in the reassemble stage, else I would put on different props and do the measurements. There must be someone out there much smarter than me that knows of a formular that calculates the difference in air movement. Hold on, I erred, correction, there are many out there much smarter than me.Lee Browning
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