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Joe,
I appreciate your input and I understand about staying with the same manufacturers blade design. I just added the blurb about staying with Power Tech so I wouldn't have to fend off any advice for other manufacturers props for this very reason.

Tedious,
I thought diameter was also governed by the size prop that would fit on the gear case. I guess then my next question would be why prop manufacturers including Yamaha make multiple diameters from 13, 13.25, and 13.50 for my F70.
Will the lower pitch improve top end? It seems like the higher pitch would have a higher top end but a longer planning time while the lower pitch would have a shorter planning time but a slower top end speed?

Jim G.