Join Date: Dec 2005
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You have asked a complex questions, to which there are varying answers. If you do a search on this website, you will find several posts comparing feathering and folding props, and also some pointers to websites where they compared feathering, folding, maxprop, 2 blade and 3 blade props for resistance while sailing and for thrust in forward and reverse while motoring.
As I recall, the best were the folding, followed by feathering, then 2 blade, then 3 blade for least resistance while sailing, and I think in reverse order for motor thrust.