Thanks for the links MG but I'm a little confused now. My existing prop is 13.5X17P and wot is 5500 rpm as per Yamaha specs, if I go to 4 blade shouldn't I drop in pitch or size ? (The trophy plus link is for a 17P !) and if I go with a black max/diamond would it be ok to drop to 15P instead of 17P ?
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