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Most direct drive A4s take a 12" prop with 2 blades, pitch about 7". Pitches were higher in the past (9" or so) but current thought is to use a lower pitch for more RPM. Some folks are using 3 blade props - perhaps one of them will give some insight.
Not sure what direct drive will do for a 36' Columbia - that's a pretty heavy boat. Doubt if you'll be thrilled with the results. Why did you change from the reduction gear?
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