'89 Starcraft 22ft American Express Dry Wt 2750 lbs. AQ170C/270 power/io. Came with a 15x15L prop. I had to replace it after some rock climbing with a 14x15L. With the new prop it was running 25mph GPS at 4000 RPM. These are supposed to run 25 mph @ 4200-5000 but I could never get this performance out of the 15x15. Well, more rock climbing (tough area) and now had to use a 14x12 for the weekend. 17mph @ 4200 rpm. So shopping again, should I go 14in or 15in dia (think I'm staying with the 15 pitch)? What difference would/could 1in in diameter make?
Thanks
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