Re: prop question, do rpm matter?
Is your fuel burn rate the same for both props at 4000 rpm? Since the WOT rpm is different, you're probably giving it more throttle to get the same rpm out of the fatter prop. If my miscalculations are correct, the prop that tops out at 5000 is at around 76% throttle at 4000, the one that tops out at 5500 is at 68% throttle at 4000.
And you probably already know you shouldn't run a prop that won't reach the recommended WOT rpm range with the boat loaded. If you're at 5000 rpm with an empty boat, that alone may disqualify the prop.
Dave
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Blue Heron Boat Works
Reinventing the wheel, one spoke at a time.
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