Re: What propeller for a 23' Sceptre?
If I assume that when you said 550 rpms, you actually meant 5500 rpms, then you should be right on.
5500 rpms, with a 1.75:1 gear ratio, turning a 15" pitch prop, assuming slip ratio between .10 and .14 , works out to a top speed of about 38-40 mph, which is pretty good for a 23' Seacraft with a single 225.
My 23' Tsunami with a single Johnson 225 turned 5900 rpms with a 17" pitch prop behind a 1.85:1 gear case, and topped out at 39-40 mph. But I hardly ever went above 28-30 mph.
With a bracket, I strongly suggest you need trim tabs, and someone to teach you how to use them properly if you don't already have that skill.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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