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Old 07-03-2020, 05:15 PM
bigeasy1 bigeasy1 is offline
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Join Date: Jul 2006
Location: western massachusetts
Posts: 1,048
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I have a 1974 23 Tsunami (aka Sceptre) powered by a 350 C.I Mercruiser with a single Alpha outdrive,with a 15x17 SS prop.

My numbers are close to yours(a bit lower) On a normal day with mild wind and water conditions I'm at

2500 RPMS...........22 MPH
3500 rpms............30 MPH
4600 (my wot).......38 MPH

This is with a full tank of fuel (55 gals) 3 people and lots of tackle and a full cooler of fish. and stand up canvas work that restricts speed to a noticeable degree.
not a rocket ship for sure but fine for me. I rarely run above 2500 rpms. The fastest i've ever had it up to was 41 mph.
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All this,just for a boat ride
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