Re: whats your Top End on 23s
My old '74 Tsunami with '88 225 Johnson and 100 gal of gas topped out at 36-37 mph at 5400 rpm with an OMC 14.5x17P stainless.
Previous owner had it rigged with twin Mercury 140 inline 6 O/B's with Mercury Trophy props, size unknown. He said he got 42 mph for WOT trimmed out and light on fuel. Sounds about right.
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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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