Re: performance of twin 150's on 23
Back in late '84, the Palm Beach Police Dept had a 23 SF with twin Evinrude 150's, transom mounted, and the only way it would plane with one engine was with the tabs full down, and the non-functioning motor full up and in calm water. Even with all that, it really struggled to get on plane, but did so eventually. With both engines it topped out at about 44-45 mph.
After toasting two powerheads in two months, they repowered the boat with twin EverRude 235's which, like the 150's, were provided for them free by OMC's testing facility in Stuart/Jensen Bch. Planing on one engine then became easy, and top speed was raised to 58-60 mph. The boat was serviced at Rybovich/Spencer Marina and Boatyard where I worked for a time.
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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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