Re: 24 ft SC
Back in February 1984, I rigged a SeaVette with new twin 235's prepped by 2nd Effort, including nose cones and low-water pick-ups, and we added K-planes. Both RH rotation motors back in those days.
We could get an indicated 71-72 mph on an AutoMeter marine speedometer. This was achieved running early in the a.m. while it was cold. We had projected 74-75 mph, but we were unable to achieve that as rigged. Speeds later in the day fell to 68-69, and further loading 4 people and full fuel late in the day dropped it to 66-67 mph. Fuel consumption was about 51-52 gph at WOT.
The other boat we were rigging with 2nd effort motors at the same time was a 25'5" Checkmate with identical engines. The balsa-cored Checkmate weighed nearly 1100 lbs less, but was only 4-5 mph faster, and in fact had to run slower offshore in 2'-3' seas. With a good throttleman, the SeaVette could run WFO (64-65 mph) even in 2'-3' seas.
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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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