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Three to four horsepower per ton. This is more than necessary to attain hull speed, but you could need the extra for headwinds and waves. If the boat weighs 3000 pounds, then figure 4.5 to 6 HP. If you want to calculate speed in knots, take the square root of the horsepower, multiply by 15 and divide by the beam. Say you have an Erickson 23 with a 7.9 foot beam and 4 HP engine, which gives 3.4 knots, but you should probably go with 6 horsepower for this 3200 pound boat in bad weather.
Last edited by LakeSuperiorGeezer; 12-23-2010 at 08:46 AM.
Reason: Miss calculation