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Old 18 March 2010, 06:17   #11
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Country: Australia
Town: adelaide
Boat name: tba
Make: custom
Length: 7m +
Engine: outboard,200+
Join Date: Mar 2008
Posts: 71
another rule of thumb is
Divide the mass of the rib in pounds by 25 gives hp for a single engine.
2200lbs /25 = 88hp

divide the mass of the rib in pounds by 40 gives hp for twin engines. this gives similar performance as the single engine.

2200lbs/ 40 = 55 hp X 2 total of 110 hp.

regards
rpm
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