Join Date: Mar 2008
Location: Oslo, Norway
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Craig, your hullspeed is 6,7 knots (through the water), squareroot(1,34*34). It is more or less imposssible for your boat to go faster than that. The question is, what is the maximum rpm for your engine? Because it is at this maximum that all the capasity is used. If 2100 rpm is the maximum rpm that your engine can bear, and the speed is between 5 - 6 knots, than either your engine is a wee bit too small, or you need to clean it under the waterline. (provided the engine is working properly and that the propeller is the correct size with the correct pitch).
Anyway, you should aim to go about 1 knot slower than the hull speed, that is around 5,5 knots in your case, that is good for the economi end the engine.
Use your head, ram the wall till it falls.