Join Date: May 2005
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Re: Repower confusion (horsepower)
While I have not had to power boats, Figuring out how much HP to have in a dumptruck for various and sundry reasons have come into play for what I do. Realty is, some boats, just like auto/trucks will be easier to move at X knots than another. Weight is not always the key. It may be in auto terms, aerodynamics that can add or subtract 30% off a base HP needed to move something.
In out boats cases, I would swag, type of prop, even the actual weight of the prop could vary the HP needed. It takes MORE hp to move say a 5lb prop than a 3 lb prop. That extra 2 lbs of prop, could be equal to 1000 lbs of actual sedentary wt on the boat, because the prop is turning, vs sitting there!
The HP amount, could also vary based on the torque the motor is producing at the time, along with trans reduction.......so many varables that ones head could spin.
At the end, which motor you choose, its up to you. For around here with our currents, more HP might be better per say.
She drives me boat,
I drives me dinghy!