Next message: Alec McLocklin (amclockl): "Re: T&T: Realistic horse power for boats (was 3160 Cat Diesels and Repowering 20 Ton Boat)"
In a message dated 5/22/07 12:01:07 AM, Arild writes:
> Naval architects have reliable formulas backed up with tank testing that
> show exactly how much power is required to move a given hull at a specified
> speed. In the case of a true full displacement hull, we know exactly how
> fast that hull can move at maximum speed.
>
>
The usual NA rule of thumb figure for propelling a displacement yacht at hull
speed is 1 hp. per 500 lbs. of displacement. Add 20% more power for
emergencies and that's all the power the boat can reasonably use. Of course if you are
unreasonable, the sky's the limit.
Larry Z
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