The rough rule of thumb is that one HP for each 500-600 pounds of displacement is required
to push a boat to near "hull speed." If the required speed is reduced to S/L of 1.05
from 1.34, one HP is needed for each 1000 pounds.


"Wwj2110" wrote in message
...
Of course it takes almost 12hp per ton to get there.

does this mean that an 18 hp outboard will propell my sailboat at 32 kts?