94 MPH 
http://www.boatsandoutboards.com/view/F30221
I reckon my boat must do at least a ton then, 110 down hill

http://www.boatsandoutboards.com/view/F30221
I reckon my boat must do at least a ton then, 110 down hill
Ned said:Theoretical top speeds can be easily calculated. Just take max revs X(times) propeller pitch/(divided by) gear ratio X .0094976. Multiply by the inverse of prop slippage (typically 75 -85% for a performance type monohull) and there you have it in mph.
Ned said:94 mph possible but unlikely.