Maybe I should elaborate a bit more.

What we are trying to say is that it depends on a number of factors how fast a boat will run with a certain type of motor.

If you put a 540 motor geared down in a 18" Deep Vee, it will do 10-15 Mph, depending on the weight of the cells used, water conditions (chop or glass) and general setup.

The same motor in a rigger, (direct drive is possible) will go easily twice as fast, probably much faster, but you need smooth water, as a rigger does not handle chop very well.

Better?

Regards, Jan.