wrote:
Is this idea commonly accepted?

http://www.oneoceankayaks.com/kayakpro/kayakgrid.htm

Well, a 15' downriver racer is faster than a 17' touring boat, maybe.
But this is like saying that a VW Beetle is faster than a Porsche 911
because the wheelbase is shorter.

This site does do a very interesting job of trying to explain some of
the forces that are brought to bear on a kayak.

MJ