=1.55 x waterline length in mph. Do the math for two different waterline lengths and your how faster question is answered. In theory.. The problem is that people cannot go longer infinitely; their personal limit on longer is better depends on how much horsepower they can develop.
Now sometimes you can make a long boat a little shorter by heeling it. I use a fifteen foot boat in mangrove tunnels and can adjust (if I don't get stuck ) the length to make it a little faster turning. I don't like kayak paddles there but that is a different discussion.
There is lots more here by kayak and canoe designer John Winters.
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