Long and thin? Or short and fat?

Whenever you’re in doubt about a theory, just make an example to the extreme, and you will have your answer. Imaging paddling a kayak 5 feet wide and 8 feet long. Then you get in one 2 feet wide and 10 feet long. You are plowing less water (you are creating less bow wake) and the narrower boat cuts through the water resistance with less energy.

Now if the person weighs 200 lbs. and you make the 2′ Wide x 10′ long boat a little longer, the boat sinks less deep in the water and will take less energy to propel it. The ratio of less resistance outweighs the increased surface friction. There will be a point when the surface friction resistance will gradually outweigh the gain that the increased flotation will deliver and then that is it, unless you start rounding the bottom more and on and on. Then you sacrifice stability for less surface and gain speed again.

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