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I've currently got a 240 cm paddle. I previously had a 220 cm paddle, and I'm certain that it was too short, because my hands were hitting the side of my boat when paddling, and I was making an awful lot of noise. Having read this article, I'm considering a 230 cm paddle. I really like my Bending Branches Stealth Dream Carbon Composite paddle, so I'm going to have to try it in a 230 cm version. Anyway, if you're interested in physics, the link above is a pretty simple example of applied physics, and an example of something people rarely think about when they're wasting energy paddling around in arcs.