Check out the paddle calculator at www.wernerpaddles.com
Length is determined primarily by boat with, and to a lesser extent by how tall the paddler is. You need a paddle that is long enough to allow you to comfortably get the entire blade in the water on each stroke, while sitting up straight. In a 31" wide boat, you'll need at least a 220 cm paddle, and possibly a 230, in my experience.
Wall Mount Boat Racks
Full Size Sail Rig
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