Iím not sure if this is a technique, building, or design question but I thought I would post it here to get some input.
I was wondering why you never see a sliding seat installed in a kayak or canoe. It seems like great mechanical advantage could be gained by incorporating leg muscles into the stroke. The most obvious concern is that by increasing the length and power of a stroke, one side at a time, you would habitually zig-zag. If that were only problem then I would think that a double (kayak or canoe) with each passenger paddling on opposite sides on sliding seats would exist. There must be another reason that no one but rowers put their legs to work.
I can only guess that the more you push with legs the more your abdominal have to flex to hold you in an upright position and that this is somehow less efficient then a higher cadence lower power stroke. Of course you do use your legs in a stroke by pushing off foot pegs just not in a dynamic way.
Anyone know why a sliding seat isn't used?