I understand what people say about flex being less efficient, the part about it taking energy to cause the flexing to occur, and no useful work is done on the rebound. I think that applies really well to any kind of flex that occurs as a result of propulsive and reactive forces. On the other hand, in choppy waves, I am quite sure that I can feel the impact with the waves slow me down. It seems that IF flexing reduced the suddenness with which the boat is lifted over a small wave, the end result COULD reduce overall energy wastage. I'm not sure if it's actually possible, and it might only happen during perfect wave conditions, but it SEEMS possible. Of course, a better plan might be to use a boat that slices straight through the wave instead getting knocked skyward. Oh well.
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