And with the old wooden oars and sculls, the power face side of the shaft was kind of streamlined, while the non power face, which would drag through the water relative to the blade itself, was flat. Streamlining both faces of the shaft, and getting most of the shaft out of the water, might make a noticeable difference.
But just for sculling in variable conditions, I think I'd rather have the old style symmetrical blades. Those new hatchets must catch wave tops noticeably when the rower rolls the shaft to bring the blade vertical.
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