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> the culprit for increased drag was skin friction You raise the question of whether Teflon-coated rotors might have improved the efficiency... but isn't the s
by adonovan 3y ago
> the culprit for increased drag was skin friction
You raise the question of whether Teflon-coated rotors might have improved the efficiency... but isn't the skin friction also the source of propulsion? Would eliminating the tendency to "drag a great deal of water up" also eliminate the tendency to make headway?
- rokkitmensch 3y agoDevil's bargain. The friction losses you save in dragging water up are more than compensated for by the loss in propulsive efficiency.