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Another way of looking at this issue is the analogy of turning a drill bit through a piece of wood
vs. pushing it through. If the speed of the freewheeling prop can match that of a 'screw' going through the water, it seems like that would have the minimum drag. If the speed is considerably different, it would have the effect of pulling an almost flat object, the diameter of the prop, through the water, causing appreciable drag. Seems like self-feathering props are designed to fix this problem, and outboards taken out of the water while under sail, both try to minimize drag. Sherwin D. |
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