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I have messed with ducted fans before, and didn't notice an efficiency by squaring off the blades. Might be more efficient by leaving them full length, like high aspect ratio aircraft wings. Also On wind turbines, there is a trend towards longer not wider blades.
This is moot if your props are typical boat wide blade ones. My experience is in aircraft.
Actually your reference points towards a flat paddle set up like the motor in a die grinder
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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