The propeller would induce more drag if it was locked. Keep it
spinning and you will lessen the drag
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Drag if friend and foe of aircraft. it is created by wing flaps
or feathering of propeller blades.
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Increase in motor size with a propeller change, reducing drag on
the plane
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no. it needs some viscous drag to throw the water and drag the
ship forward... feel like a block just gliding in frictionless
plane...
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You could, but then you would be generating additional drag.
This would most likely require more energy to overcome than the
energy generated by the windmilling propeller.