Different operating principles, helos are driven by 1 to 2 engines and they increase lift primarily by increasing the angle of attack of the blades, quads primarily increase lift by increasing the thrust of each motor. So we would need a super complicated fly by wire, 4 collective, 4 cyclic system to drive a quad powered by an engine, we can’t drive the blades directly because they wont be able to change thrust fast enough.
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