redpoint5 — It's an interesting conjecture.
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You'd have to design the helicopter such that the advancing blade doesn't approach the relatively low speed of sound on Mars, while avoiding a retreating blade stall. This is probably accomplished by long blades.
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This part concerns me. For a given angular speed (RPM) a longer blade would have a higher tip speed.
Perhaps it requires a new architecture. A single blade with a twist in the middle and tip ramjets? https://en.wikipedia.org/wiki/Focke-Wulf_Triebflügel
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