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Couldn't you use one motor attached to two props spinning in opposite directions?

You absolutely could, and that's exactly how a lot of RC helicopters have been flying around for decades now.

https://www.scribd.com/document/840293339/Lama-V3

I dont know anything about these stuff , but isnot this inefficient when two blades overlapping into each other . that why those TANDEM ROTOR HELICOPTER stuff exists

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