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Old 10-23-2018, 08:01 PM   #18 (permalink)
redpoint5
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Quote:
Originally Posted by All Darc View Post
Nasa also found that with many small electric propeller anlong a wings, they need much less energy to take off than with two large propellers.
I'd be curious to read that paper. More propellers are usually inefficient. Heck, even more propeller blades tend to be less efficient. The most efficient helicopters use 2 blades.

This is a big reason why drones aren't efficient. That, and they aren't aerodynamic in forward flight.
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