Quadrotor configuration I think is the most common configuration for drones. Why has it not been made into a full-size production aircraft? I think that it could be better than helicopters as it does not need a tail.
In: Engineering
If you look at the developments in electrical powered aircraft, they’re all using multiple rotors, but with only one or two conventional engines, given the complexity of the gearboxes and rotor heads etc, the “2 or 4 engines on a wing” or the current helicopter designs fit the airframes better (drones don’t need to have space to carry passengers so their airframe has different design constraints anyway)
And multiple conventional engines lead to their own complexities (harmonics of vibrations etc).
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