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
Because the drone engines and power source don’t scale. You need combustion engines on planes and helicopters – up until the point batteries make a real leap in capacity/mass.
And with that, you lose the cheap and simple solution drones use.
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