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
In the first place, a tail is not exactly a big deal so removing it is not exactly a design priority.
4 engines are going to be more expensive than 1, even if the engines are smaller. The fuel efficiency is probably going to be pretty bad, meaning either the craft has to carry a lot of fuel (reducing payload) or have very limited range. Also, the operator has to maintain 4 engines rather than 1, expensive. This makes it a not very good aircraft for many purposes.
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