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
We have issues already with human-rated dual rotor aircraft. A quad copter has 4 potentially fatal points of failure.
This is acceptable in an unmanned aircraft. It is less so with passengers onboard.
That said, there are some proposed sky taxi services that would use automated quad-copters to transfer passengers between office towers or to and from airports.
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