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
One engine fails and it drops like a stone. Probably all dead. Single blade helicopter can have an engine failure and still land with a skilled pilot using auto-rotation(?). Fixed wing aircraft can glide. For unmanned flight you can get away with whatever you like providing you are okay with the cost of it getting destroyed. You add humans into that mix and your fail-safe measures need to be REALLY high!
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