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Earlier helicopters used tail rotors to counterbalance the torque generated by a single, main rotor but this was inefficient, complex and wasteful. To solve the problems that helicopter pilots had with performing vertical flights,engineers developed quadcopters. These quadcopters were among the first VTOLs (Vertical take-off and landing) aircraft.  Aircraft evolved rapidly during The First World War, with unmanned concepts soon following, culminating with the Kettering Bug, a biplane which flew on a pre-set course using an on-board gyroscope and altimeter. A similar idea, underpinned perhaps the most infamous of Second World War drones, the V-1 Flying Bomb or Doodlebug, which devastated London...

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