So in a vaguely similar vein, can someone explain to a pointy jet bloke how the NOTAR bit works in the event of engine failure? How is yaw managed with effectively no hot air to the rear control system? Must make for interesting auto rotation?
You only need a tail rotor(air for the NOTAR) to counter the torque reaction from the engines driving the main rotors. If the engines fail, there is no torque and therefore no need for a counter-reaction.