It'd be great if people would just get their facts straigt. Obviously the 1936 Flettner 185 was an autogyro (even if the motor could engage the rotor for jump-start). The Fairey Rotodyne was a gyroplane, which is just an autogyro with tip jets.
At high airspeed the main rotor of the "X cubed" will presumably be reduced, to avoid RBS, as the props begin to pull. Will it go into autorotation, or close to it?