[airriley]

I tried one years ago, a dual axis on elevator and rudder. I am sure it could have been set up better and worked better than it worked for me, but from my experience if you take whatever you might spend on a gyro and spend it on fuel you will be way ahead. You know from trying to torque roll or hover, or watching other people that you sometimes need severe blasts of surfaces to correct the plane, especially when you are not in the "sweet spot". The gyro just would not do that for me. It would respond on proportion to amount the plane was out of heading, but that proportion was never enough. The gyro was designed to maintain headig of an aircraft at flying speeds, not stall speeds. It would work well for anything else other than vectoring thrust.