Model 1014 XMC The single aircraft in its initial configuration with unducted pusher propeller and fully faired nose wheel[1] Model 1034 XMC The same aircraft was modified in 1972 with a shrouded propeller to explore two design areas: improvement of the propulsive efficiency and noise reduction. The spatted nose gear was replaced by a wheel fairing, as was the main gear. An increased vertical stabilizer area and revised wing tips were also tested.