In mid-1910, the Wrights changed the design of the Wright Flyer, moving the horizontal elevator from the front to the back and adding wheels although keeping the skids as part of the undercarriage unit. It had become apparent by then that a rear elevator would make an airplane easier to control, especially as higher speeds grew more common. The new version was designated the "Model B", although the original canard design was never referred to as the "Model A" by the Wrights. However, the U.S. Army Signal Corps which bought the airplane did call it "Wright Type A".