Tanks with glider wings were the subject of several unsuccessful experiments in the twentieth century. It was intended that these could be towed behind; or carried under an airplane, to glide into a battlefield, in support of infantry forces. In the early 1930s, American engineer Walter Christie experimented with flying tanks. Later, the Royal Air Force tested the Baynes Bat, a flying wing intended to carry a light tank—the one-third scale prototype flew well, but no suitable tank was available.