What appears, at first glance, to be an airplane without wings, is, in reality, a road vehicle driven by a motorcycle engine and propeller. Airplane parts have been used for nearly all of the construction, and on smooth roads the little machine is capable of good speed. Braking is accomplished through two hardwood reels that are pressed against the two rear wheels. The construction, while light, is strong, and the machine has stood severe tests over rough country roads.

http://thiscircularparade.com/2012/02/17/aeromobile-zips-along-courtesy-of-a-motorcycle-engine/