Spring-powered aircraft

A Spring-powered aircraft is an aircraft powered by a mechanical device capable of storing energy. The most popular version of a spring-powered aircraft are model toy planes driven by a rubber cord, which is twisted by turning the propeller. When leaving the hand from the propeller, it starts rotating and drives the plane. Most planes of this type have to be thrown by the operator, but some can start directly from the ground.
History
The Besler Brothers (George and William) built the only steam-powered airplane in history to successfully take wing. With an engine produced by the Doble Steam Motors Co. in Detroit, it put out 150 horse power and weighed about 500 pounds. Most interesting, the Bessler's biplane was capable of extremely short landings because the steam engine was easily reversible.
 
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