Unpowered flight
Flight without the use of thrust / From Wikipedia, the free encyclopedia
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Unpowered flight is the ability to stay airborne for a period of time without using any power source. There are several types of unpowered flight. Some have been exploited by nature, others by humankind, and some by both.
Unpowered aircraft are aerial vehicles that can fly without any propulsion mechanism.
The ability to fly short or long distances without power has evolved many times in nature. Many creatures capable of sustained wing-powered flight also soar unpowered for much of the time they are airborne.