parafoil
Sign in to savethumb|200 px|Illustrations from Jalbert's 1966 patent, showing the keels and the airfoil shape.thumb|200 px|The NASA X-38 prototype makes a gentle lakebed landing at the end of a July 1999 test flight at the Dryden Flight Research Center.
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thumb|200 px|Illustrations from Jalbert's 1966 patent, showing the keels and the airfoil shape.thumb|200 px|The NASA X-38 prototype makes a gentle lakebed landing at the end of a July 1999 test flight at the Dryden Flight Research Center.
A parafoil is a nonrigid (textile) airfoil with an aerodynamic cell structure which is inflated by the wind. Ram-air inflation (created by dynamic air pressure from the parachute's motion through the air) forces the parafoil into a classic wing cross-section. Parafoils are most commonly constructed out of ripstop nylon.