Hang gliders rise because they fly with the same principle as airplanes do. Lift is generated by the air flowing over the wing of the hang glider. There are thermal updrafts also in geological spots that can push the glider up in the air higher. This is caused when heat rises, and if flown right a hang glider can remain aloft for hours.
The delta wing featured on a hang glider was designed by a NASA engineer whose research on kites and parachutes was used to develop the lightweight, maneuverable and durable aircraft. To launch, the pilot runs down a slope at about 15 to 25 mph (24-40 kph) until the movement or air over the wing’s surface is sufficient to generate enough lift to force the glider off the ground and remain airborne. The balance between the gravity pulling the glider back toward the earth and the air over the wing keeps the lift from becoming too great and results in a highly-maneuverable form of flight.
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