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You've given three methods that typically keep a glider in the air. Are there others?

Yes, but not for the faint of heart or thin of wallet. Some other aspects of soaring for which "experimental" is an understatement include:

  • Dynamic soaring. Taking advantage of wind shear (a sudden change in wind speed over a short distance), pilots can "steal" enough energy to stay aloft. Requires optimum conditions and maneuvers of the type guaranteed to test the integrity of the aircraft. A little-known and very rare form of soaring indeed.
  • Ride the Polar Vortex. For the ultimate thrill, readers are advised to contact the Perlan Project and hitch a ride. This group, originally led by Steve Fossett, is attempting to use a global phenomenon known as the Polar Vortex to fly a glider to 100,000(!) feet. This is well above the operational limits of even the famed U2 and SR-71, and, if successful, would qualify the humble glider as the highest continuous-flying aircraft in the world.