A rotor kite or gyrokite is an unpowered, rotorcraft. Like an autogyro or helicopter, it relies on lift created by one or more sets of helicopter rotor in order to fly. Unlike a helicopter, gyrokites and rotor kites do not have an engine powering their rotors, but while an autogyro has an engine providing forward thrust that keeps the rotor turning, a rotor kite has no engine at all, and relies on either being carried aloft and dropped from another aircraft, or by being towed into the air behind a car or boat or by use of ambient winds for the kiting. As of 2009, no country in the world requires a license to pilot such a craft.
During the 1950s, rotor kites were developed as recreational aircraft, largely due to the efforts of Dr. Igor Bensen in the United States, whose Bensen Aircraft Corporation produced a series of such aircraft, dubbed "gyrogliders" by Bensen. These were marketed as plans or kits for building at home, beginning with the B-5 and culminating with the B-8 by the end of the decade. The Bensen designs became so ubiquitous that the term "gyroglider" is sometimes used to refer to any rotor kite, regardless of manufacturer. In the 1960s, a B-8 gyroglider was evaluated by the United States Air Force as a "Discretionary Descent Vehicle", to provide a more controllable alternative than a parachute for a pilot ejecting from a stricken aircraft.
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