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          The
            Hoppicopter was designed by Horace Pentecost of Seattle,
            Washington during World War II as a replacement for paratroopers'
            parachutes.  Twin co-axial rotors were powered by a 20 hp
            engine.
             A few test hops were made; however, relying on the
            pilots feet for landing gear was inherently dangerous.  If the
            pilot stumbled on landing, the rotating rotors would quickly turn
            into thousands of lethal splinters. 
            An improved
            version was developed with landing gear.  |