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Harth 1920 glider
 
Circa 1920, Barvarian architect Freric Harth built a wing-pivoting arrangement into his hang glider and was able to fly for over twenty minutes above a flat plain, using only fluctuating orizontal currents to soar 600 feet above his take-off point. Harth could even turn his glider by using his wing levers in opposition.
 
 
 
 
 


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