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Dynamic soaring is a flying technique used to gain energy by repeatedly crossing the boundary between air masses of significantly different velocity. Such zones of high wind gradient are generally found close to obstacles and close to the surface, so the technique is mainly of use to birds and operators of radio-controlled gliders. As of May 2010, the highest reported speed for radio control dynamic soaring was 445 mph (716 km/h).
Animated explanation: DS Zone  More info at: Wikipedia and Monash University

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