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Dynamic Soaring takes advantage of differeing wind flows separated by a thin wind shear boundary. Recently the record for radio control glider reached 392 mph (peak speed is over 400mph, but the convention is to measure the uphill return speed:
http://www.youtube.com/watch?v=WaQB16ZaNI4&fmt=18
http://www.youtube.com/watch?v=WaQB16ZaNI4&fmt=18