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On this day in 1950 Swede Ralston flew through a dirigible hanger at the Tillamook Naval Air Station in a N.A. AT-6A aircraft (650 HP Pratt-Whitney engine) at an altitude of 50 feet and a speed of 250 miles per hour. While flying through the hangar, Ralston and his aircraft executed a 180 degree roll and emerged upside down.
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