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LA Speed Check - Lockheed SR-71 Blackbird
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The true story of a SR-71 pilot requesting a ground speed check with Los Angeles Center, while flying the SR-71 Blackbird over Southern California.

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Developed as reconnaissance aircraft in the 1960's, SR-71s are still the world's fastest and highest-flying production aircraft. The aircraft can fly more than 2200 mph (Mach 3+ or more than three times the speed of sound) and at altitudes of over 85,000 feet. As research platforms, the aircraft can cruise at Mach 3 for more than one hour. In flight the titanium skin is heated to 500°C and expands by 15cm. The fuselage has longtitudinal creases to absorb this heat expansion but unsealed tanks leak fuel while on the ground. The Pratt & Whitney J-58 enigines start flight as turbojets, then become ramjets above Mach 1.6, requiring a steep dive due to anaemic low speed peformance. The SR-71's JP-7 fuel is used as a coolant and lubricant during flight, and contains caesium to mask the radar signature of the exhaust plume.
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