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History
Lockheed SR-71 Blackbird
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The Lockheed SR-71 "Blackbird" is a retired long-range, high-altitude, Mach 3+ strategic reconnaissance aircraft developed and manufactured by the American aerospace company Lockheed Corporation. The SR-71 has several nicknames, including "Blackbird" and "Habu".
Lockheed SR-71 Blackbird
Lockheed SR-71 Blackbird
SR-71 Blackbird assembly line at Skunk Works
SR-71 Blackbird assembly line at Skunk Works
A Lockheed M-21 with a D-21 drone on display at Seattle's Museum of Flight
A Lockheed M-21 with a D-21 drone on display at Seattle's Museum of Flight
Detail of SR-71A at the Museum of Aviation, Robins AFB showing red lined no-step areas. Not shown on this museum exhibit is the additional NO STEP wor
Detail of SR-71A at the Museum of Aviation, Robins AFB showing red lined no-step areas. Not shown on this museum exhibit is the additional NO STEP wording on operational aircraft which showed to which side of the line the warning was applicable.
Mach number
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The Mach number, often only Mach, is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. It is named after the Czech physicist and philosopher Ernst Mach.
An F/A-18 Hornet creating a vapor cone at transonic speed just before reaching the speed of sound
An F/A-18 Hornet creating a vapor cone at transonic speed just before reaching the speed of sound