The Lockheed SR-71 Blackbird Leaked Fuel on Purpose, Stretched by Inches at Mach 3 and Somehow Cooled Itself with JP-7 Jet Fuel

Automatically curated summary from 19FortyFive.

According to expert Brandon J. Weichert, writing for 19FortyFive, the Lockheed SR-71 Blackbird was intentionally engineered to leak low-volatility JP-7 fuel while on the ground. Flying at speeds above Mach 3 and altitudes over 80,000 feet, aerodynamic heating expanded its titanium airframe by inches, sealing the integral fuel tank seams in flight. The specialized JP-7 fuel also functioned as a system coolant before reaching the engines. Furthermore, the Pratt & Whitney J58 engines utilized triethylborane (TEB) for ignition, producing a green flash and requiring pilots to carefully ration finite TEB supplies during prolonged reconnaissance missions.

Context and limitations

Based on commentary by Brandon J. Weichert for 19FortyFive; technical descriptions reflect cited publisher commentary rather than direct primary archival or technical documentation.