The SR-71 Blackbird cruised at Mach 3.2 above 25,000 metres, and its titanium skin ran so hot in flight that the fuselage grew about 10 centimetres longer, which is why the fuel tanks were designed to leak on the ground and only seal once the plane heated up in the air
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The SR-71 Blackbird's titanium airframe grew several inches longer at Mach 3.2 as skin temperatures passed 300°C, which is why Lockheed engineers designed the fuel tanks to leak on the ground and seal only in flight.
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