The Lockheed SR-71 Blackbird program traces its origins to 1956, when the CIA approached Lockheed's secret Skunk Works division about developing a successor to the U-2 spy plane. What emerged was the most extraordinary aircraft in history — a machine that still holds the world speed record for an air-breathing aircraft.
The SR-71 flew at Mach 3.2 — more than three times the speed of sound — and cruised at 85,000 feet, where the sky above turns a deep purple and the curvature of the Earth is clearly visible. At those speeds and altitudes, the aircraft was effectively invulnerable. If a missile was fired at it, the standard procedure was simply to accelerate.
The Blackbird's design was revolutionary in every dimension. It was built primarily from titanium — a material so exotic in the 1960s that the CIA had to set up dummy companies to buy it from the Soviet Union. Its J58 engines operated in a hybrid ramjet/turbojet mode that no engine before or since has replicated. Its skin panels were designed with gaps that sealed as the aircraft expanded in the heat of high-speed flight.
Kelly Johnson, the engineering genius who ran Skunk Works and designed the SR-71, said it was the hardest aircraft he ever designed. It was also, by universal consensus, the most beautiful.
The SR-71 flew so high and fast that its only defense was speed. At Cleared4Tees, we build tees for people who appreciate that kind of engineering.
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Blue skies and tailwinds — The Cleared4Tees Crew ✈️
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