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SR-71 Facts: 29 Details That Might Surprise You

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The Faster the SR-71 Went, the Less Fuel It Used

SR-71 Facts
NASA

The SR-71’s unique inlet/engine/afterburner design is only inlet/engine/afterburner combination in the world that used less fuel as the aircraft gained speed at supersonic levels. The turbojet engine functioned more like a turbo ram engine over 2,000 mph because it bypassed a lot of the air around the engine back into the afterburner. Which is critical. At 2,100mph roughly 80% of the thrust was from the “Ram Thrust”.