At extreme speeds (Mach 3+), jet engines like the J58 on the SR-71 Blackbird transition from turbojet to ramjet operation, where most air bypasses the core and compression occurs through pure speed, making the engine more efficient as velocity increases.
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The Engine that becomes a Ramjet | Mach 3.2 Physics #aerospaceAdded:
At Mach 3, this engine stops acting like a normal jet. The SR-71 compresses air using pure speed. At lower speeds, it behaves like a turbojet, but at extreme speed, most air flow bypasses the core completely. Now, the engine behaves almost like a ramjet. The faster it flew, the more efficient it became.
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