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One of those SR71 planes, complete with the third "piggyback" engine, is at the Boeing Museum of Flight. There is also an SR71 cockpit you are welcome to sit in. Guys, I dunno about you but I never wanted to be a fire fighter or a police officer..... but astronaut or test pilot, you betcha.
The SR71 engine did utilize a strategy of compressing the air coming into the engine by virtue of a cone that extends out the center of the engine. This did creat a 'ramjet' effect, probably not quite the same as this SCRAM technology, but effective enough in the low-to-mid mach numbers.
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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