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SR-72: US secret hypersonic jet to allegedly break sound barrier in 2025
(interestingengineering.com)
this post was submitted on 04 Jan 2024
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Skylon is a totally different kind of engine, though. It's has a turbojet with active cooling at the inlet, basically. The SR-72 uses a scramjet at high speeds.
It sounds like the enabling tech was 3D printing, based on the Wikipedia article. There must be a really intricate system of tiny channels within it.