this post was submitted on 29 Oct 2024
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Per the article the prototype was flow at around 20,000m and they’re specifically going up there for the efficiency reason. The design also has a “high lift-to-drag ratio” that is apparently helping out.
This one has some more detail, no way to confirm its veracity however. https://theasialive.com/chinas-yunxing-jet-completes-test-flight-eyes-supersonic-commercial-travel-by-2027/2024/10/29
It could all be marketing hype, but there are a couple other companies in US and UK working on similar projects.
Yeah, I don't think it's an intractable problem overall. I think it'll be interesting to see if they can make it work.