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> The link I posted is the only good technical summary

Agreed, except for...

> Its automatic high-speed protection system was triggered 3s later, with a maximum indicated air speed of 358kt (662km/h), or Mach 0.9, recorded.

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There is another thread on exactly what you've perceived as an error, because that statement is, in fact, accurate, counterintuitive to a physics education.

Damnit. My initial thought is that I didn't take into account air pressure. Now I feel like an idiot, time to research...

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