Hmmm - are you confusing Vmo (max. operating indicated airspeed) with TAS (true air speed)?
It is my impression that Concorde flew a fairly constant VMO IAS of around 430-440 knots indicated on the cockpit gauge (or knots equivalent once supersonic) in climb once going supersonic at ~28000-30000 feet. But because it was climbing into thinner and thinner air, that constant indicated speed did result in a continuously increasing TAS and Mach (but those are not Vmo).
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* the asterisk on Mach 2.02 is because Concorde also had a leading-edge temperature limit of 127°C, and on some flights the weather was just too warm to reach Mach 2.02 without violating the temperature limit. Concorde has to use M2.0 or M1.96 or some such on those days.
Last edited by pattern_is_full; 24th July 2023 at 05:42.