Quote:
Originally Posted by swiss
Sure, but it takes them forever to build up speed.
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According to the
dive chart posted above it took 36.4 seconds to reach Mach .891 from 274 mph TAS ; that isn’t exactly forever.

The AFDU did note, however, in comparing the Mustang III and Spitfire IX that “The Mustang III pulls away very rapidly in a slight dive.” It only stands to reason that eventually - evidently in about half a minute, the Spitfire IX would gain on the Mustang.