I Want my 4.09 Spit FM's back.........

[lane]

Originally Posted by swiss

Sure, but it takes them forever to build up speed.

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.