Spitfire makes only 300 mph?

[ICDP]

Originally Posted by 41Sqn_Stormcrow

I fly the Spit 2a frequently and did some tests. With max boost without cut out and max rpm I get about 290- mph (about 6kft) and almost 300 mph with all out. Radiators fully open as to avoid water overheating.

10 mph win for all out? That's quite little I'd say ...

Make sure to go to no cockpit view for a much more accurate reading. The little info bar on the IAS inside the cockpit only reads in increments of 10. So 315 will still read 310 for example.