SPIT MK I/II and over boost

[ACE-OF-ACES]

Originally Posted by JtD

As an example of WW2 climb tests, look at table I in this Spitfire IX test, you can see a constant IAS up to FTH and a constant TAS above FTH. Il-2 compare will always give you constant TAS, which will give you the somewhat higher climb performance below FTH, about 100 fpm in this case. Less than 5% obviously, and all I wanted to say.

Ah good so both you and that report agree with what I allready said, i.e.

Originally Posted by ACE-OF-ACES

Some if not most planes ROC performance required the BCS to be adjusted as altitude increased

S!