Spitfire service ceiling...

[Kwiatek]

These test show how far from RL data are CLOD Spitfire MK II up to 20 000 ft, not even mention that above 20 000 ft difference will be even more.

FSX flight model engine is not so good so i think it is not really good base for test.

I'm really impressed with DCS engine and how they manage to model P-51. It is very close to RL data and flight model is also very good ( much better then CLOD and sometimes it seemed to be more difficult then IRL ).