Spit IIa is now so much more inferior to the 109

[Kwiatek]

Originally Posted by 41Sqn_Banks

I don't know if you had a look at the merlin em files so far. I've looked at them a year ago, so maybe this has changed, but at that time the Merlin III and XII were very identical. The nominal rpm was 2600 RPM for both. I assume that normal rpm is the value that can be maintained without critical overheat.
My impression is that the Merlin XII - as we have it know - is modeled more like a Merlin III running 100 octane (with +8? instead of +12 emergency boost).

Hmm i didnt look at emd file for CLod yet. But if it is true like you said so there is obviously error in engine data which probably casue problem with Merlin XII power limiation in game.

Luckly i checked today spitfireperformacne site and i found interesting data for Merlin III at 87 octan fuel which i didnt see before:



So for Merlin III at 87 octan fuel we have:

max take off - +6 1/4 at 2850 RPM
climbing - +6 1/4 at 2600 RPM
All-out level flight - +6 1/4 at 3000 RPM

With 100 Octan fuel modification Merlin III power settings was rised to:



So with Merlin III at 100 Octan we have:

take off - +6 1/4 at 3000 RPM
1/2 hr climbing - +6 1/4 at 2850 RPM ( below 20 000 ft) and at 3000 RPM (above 20 000 ft)
all-out level flight - +6 1/4 at 3000 RPM ( 5 minutes)
emergency power - +12 lbs at 3000 RPM ( 5 minutes)


Of course for Merlin XII nomial RPM should be 2850 not 2600 the same like with Merlin III at 100 Octan fuel.