Questions about the Yak-9M

[kolya1]

Hello,

Could somebody give me a few precisions about this one ?

From what I could read, it was essentially a Yak-9D wing (with fuel tanks) matched with a Yak-9T's lengthened fuselage, along with a few other refinements, and was produced (from May 1944) in 20mm and 37mm-armed variants, and with M-105PF and M-105PF2 engines...

Could somebody help me about the "other refinements" (I read something about the engine-radiator controls...) ?

And my second question is related to this airplane's performances, The figures I could get gave speed and climb figures which were somewhat lower than those observed on 1942 Yaks (less than 520 km/h at sea level, not even 580 at altitude), and I wondered :

- If they were not higher, why was such an airplane produced so much from mid-1944, when much higher performance soviet planes were already appearing ?

- Was there a significant difference for the planes equipped with the upgraded M-105PF2 engine ?

Many thanks in advance,

Kolya.