1984!
I have no idea from where you got those numbers for Yak-9 1942 model.
Current FM is correct. No need to change that.
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in game and in RL it's was much, and i think, this is why now yak-9 1942 not like real very maneuverable original...
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I've never ever had problems shooting down '42-43 LW fighters in a Yak-9. The Yak easily outturn
anything german, its climb rate and acceleration are also quite good.
Check this:
http://simhq.net/forum/ubbthreads.ph...1284449/1.html
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Yak series.
Again we have a lot of modifications with considerable fluctuation between results.
TsAGI book "Samoletostroenie V SSSR":
Yak1 - 20-21sec turntime, 275m turnradius
Yak1B - 17-19sec turntime, 275m turnradius
Book A.T.Stepanets "Istrebiteli Yak perioda Velikoj otechestvennoj vojny":
Yak1 prototype - 24sec turntime
Yak1'41 M-105P engine - 20-21sec turntime
Yak1'42 M-105PA engine - 19-20sec turntime
Yak1B'43 M-105PF engine - 19sec turntime
Yet theres one thing what helps to find true relative performance - NII VVS made multiple testfights between various Yak modifications and captured Bf109F2 and G2 and these test reports are quoted in book "Istrebiteli Yak perioda Velikoj otechestvennoj vojny" alongside Yaks improvement history.
These test fights revealed that Bf109F2 had advantage in horizontal and vertical turning against all Yak1 models both with M-105PA and more powerfull M-109PF engine.
The only Yak1 what overcome Bf109 (only Bf109G2) in turnrates were 1943 year Yak1 models with improved aerodynamics and M-105PF engine and 1943 year Yak1B with M-105PF engine.
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The turn time of the Yak-9 didnt improve over the earlier models, so 17.5s is nonsense.