Soviet fighters and 4.12

[gaunt1]

I did a little research, conclusion: The FM of the entire La-5 series is based on prototypes.

Performance - prototype; serial production; ingame

Source: Milos Vestsik - Jiri Vrany: Lavockin La-5 (MBI)

La-5:

Speed, (mil/Wep)
At sea level: 515; 509/535; 519/552
At 6500m:600; 580; 600 (at 6000m)

Climb to 5000m, minutes (prototype & serial production)
6; 5.7

Turn time, seconds:
25; 22.6; 19.8

La-5F:

Speed, (mil/Wep)
At sea level: 518/556; 514/551; 519/552
At 6500m:612; 590; 622 (at 6300m)

Climb to 5000m, minutes (prototype & serial production)
5.1; 6.1

Turn time, seconds:
18.5; 21; 20

La-5FN:

Speed, (mil/Wep)
At sea level: 562/595; 542/575-580*; 555/584
At 6500m:648; 620; 639 (at 6000m)

Climb to 5000m,minutes (prototype & serial production)
4.7; 5

Turn time, seconds:
18.5; 19.5; 18.5

* no data for wep in the book