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
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