Refined LaGG-1, with palliative introduced to cure the worst faults of the LaGG-1. The LaGG-3 had outer wings with slats and balanced tail elevators, was lighter, and later also had a more powerful engine. It still was disliked intensely by its pilots. Production problems continued, some factories delivering unairworthy aircraft. Series production aircraft were up to 40km/h slower than those tested by the VVS (table presents the mass production model data).
|Type||LaGG-3 series 1-3||LaGG-3 series 66|
|Engines||1*1050hp Klimov M-105P||1*1180hp Klimov M-105PF|
|Speed at 0m||498km/h||542km/h|
|Speed||575km/h (at 5000m)||591km/h (at 3560m)|
|Climb to 5000m||6.8min||5.6min|
|Guns||3*mg12.7mm UB(S) 220rpg
2*mg7.62mm ShKAS 325rpg