Experiments with fitting a Shvetsov M-82 radial engine to the LaGG-3 airframe finally solved the power problem and led to the Lavochkin La-5 and La-7.
Ultimately resolving the power problem, experiments involved fitting a Shvetsov M-82 radial engine to the LaGG-3 airframe, which led to the development of the Lavochkin La-5 and La-7 planes.