Nudelman-Suranov NS-37
Encyclopedia
The Nudelman-Suranov NS-37 was a 37 mm (1.5 in) aircraft cannon, which replaced the unreliable Shpitalny Sh-37 gun. Large caliber was planned to allow destruction of both ground targets (including armoured ones) and planes (ability to shoot down a bomber with a single hit).

Developed by A. E. Nudelman and A. Suranov from OKB-16 Construction Bureau from 1941, it was tested at the front in 1943 and subsequently ordered into production, which lasted until 1945. It was used on the LaGG-3 and Yak-9T
Yakovlev Yak-9
The Yakovlev Yak-9 was a single-engine fighter aircraft used by the Soviet Union in World War II and after. Fundamentally a lighter development of the Yak-7 with the same armament, it arrived at the front at the end of 1942. The Yak-9 had a lowered rear fuselage decking and all-around vision canopy...

 fighter planes (mounted between the vee of the engine) and Il-2
Ilyushin Il-2
The Ilyushin Il-2 was a ground-attack aircraft in the Second World War, produced by the Soviet Union in very large numbers...

 ground attack planes (in underwing pods).

Although the heavy round offered large firepower, the relatively slow rate of fire and heavy recoil made hitting targets difficult. While pilots were trained to fire short bursts, on light aircraft only the first shot was truly aimed. Additionally, penetration of medium and heavy tanks' top armour was possible only at high angles (above 40 degrees), which was hard to achieve in battle conditions. For these reasons it was soon replaced by N-37
Nudelman N-37
The N-37 was a powerful, 37 mm aircraft cannon used by the Soviet Union. It was designed by V. Ya. Nemenov of A.E. Nudelman's OKB-16 to replace the wartime Nudelman-Suranov NS-37, entering service in 1946...

autocannon, which used lighter 37x155m round.

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