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Nudelman—Suranov NS-37
Il2 2 ns37 machine cannon moscow march 1943.jpg
Il-2 with NS-37 cannon in under-wing pods
Type Autocannon
Place of origin  Soviet Union
Service history
In service 1943-1945
Used by Soviet Union
Wars World War II
Production history
Designer A. E. Nudelman and A. Suranov
Designed 1941
Manufacturer Izhmash
Produced 1942-1945
Number built 6833
Weight 170/140 kg (with motor/wing mount)
Length 3.4 m
Barrel length 2,3 m
Width 21,5 cm
Height 41,5 cm

Cartridge 37×198mm
Barrels 1
Action short recoil
Rate of fire 240-260 rpm
Muzzle velocity 900 m/s (HE, HEI-T), 880 m/s (AP-T)
Feed system Belt

The Nudelman-Suranov NS-37 (Russian: Нудельман - Суранов НС-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 fighter planes (mounted between the vee of the engine) and Il-2 ground attack planes (in underwing pods). Although the heavy round offered large firepower, the relatively low 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 in 1946 by the N-37 autocannon, which used a lighter 37x155m round.

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