Nudelman-Suranov NS-23

The NS-23 was a 23 mm (0.91 in) aircraft cannon designed by A. E. Nudelman, A. Suranov, G. Zhirnykh, V. Nemenov, S. Lunin, and M. Bundin during World War II as a replacement for the Volkov-Yartsev VYa-23 cannon. It entered service in 1944. The NS-23 round was derived from the 14.5×114mm anti-tank round by necking it out to 23 mm.

Nudelman-Suranov NS-23
NS-23 cannons on a Mig-15 at Muzeum Polskiej Techniki Wojskowej, Warsaw
Type	Autocannon
Place of origin	USSR
Service history
Used by	USSR
Wars	Cold War
Production history
Produced	1944–1953
No. built	28,479
Specifications
Mass	37 kilograms (82 lb)
Length	198.5 centimetres (6.51 ft)
Barrel length	145 centimetres (4.76 ft)
Shell	23×115mm
Shell weight	175 g (6.2 oz)
Caliber	23 millimetres (0.91 in)
Barrels	1
Action	short recoil
Rate of fire	550 rpm
Muzzle velocity	690 metres per second (2,300 ft/s)
Feed system	belt

A synchronized version, designated NS-23S (for synchronized), was used for fixed installations firing through the propeller arc.

Applications of the NS-23 included the Antonov An-2, Ilyushin Il-10, Ilyushin Il-22, Lavochkin La-9, La-15, MiG-9, Yak-9UT, Yak-15, Yak-17, Yak-23, and Tu-4. Some early MiG-15s were also equipped with the NS-23.

The NS-23 was replaced in service by the Nudelman-Rikhter NR-23 around 1949.