SOV - NS-37 (37 mm kanón)

The NS-37 37 mm calibre cannon


This cannon is a product of the 1942 competition for the 37 mm calibre air cannon. Because the NS-37, designed by A.E. Nudelman and A.S. Suranov, outperformed its competitor, the Spitalny Š-37, in many respects, the gun was accepted into service in October 1942. Within three months, mass production got underway, and from the spring of 1943 the NS-37 gun began to be fitted to production aircraft LaGG-3, Jak-9 T, and also in the Il-2 combat aircraft. This cannon proved very useful in combat. By the end of 1945, over 10,000 units had been produced. The work of the designers of this cannon was recognized as early as 1943, in which they received high state honors.


The design of the NS-37 cannon took into account mainly the reduction of the effects of firing on the aircraft itself. The operation of the gun's automatics was based on the use of a short barrel breech, which succeeded in reducing the overall stress on the gun's breech and the entire aircraft structure. Furthermore, the designers focused on extending the operating time without cleaning and lubrication, as well as on easy and trouble-free supply of the cannon with ammunition.


The serial NS-37 cannon was characterized by very reliable automatic function, relatively low weight and high cadence for the given calibre.


[Example of ammunition used :


37 mm fragmentation-ignited with impact igniter


Weight of cartridge : 1,280 g
Weight of projectile : 735 g
Length of cartridge : ??? mm
Aiming velocity : 900 m/s


Target effects : Provides a penetration in the aircraft covering of up to 1 m2, ignites gasoline in the tanks. When the centroplane is hit, the structure of the attacked aircraft is completely destroyed to the size of fighter jets. Three to four hits are usually sufficient to bring down larger aircraft.


37 mm anti-tank-ignition with tracer


Bullet weight : 1,280 g
Bullet weight : 735 g
Bullet length : ??? mm
Aiming velocity : 900 m/s


Target effects : Pierces 50 mm armor at 200 m at 90°, pierces 30 mm armor at 500 m at 45°, ignites gasoline in tanks. The glowing trail is visible up to a distance of 800 m.



Sources :
- L. Popelínský, Strelecká a rocketová výzbrojatelné letadel, Naše vojsko 1997, ISBN 80-206-0531-2
- V.Dymič, M.Šedivý, Triumf a tragédie, Svět křídel 2001, ISBN 80-85280-70-1
- V.Němeček, Vojenská letadla 1-5, Naše vojsko 1990, full set ISBN 80-206-0114-7
- author's archive
.

Zdroj : www.airpages.ru

NS-37

Grooves 37x195
Groove length. barrel part - 2150 mm, 16 grooves,
Bullet weight (three-shot) - 720 g, explosive weight - 216 g, bullet weight - 1600 g
Burst velocity Vo - 900 m/s,
Initial energy Eo - 280 kJ


Functional principle - short barrel twist (215 mm), charging and cocking with compressed air
min 3.0 MPa (30 atm.
Firing rate - 240 -260 rounds/min


Total length 3400 mm


Weight 160 kg /wing mounted/, 171 kg /engine mounted/


Resources :
Nudelman A.E., Pushki dlja bojevych samoletov, Moscow 1988
Anthony G. Williams, Rapid Fire ..., 2003 edition