Quote:
Originally Posted by BK_JG27_Treiber
1: The prototype Yak-9UT had the N-37, all others had the NS-23.
2: The Sh-37 was a predecessor to the N-37.
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Yep ....
Shpitalny Sh-37 cannon was very unreliable and really only a prototype. it was fitted to the LaGG-3 and Il-2's for testing.
As the Sh-37 testing was unsuccessful, Nudelman and Suranov then developed the NS-37 which used the same ammunition but was more reliable. The NS-37 saw operational use late war.
Eventually, as the NS-37 was not really suited to air to air combat it was eventually replaced (1946?) by the less powerful, lighter short recoil version, the N-37 .
Some more details here:
http://russianammo.org/Russian_Ammun...Page_37mm.html