Two Yak-9UT questions that I have

[WTE_Galway]

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.

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