Shpitalny Sh-37 [SEP] designer
Shpitalny Sh-37
The Shpitalny Sh-37 () was the first indigenous Soviet aircraft cannon, designed by Boris Shpitalniy at OKB-15. The gun saw limited production and was installed in few aircraft before being replaced by the competing Nudelman-Suranov NS-37 designed at OKB-16. It was installed on a military-trial basis on two short series of aircraft. Installed to fire through the hollow, gear-driven propeller shaft and fastened to the engine block of the Yak-7-37 it was known as MPSh-37, where "MP" stands for "
between Soviet designs bureaus OKB-15 and OKB-16. The former proposed an enlarged version of their unreliable Shpitalny Sh-37; although they made a prototype that passed factory tests in a LaGG-3, their 45 mm gun was not accepted for state trials because of the known issues with the Sh-37 design. OKB-16 presented an enlarged version of their successful NS-37. The recoil force of the NS-45 peaked at seven tons, a force roughly 40% greater than that experienced with the NS-37 (about 5.5 tons). Consequently, the NS-45 was fitted with