Eggburt1969
Well-Known Member
Here are my 85mm rounds. There are two issues:
1. The BK-2M has a KTM-1 fuse. This is not correct. The fuse should be a GPV-2. Might anyone have two such spare fuses?
2. The O-365K with the T-5 fuse and brass protector is not labeled correctly. I believe it to be a O-365 two piece projectile. The HE round on the right is a O-365K one piece round with KTM-1 fuse.
According to the ammo section of the 1948 manual on the ‘85 mm Model 1939 Anti-Aircraft Gun’ I have, there's a few problems here.
The first is that the 53-O-365K isn't listed as using the T-5, nor the TM-30 or VM-30 time fuzes (they aren't 'fuses'). The T-5 and the other time fuzes were for use with the 53-O-365 projectile.
The second is that the 53-O-365 is only listed as being one-piece. It's the 53-O-365K that is listed as having one-piece and two-piece versions. The two-piece version had an internally threaded nose well (M52×3.0) into which a threaded fuze adapter/booster assembly was screwed. The KTM-series fuze was then screwed into this adapter. The one-piece version of the 53-O-365K had a slightly longer nose and a fuze well that was threaded for the KTM-series (M36×2.5).
I should be noted though that the fuze well of the 53-O-365 and the nose well of the 53-O-365K two-piece supposedly share the same M52×3.0 thread. As such a T-5, TM-30 or VM-30 time fuze could be screwed into a the 53-O-365K two-piece if its fuze adapter/booster assembly is first removed.
The info in question from the manual is below.
![85 mm Model 39 AA Gun - 1.png 85 mm Model 39 AA Gun - 1.png](https://www.bocn.co.uk/data/attachments/143/143545-5e9b21c99e11507d75f432dfd41479f7.jpg)
![85 mm Model 39 AA Gun - 2.png 85 mm Model 39 AA Gun - 2.png](https://www.bocn.co.uk/data/attachments/143/143546-eb60d912756685e211ff66930990f036.jpg)
Also, in the 1962 manual I have for the 3BK2/3BK2M (3БК2/3БК2М) HEAT-FS-T projectiles, well 3UBK1/3UBK1M (3УБК1/3УБК1М) rounds, they are listed with the GPV-1 (ГПВ-1) point-initiating based-detonating (PIBD) fuze; more specifically it’s a piezo-electric initiated spit-back design. The rounds are still listed with the GPV-1 fuze in the 1982 manual I have of the D-44 divisional gun?
For note, in the manual I have that dates to 1968, the GPV-2 fuze is listed for the 3BK7/3BK7M (3БК7/3БК7М) HEAT-FS-T projectiles of the 3UBK5/3UBK5M (3УБК5/3УБК5М) rounds. The 3UBK5/3UBK5M rounds (and hence projectiles) were for the 85 mm D-48 and D-70 guns.
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