3BK12, 3BK12M and their I-238 Fuze

[Eggburt1969]

Has anyone ever come across the Russian 125 mm HEAT-FS-T projectiles whose GRAU index codes are 3BK12 (3БК12) and 3BK12M (3БК12М) - the short-form versions of the designation seen stencilled on the projectiles being BK12 (БК12) and BK12M (БК12М) - along with their I-238 (И-238) fuze?

I've got most details on the projectiles, but not their dimensions, especially their overall lengths, along with the various diameters.

For the I-238 fuze, I've got plenty of technical data about how it works, but I've got no dimensions at all. I would be after its max length and diameter, along with its intrusion and protrusion from the projectile.

 

[rigby]

Here are the dimensions from the И-238 fuze.

 

[Eggburt1969]

Here are the dimensions from the И-238 fuze.

Perfect rigby, thank you.

Just the BK12/BK12M now...

 

[MINENAZ16]

Here are the dimensions from the И-238 fuze.

What is the operation of this fuze ?
Found slids on google but I' very very bad in cyrilic.

 

[rigby]

Here is the complete description

 

[Eggburt1969]

What is the operation of this fuze ?

Yeah. those slides are pretty rubbish to be honest.

I have an early manual covering the ammunition for 125 mm 2A26 and 2A46 series tank guns and its description on the I-238 fuze is pretty extensive. It's overly complex and ultimately still a spit-back fuze, even though it uses an electrical system (set-back generator and storage capacitors) to fire the electrical detonator in the arming shutter. It's no wonder they changed to the V-15 in the 3BK14, and used that type of system in all the later HEAT-FS-T rounds.

 

[weberoed]

sure couple use some of this information in english, thanks

 

[Eggburt1969]

sure couple use some of this information in english, thanks

I've written an entry on the I-238 for the company I work for's munition data (base) system, but you'd have to register to see it.

 

[weberoed]

Eggburt, send me the link please thank you webereod@yahoo.com