8/8/2019 125mm Heat
1/3
125MM HEAT-FS ROUNDS
Common properties:
Projectile mass 19,000g
Projectile length 680mm
Charge mass 1,624..1,850g
Muzzle velocity 905m/s
Max.dispersion 0.21mil
EFC rating 1
Chamber pressure 300MPa
Extended fins span 343mm
Rear tracer; point-initiating, base-detonating (PIBD) fuse
HEAT-FS rounds:
3VP-5 (3P-11 projectile)(DOI unknown)Practice HEAT round
(samemass and behaviour as HEAT-FS, but inert)
3VBK-7 (3BK-12 projectile)(DOI 1962)420mm RHA at 0; Steel
liner;A-IX-1 charge (flegmatizedRDX); I-238 detonator3BK-12M
modernization utilizesimproved 3V-15 detonator (DOI1968)
3VBK-10 (3BK-14 projectile) (DOI 1968)450mm RHA at 0; Steel
liner; octol charge (flegmatized 75%HMX/25% TNT); 3V-15
detonator
3VBK-16 (3BK-18 projectile) (DOI est.1975)500mm RHA at 0; Copper
liner; octol charge; 3V-15 detonator3BK-18M modernization
introduces wave-shaper boostingpenetration by 10% (DOI
est.1978)550mm RHA at 0; Copper liner; octol charge; 3V-15
detonator
3VBK-17 (3BK-21 projectile) (DOI est.1980)Complex of measures to
improve jet formation reliability550mm RHA at 0; Copper liner;
octol charge; 3V-15 detonator3BK-21B model (DOI est.1982)
3P-11 practice HEAT round
3BK-18M round
8/8/2019 125mm Heat
2/3
520mm RHA at 0; DU liner for improved performance on
advancedarmors and enhanced behind-armor effects.
3VBK-21 (3BK-25 projectile) (est.DOI 1985)Unknown performance
and round configuration
3VBK-25 (3BK-29 projectile) (est.DOI 1988)New explosive
pressingtechnology improves jetprecisionWeight reduced to
18,400g;MV boosted to 915m/sEst.650mm RHA at 0; Unknown liner;
tandem charge3BK-29M presented by NIMI in 1998;unknown improvements
over 3BK-29
3VBK-25I (3BK-29I projectile) (est.DOI1988)Practice HEAT round
that matches 3BK-29'sflatter trajectory
3VBK-27? (3BK-31? projectile) (indevelopment?)800mm RHA at
0680mm RHA at 0 behind external ERA
660mm RHA at 0 behind integral ERAUnknown liner; triple
charge
An experimental HEAT round (according to somesources, designated
3BK-31), was first displayed onVTTV-97 exhibition in Omsk. Its
cutaway shows avery complex and ingenious design, including
shaped-charge precursor, thechannel through the middle charge to
allow passage of the rear jet and so on. Theround is credited with
800mm RHA penetration which was illustrated by a pictureof a 800mm
penetration route. The picture shows that designers
probablydeliberately misaligned the charges so that the middle jet
doesn't need to
penetrate the core of the rear one. If the color of the liner is
the same as that onthe real round, it indicates that it is not
copper, and therefore may have improved
performance against ceramic armors. 3BK-31? is designed to
defeat vehicles with external ERA, integral ERA and/or
composite armor main structure; the precursor charge trips ERA,
the first maincharge conditions advanced armor array and initiates
penetration, and the lastachieves destructive penetration. The
sequence of charges detonation is precursor-> rear charge ->
middle charge.
3BK-29M round
3BK-31? round
