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  1. #1
    Senior Member
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    Jun 2007
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    BK-5M 100x695 HEAT-T, Russia, D10 tank gun, T54/55

    Cutaway model of a Russian BK-5M 100x695 HEAT-T cartridge as used in the 100mm D-10 tank gun for the T54/55.
    The projectile is build up of a mild steel body in which a red copper cone is placed. On top of the cone a steel deflector is screwed into the body. The nosepiece is screwed over the deflector. The steel deflector protects the cone from damage when the detonator of the nose fuze detonates, but allows the flame straight downward.
    An electrically activated aluminium nose fuze is screwed in top of the projectile. When activated, the fuze shoots a flame down into the cone, igniting the detonator (red) in the wave shaper below the cone.
    The wave shaper ignites the main charge downward, forcing the explosion to go around the wave shaper before climbing up along the cone. The detonation wave is now shaped in such a way that the force of the detonation will hit the copper cone nearly perpendicular, improving penetration.

    The driving bands are placed on a loose ring, locked up by a nut, Upon firing , the ring will reduce the rotation of the projectile to 1/3 of the normal rotation, thereby reducing loss of penetration due to spalling. The less rotation a shaped charge projectile has, the better.
    As the rotation of the projectile is reduced 2/3, the projectile may become unstable and less precise. To overcome this reduction in balance, a steel tailpiece is screwed to the base of the projectile, housing six knive shaped pop out fins. This tailpiece also houses the tracer element. After leaving the barrel the fins swing out, balancing the projectile in it’s flight.

    The shellcase is made of galvanized steel. A percussion primer with a black powder magazine is placed in the base. The shellcase is filled with a bag containing a small bundle of sticks, further filled with granular powder. A cartboard closing disc keeps the powder charge in it’s lower position.

    I do not know the type designation of the nose fuze (maybe X can help me out here) , but it functions as follows:
    The fuze is build up of an aluminium outer housing (1), in which the aluminium inner housing (2 ) is placed, which houses the safety mechanisms.
    Upon firing, the firing safety, formed by a pin (3) on a spring (4) moves backward, riding the spring. When the pin moves down , it releases a steel ball (5) that falls out of it’s hole, releasing a slider (6) to move outward, pushed by a “peg type” spring (7). The slider moves from short circuit to electrically ‘in line’.
    In the nose of the fuze, a Piezo-electric element (8 ) is placed. Upon impact, this element starts delivering current when placed under pressure. This current ignites an electric squib detonator (9) , which detonates the booster (10) . The flame of this booster spits back in the lower detonator (red) in the wave shaper at the base of the cone, exploding the main charge.
    Before loading the projectile into the barrel, the protective cap (11) is removed, releasing the thin wind cap over the fuze nose (12). However, Russian manuals state that that when firing during heavy rain the cap should not be removed as to prevent premature detonation of the projectile.

    Vo: 900 mtr/sec
    Penetration of the BK-5M HEAT projectile : 375mm steel at 90 degrees.

    On picture 04, the BK-5M is pictured together with the BM-8 APDS-T. A description of this cartridge can be found here:

    Regards, DJH
    Last edited by pzgr40; 30th August 2013 at 01:36 AM.

  2. The Following 12 Users Say Thank You to pzgr40 For This Useful Post:

    apfsds (16th September 2013), APFSDST (3rd September 2013), Bellifortis (31st August 2013), Evo99 (2nd October 2014), MINENAZ16 (17th September 2013), pajarito (30th August 2013), rcaf53 (5th September 2013), SG500 (17th September 2013), Sprockets (1st September 2013), stecol (17th September 2013), VuleM (3rd November 2013), Yodamaster (30th August 2013)

  3. #2
    Senior Member
    Join Date
    Jun 2007
    Thanked 609 Times in 400 Posts
    The fuze is the GPV-2.

  4. The Following 3 Users Say Thank You to EOD For This Useful Post:

    pzgr40 (30th August 2013), rcaf53 (5th September 2013), Yodamaster (30th August 2013)

  5. #3
    Senior Member
    Join Date
    May 2012
    Thanked 272 Times in 149 Posts
    Very nice work DJH, like always. Thank you. Is there anybody here that can explain step by step, how this unusual waveshaper affects the wave emerging from the base of the detonator. The waveshaper is made up of 2 different materials. The brown coloured material seems to have 2 steps cut in its outer surface and the distance from the end of the shaper to the inner base of the shell is large. A very steep cone is used. What would the resulting jet-plug formation look like ?
    Thank you,

  6. #4
    John D. Bartleson Jr.
    Is this a PIBD Lucky fuze? Nice photos. Regard, John

  7. #5
    Senior Member
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    Feb 2009
    Thanked 202 Times in 98 Posts
    Incredible sectioning job, DJH! You have extreme skills.


  8. #6
    Premium Member
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    May 2009
    Kent, England
    Thanked 673 Times in 302 Posts
    Brilliant Job! Fantastic.
    William Mills - Thank you!

  9. #7
    Ordnance Approved
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    Sep 2008
    Thanked 291 Times in 103 Posts
    yugoslav clone was designated UTPE M69, and clone of the shell was designated KO M69.
    ordnance shown in my posts has been dealt with accordingly by EOD personnel

    Federal Civil Protection EOD Department

    my panoramio: http://www.panoramio.com/user/2050161

    my deviantart: http://vranax.deviantart.com/gallery/




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