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  1. #1
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    24.05.2003
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    Default 4,7cm Bpg voor 4,7 cm Bohler Pag (Pak)

    Cutaway model of a 4,7cm Bpg (Brisantpantsergranaat / APHE shell) for the 4,7cm Bohler Pag (Pantser afweer geschut / anti tank gun).
    The projectile is pointed and made of steel with a threaded ogive shaped hole in the base to receive the explosive charge and the base fuze No.45. The nose of the projectile is hardened.
    The explosive charge exists of three parts; the main charge of hard pressed TNT in top, a softer pressed charge of TNT below that (together 24 grams of TNT), and –surrounding the detonator- a charge of 6 grams Tetryl.

    The fuze used in this projectile is the Sb. (Slagbuis / impact fuze) No.45.
    Functioning of the fuze: In the lower part of the fuze a brass ring with six axial slots at 60 degr. each – fixating six balls at 60 degr. apart- is placed. This ring locks the balls from outside inward. The firing cap housing has a chamfered edge which fits over the balls, locking them up from inside out. A spring above the firing cap housing wants to press the firing cap into the firing pin, it is however held away by the balls. A bronze interrupted spring ring keeps the brass ring in lower position. After firing the bronze spring ring bends open so the brass ring can move forward on impact, releasing the six balls. The firing cap is now free to move down into the firing pin , however, the enourmous negative acceleration generated during the piercing of the target keeps the firing cap in forward position untill the target is passed and speed is constant. The flame of the firing cap ignites the detonator (white) and the main charge.

    The brass shellcase is filled with strips of powder (lintbuskruit 194 x 7,8 x 1mm).
    There are Dutch (AI) and Austrian (ENZ) manufactured cartridges. The one sectioned here is of Austrian origin. The Dutch cartridge cases have a different firing cap and the projectile uses a different base fuze (Sb No.46).

    Vo. APHE projectile: 660 mtrs/sec
    Penetration: 30 mm at 500 mtrs @90 degr.
    Max. range: 6000 mtrs.
    Length complete cartridge: 329mm
    Length projectile: 156mm
    Length shellcase: 227mm

    The Bohler gun was very modern for it’s time. Wheels and shield could be removed very fast , leaving a very low profile gun only. It was towed by a Trado-4 truck, either horse drawn.
    Per ammo wagon (one per gun) 80 APHE and 20 He cartridges were carried.
    386 of these guns were purchased by the Dutch army in 1938.

    More info and pictures about this gun can be found here (in Dutch):

    http://www.grebbeberg.nl/bibliotheek.../weap0012.html

    Regards, DJH
    Attached Images Attached Images
    Last edited by PzGr40; 25.12.2017 at 11:18. Reason: improving/edit text .
    You wanna make a piece of ammo look interesting? .......cut it!

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  2. #2
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    Default 4,7cm Bohler Pag

    more pictures
    Attached Images Attached Images
    Last edited by PzGr40; 27.05.2008 at 23:44.
    You wanna make a piece of ammo look interesting? .......cut it!

    Looking for / Suche noch:
    -8,8cm Pzgr.40.

  3. #3
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    Default 4,7cm Bohler Pag

    Sb. No.45.
    Attached Files Attached Files
    You wanna make a piece of ammo look interesting? .......cut it!

    Looking for / Suche noch:
    -8,8cm Pzgr.40.

  4. #4
    Join Date
    24.11.2004
    Location
    Holland
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    12

    Default

    Good job DJ, as always.
    Nice pics also.
    greetz

  5. #5
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    24.05.2003
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    Default

    Here an example of a Dutch AI/ Hembrug manufactured 47mm Bohler APHE cartridge. In contrast to the Austrian ENZ manufactured cartridges, the Dutch manufactured cartridges use the “schokbuis No.46” base fuze and use a different powder charge.

    The shellcase is manufactured by the Daalderop company, an old Dutch company that used to manufacture household equipment and household decoratives, but apperently also has manufactured brass shellcases for the Dutch army prior to WW2. These days they only manufacture household boilers.

    The markings on the base of the shellcase can be explained as follows (starting at top):
    2L ; second batch of tape/ribbon powder.
    39: loaded in 1939.
    Circle with spokes and 320: Annealed at 320 degrees celcius.
    39 at 3 o Clock : shellcase manufactured in 1939.
    H at 6 o’clock: brass manufacturer.
    D in rounded triangle: shellcase manufacturor (Daaldrop).

    The schokbuis No.46 is a base impact fuze using inertia caused by desceleration of the impact to swing forward a firing cap into the firing pin, igniting a black powder delay pellet in top of the fuze to delay the explosion of the main charge up to the moment the projectile is inside the target after having pierced the armour of the target. The firing cap is held in backward position by a thin (0,4mm dia.) brass shear wire

    The powder charge in the shellcase consists of strips op powder 145mm long, 8mm wide and 0,8mm thick, locked up in the shellcase by a cartboard cup.

    Regards, DJH
    Attached Images Attached Images
    You wanna make a piece of ammo look interesting? .......cut it!

    Looking for / Suche noch:
    -8,8cm Pzgr.40.

  6. #6
    Join Date
    08.05.2003
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    4,544

    Default

    DJ, well done! Thanks for the update!
    Ich suche Wissen!

    SCIENTIA POTENTIA EST!

    Wer nichts weiß muss alles glauben!

    Und wer toleriert uns?

    Studiert den Hooton-Plan, den Kaufman-Plan und den Morgenthau-Plan!

    Ich bin verantwortlich für das was ich sage, nicht dafür was jemand anders versteht!

    https://www.youtube.com/watch?v=1UkmhtoXCPA
    https://www.youtube.com/watch?v=_aw9aRyjLcI

  7. #7
    Join Date
    12.07.2007
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    Czech Republic
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    Default

    Thanks a lot,
    Bob

    „A mind needs books like sword needs a whetstone, if it is to keep its edge“
    Tyrion Lannister

  8. #8
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    24.05.2003
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    Default

    On request, a picture of the Dutch version of the cartridge.
    Regards, DJH
    Attached Images Attached Images
    You wanna make a piece of ammo look interesting? .......cut it!

    Looking for / Suche noch:
    -8,8cm Pzgr.40.

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