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  1. #1
    Join Date
    24.05.2003
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    Default 37x136R Heany 1 pdr. high explosive shell, USA

    Cutaway model of a 37x136R high explosive shell with base fuze. It was used it two guns; the “US navy Mk IX 1 heavy 1 pdr gun” designed in 1897, and later in the 37mm Mclean automatic gun, a land based gun with a firing rate of 50 to 100 rpm.
    The 37mm McLean gun was not taken into use by the US army, however 218 guns were sold to Russia in 1916/1917, and later to other countries, but all in small numbers.

    At first glance one would think this is an armour piercing shell, but it is a high explosive projectile with a base fuze. The projectile body is made of cast steel. The full brass made fuze is placed in the threaded hole in the base of the projectile. The fuze has a firing pin that consists of a brass cilinder (inertia weight) with a sharp needle on top. A tensioned pressure spring is placed around the firing pin, between the top of the cilinder and the firing cap. The cilinder of the firing pin is fixated by a radial placed bras pin with a diameter of 1,5mm. Upon firing, inertia moves the cilinder backward, shearing off the brass pin on both sides of the cilinder, moving the brass cilinder backward. This moves the firing pin in the backward position, releasing the tension on the pressure spring. Upon impact, inertia moves the firing pin forward into the firing cap, riding the spring. The firing cap ignites the black powder booster charge above it, which ignites the main charge of black powder in the projectile body.

    This cartridge was produced by the BSC (Betlehem steel company).

    Data:
    Length of complete cartridge : 210mm
    Vo ; 640 mtrs/sec
    Max. range : 3200 mts
    Projectile weight : 476 grams
    Length projectile (with fuze) : 100,5mm

    Regards, DJH
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    Last edited by PzGr40; 11.03.2020 at 23:37.
    You wanna make a piece of ammo look interesting? .......cut it!

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

  2. #2
    Join Date
    24.05.2003
    Location
    Holland
    Posts
    2,865

    Default

    I got some additional info from BOCN Member "Gspragge":

    The projectiles that went with the McClean Gun were the Driggs type with a separate base and the Driggs Patent fuze (the Navy never used it). This Navy pattern has the one piece cast body.
    These were also exported commercially too unmarked and so on. The loading could also be flaked TNT mixed with the Black powder later on. There are numerous Navy fuzes, some with tracers some only tracers etc. This type was replaced (one would think old stock would be used up) with essentially the same projectile as the Army used in the 1916 gun (MK1) around 1915. Also used in the 1Pr Landing gun which was also ship mounted.
    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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