Name: Cartridge, 105 mm: HC, M84
Availability: InStock

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Northern America

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Southern Europe

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Spain

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Australia and New Zealand

Australia

<h2>Armament</h2><p>M101/M101A1, M102 (towed) and M108 (self-propelled) howitzers; Otobreda 105/14 Pack Howitzer (L5); RO Defence L119/M119A1 Towed Howitzer; Howitzer, Light, Towed: 105 mm KH178 ( South Korea ); Giat Industries LG1 Mk I and Mk II Light Gun and M101A1 Modernised (France); Type 75 self-propelled howitzer ( Japan ); NDSB SAKTI 105 mm Light Gun ( Malaysia ); RDM 105 mm M101/33 (Netherlands); 105 mm m/26 (Spain); T64 105 mm Howitzer ( Taiwan ); M101 Modified (Germany); 105 mm Howitzer M56 (Federal Republic of Yugoslavia ).</p><h2>Development</h2><p>The Cartridge, 105 mm: HC, M84 was developed during the Second World War based on a UK 25-pounder base ejection shell. Although apparently no longer in production in the USA, it is still in production elsewhere and remains in widespread service. It is used to emit white screening or marker smoke and can be used to produce coloured smoke (red, yellow or green) for target marking and similar purposes. A variant of this base ejection round, the Cartridge, 105 mm: HC, M84B1 , can be configured for the remote distribution of propaganda leaflets. It does not appear to be used widely for this purpose, being normally used to carry white or coloured HC smoke compound containers.</p><h2>Description</h2><p>The Cartridge, 105 mm: HC, M84 is a semi-fixed round with the projectile being a free fit in the cartridge case, allowing free access to the propellant increments inside the case. The projectile is a hollow steel forging with a boat-tailed base and a cover over a recess in the base, a streamlined ogive and a single gilding metal driving band. The shell contains three cylindrical steel containers, each filled with HC (hexachloroethane-zinc mixture) smoke compound and separated by chipboard ( M84 , M84B1 ) or aluminium (M84A1) spacers; the total weight of HC is 5.57 kg. The forward end of the shell body is connected to the nose fuze cavity by a flash channel with a recess for a black powder burster charge at the base of the channel. The smoke containers are held in position by a baseplate and a PVC locking ring screwed home against it. The joint between the baseplate and the shell body is sealed by a rubber ring. In operation, the nose-mounted M565 time fuze functions at the selected time after firing; the MTSQ M577 may also be utilised. As the fuze functions the resultant flash ignites the black powder burster charge at the end of the flash channel. The internal pressure ruptures the PVC locking ring and forces off the baseplate, also ejecting the three smoke containers from the shell body. Before ejection and at the same time as the burster charge ignites, the flash produced is directed through a perforated channel passing through all three smoke containers to ignite their contents. The containers then continue to produce smoke (usually white) for a period lasting between 40-90 seconds, depending on local conditions. The 105 mm: HC, M84 uses a black powder expulsion charge in a cloth bag and the spacers between the canisters are chipboard. Only MTSQ M501 series fuzes can be used. The M84B1 is the same as the M84 but the expulsion charge is encased in a plastic cup. The M84A1 has a slightly revised body forging, the black powder expulsion charge is in a plastic cylinder, and an updated fuze well thread allows the MTSQ M548 and MT M565 fuzes to be used. The spacers between the smoke canisters are aluminium. The cartridge case is of the M14 type. The standard M14 is manufactured using 70:30 brass but other materials have been used and may still be encountered; for instance the M14B1 used copper-plated drawn steel while the M14B4 is a three-piece spiral-wrapped lacquered steel case. The base-mounted M28 percussion primer is pressed into place.. The cartridge case contains the M67 propelling charge. This consists of seven M1 dualgran propellant increments packed in individually numbered cloth bags threaded together in numerical order on a length of silk or acrylic twine. Before loading, the required increments are arranged inside the case with the No 1 increment, the base charge, at the bottom and the No 7 increment located towards the case mouth. The other increments are arranged around the walls of the case and around the primer tube. Charge 1 is the base charge consisting of 238.42 g of propellant M1 (small size). Charge 2 consists of Charge 1 plus a 41.11 g increment of propellant M1 (small size). Nominal charge weight is 279.53 g. Charge 3 consists of Charge 2 plus a 70.87 g increment of propellant M1 (large size). Nominal charge weight is 350.4 g. Charge 4 consists of Charge 3 plus a 96.39 g increment of propellant M1 (large size). Nominal charge weight is 446.79 g. Charge 5 consists of Charge 4 plus a 153.09 g increment of propellant M1 (large size) and a sheet of lead which functions as a decoppering agent. Nominal charge weight is 599.88 g. Charge 6 consists of Charge 5 plus a 243.81 g increment of propellant M1 (large size). Nominal charge weight is 843.69 g. Charge 7 consists of Charge 6 plus a 369.89 g increment of propellant M1 (large size). Total nominal charge weight is then 1.241 kg. Ballistic data for the 105 mm HC M84 when fired from 105 mm M101/M101A1 howitzers is as follows: Charge 1 - MV 198.1 m/s - max range 3,510 m Charge 2 - MV 216.4 m/s - max range 4,110 m Charge 3 - MV 237.7 m/s - max range 4,860 m Charge 4 - MV 266.7 m/s - max range 5,950 m Charge 5 - MV 310.9 m/s - max range 7,650 m Charge 6 - MV 376.4 m/s - max range 9,380 m Charge 7 - MV 472.4 m/s - max range 11,270 m. Ballistic data for the 105 mm HC M84 when fired from 105 mm M102 howitzers is as follows: Charge 1 - MV 205 m/s - max range 3,700 m Charge 2 - MV 223 m/s - max range 4,300 m Charge 3 - MV 247 m/s - max range 5,200 m Charge 4 - MV 278 m/s - max range 6,300 m Charge 5 - MV 325 m/s - max range 8,100 m Charge 6 - MV 393 m/s - max range 9,600 m Charge 7 - MV 494 m/s - max range 11,500 m. Range data for the 105 mm L119/M119A1 Towed Howitzer when firing the 105 mm HC M84 is as follows: Charge 1 - range 1,800 to 3,400 m Charge 2 - range 2,100 to 4,100 m Charge 3 - range 2,600 to 4,800 m Charge 4 - range 4,100 to 6,300 m Charge 5 - range 4,200 to 7,900 m Charge 6 - range 5,000 to 9,500 m Charge 7 - range 6,200 to 11,500 m.</p><h2>Authorised fuzes</h2><p>MT M565. MTSQ M577 Equivalent rounds AUSTRALIA</p><p>AUSTRALIA</p><h2>Manufacturer</h2><p>Office of Defence Production</p><p>Type : 105 mm HC M84 Description: Standard US specifications. Used with Otobreda 105/14 Pack Howitzer CANADA</p><h2>Manufacturer</h2><p>SRC Industrial Technologies Inc</p><p>Type: Cartridge 105 mm Smoke HC M84</p><p>Description: Standard US specifications</p><p>GERMANY</p><h2>Manufacturer</h2><p>Buck Werke GmbH & Co</p><p>Type: 105 mm Smoke HC DM 15</p><p>Description: Standard US specifications. Projectile only</p><p>ITALY</p><h2>Manufacturer</h2><p>Simmel Difesa SpA</p><p>Type: 105 mm Smoke (BE)</p><p>Description: Standard US specifications. Smoke colours available include white, green, red, yellow and</p><p>violet</p><p>NETHERLANDS</p><h2>Manufacturer</h2><p>Eurometaal NV</p><p>Type: 105 mm Smoke BE</p><p>Description: Stated to be equivalent to 105 mm Smoke HC M84</p><p>SPAIN</p><h2>Manufacturer</h2><p>EXPAL SA</p><p>Type: 105 mm HC M84A1</p><p>Description: Standard US specifications</p><h2>Manufacturer</h2><p>SANTA BARBARA SA</p><p>Type: Municion Fumigena 105 mm M84C</p><p>Description: Standard US specifications</p><p>UNITED STATES OF AMERICA</p><h2>Manufacturer</h2><p>Scranton Army Ammunition Plant</p><p>Type: 105 mm HC M84 Description: Standard specifications</p>

The Cartridge, 105 mm: HC, M84 is a semi-fixed round with the projectile being a free fit in the cartridge case, allowing free access to the propellant increments inside the case. The projectile is a hollow steel forging with a boat-tailed base and a cover over a recess in the base, a streamlined ogive and a single gilding metal driving band. The shell contains three cylindrical steel containers, each filled with HC (hexachloroethane-zinc mixture) smoke compound and separated by chipboard ( M84 , M84B1 ) or aluminium (M84A1) spacers; the total weight of HC is 5.57 kg. The forward end of the shell body is connected to the nose fuze cavity by a flash channel with a recess for a black powder burster charge at the base of the channel. The smoke containers are held in position by a baseplate and a PVC locking ring screwed home against it. The joint between the baseplate and the shell body is sealed by a rubber ring. In operation, the nose-mounted M565 time fuze functions at the selected time after firing; the MTSQ M577 may also be utilised. As the fuze functions the resultant flash ignites the black powder burster charge at the end of the flash channel. The internal pressure ruptures the PVC locking ring and forces off the baseplate, also ejecting the three smoke containers from the shell body.

The cartridge case contains the M67 propelling charge. This consists of seven M1 dualgran propellant increments packed in individually numbered cloth bags threaded together in numerical order on a length of silk or acrylic twine. Before loading, the required increments are arranged inside the case with the No 1 increment, the base charge, at the bottom and the No 7 increment located towards the case mouth. The other increments are arranged around the walls of the case and around the primer tube. Charge 1 is the base charge consisting of 238.42 g of propellant M1 (small size). Charge 2 consists of Charge 1 plus a 41.11 g increment of propellant M1 (small size). Nominal charge weight is 279.53 g. Charge 3 consists of Charge 2 plus a 70.87 g increment of propellant M1 (large size). Nominal charge weight is 350.4 g. Charge 4 consists of Charge 3 plus a 96.39 g increment of propellant M1 (large size). Nominal charge weight is 446.79 g.

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Cartridge, 105 mm: HC, M84

Cartridge, 105 mm: HC, M84

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