Cartridge Millimeter Smoke Wp M

Type Classification:

C&T OTCM 37119, dtd 1959.


This smoke cartridge is fired in 60mm mortars M2 or M19 and is used for screening and spotting.


The complete round consists of a projectile with a PD fuze, a fin assembly four propel-lant increments, an ignition cartridge, and a percussion primer. The projectile body is of relatively thin-walled steel construction with cylindrical side walls, a conical base, and is filled with a charge of white phosphorous. The projectile base is internally threaded to accept the fin assembly. The projectile nose is fitted with a steel adapter, threaded to accept the fuze and designed to hold the casing of the burster assembly. One of two types of burster assem blies is used, differing only in the construction of the steel burster casing. Both carry the same designation. The burster charge consists of tetryl pellets under pressure, and the burster casing is press-fitted into the adapter in the projectile nose.


When the cartridge is loaded, it slides down the mortar tube until the percussion primer in the ignition cartridge strikes the firing pin in the base cap of the mortar. The flash from the primer ignites the ignition cartridge. The ignition cartridge ignites the propel-lant charge, and gases from the propellant charge expel the projectile from the mortar and propel it to the target. The projectile is fin-stabilized in flight. The PD fuze functions on impact, detonating the burster charge which ruptures the projectile and disperses the white phosphorous filler. The white phosphorous ignites on contact with the air producing a cloud of dense white smoke.

Firing: ""Charge 0 is the ignition cartridge only; Charge

Lower limit 40°F (-40°C) 1 is the ignition cartridge and one increment

Upper limit +125°F charge; Charge 4 is the ignition cartridge and

(+51.7°C) four increment charges.


(+62.8°C] Excessive short rounds may occur when

•Packing One round in this round is fired at temperatures below 0°F.

fiber container; six Store and transport WP rounds at temperacontainers in tures below 111.4°F (melting point of WP). If wooden box impractical, store rounds on bases, so that if •Packing Box: WP melts it will resolidify with void space in nor-

Weight 49.0 lb mal position in the nose of the projectile.

Dimensions 15-3/8 x 13- Erratic performance may occur if voids exist

Cube 1.04 cu ft References:

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