Description
The 8 inch M188A1 separate loading propelling charge provides extended range (zones 8 and 9) in the 8-inch: M110A2 Self-Propelled Howitzer.
The M188A1 is a two increment (zones 8 and 9) white-bag charge, 32 inches long by 8 inches in diameter, The charge weighs 50 pounds and contains 48 pounds of high-energy propellant M31A1. A base igniter pad, containing 1 ounce of black powder, is attached to the base of the charge by a 360 degree seam. An igniter core extends through the center of the charge for almost its entire length. This center core consists of a molded nitrocellulose tube 1.4 inches in diameter, containing a 5 ounce bag of class 1 black powder which is sewn to the igniter pad at the base of the charge.
An additive to reduce gun tube wear lines the increment 9 charge bag. This liner consists of cloth which is impregnated with a composition of titanium dioxide and paraffin wax. The increment 8 charge bag is lined with lead foil for decoppering. A 26-inch long lacing jacket is positioned around the increment 8 charge bag to increase the structural stability of the charge. Four tie straps, sewed to the base of increment 8 charge bag, run the length of two increment charges and are tied with interlapping square knots at the forward end of increment 9. A paper igniter protector cap is placed over the igniter pad tit the base of the charge when it is packed for shipment. This igniter protector cap must be removed before firing.
During storage the cloth bag develops a yellow discoloration. This condition is not classified as a defect and all such charges are considered safe to fire.
Functioning
No information about functioning.
Hazardous Components
No information about hazardous components.
See Also
Nothing else to see.
Source(s)
TM 43-0001-28, Artillery Ammunition (chg 11, 2003)
