Cartridge Mm Mortar Training Device Mm Sabot Inert M And Mm Subcaliber Practice Cartridge M M M And M

60mm Mortars

Type Classification:

LCCA, STD, MSR 06806010,

Use:

The cartridge is a training device for all 60mm mortars. The cartridge provides realistic mortar firing training at distances which correspond to range fire distances in the ratio of 1 to 10. The subcaliber device of the cartridge can be fired using standard mortar sighting, fire control equipment and a special firing table (Operators Manual TM 9-1310-249-12&P) in the same manner as standard service mortar ammunition.

Description:

The cartridge consists of a 60mm M3 sabot which is assembled with a 22mm sub-caliber practice cartridge M744, M745, M746 or

M747. The 22mm subcaliber practice cartridges, M744 (Charge 1), M745 (Charge 2), M746 (Charge 3), and M747 (Charge 4) is comprised of a steel-bodied projectile which is assembled to a cartridge case containing a propelling and ejection charge. The projectile is flattened at the tip and contains a percussion piece assembly and smoke charge. A wingshaft assembly containing stabilizer fins (steel wrapped around the shaft) is press fitted into the body of the projectile. The propelling and ejection charges are contained in two separate chambers located in a jet-housing assembly, which is threaded into the base of the cartridge case. A flash tube hole between the chambers permits ignition of the propelling charge by the ejection charge. The cartridges are manufactured in a variety of four propellant charges. Each charge can be identified by notches on the jet screw assembly. One notch designates M744 (Charge 1), two notches designate M745 (Charge 2), etc.

The 60mm M3 sabot (INERT) is designed to fire the 22mm subcaliber practice cartridge. When not loaded with a 22mm practice cartridge, the sabot (INERT) may be used as a dummy round. The sabot is rugged and can be reloaded and fired again (up to 2,000 times) for training purposes. The sabot (aluminum alloy body) has similar bore-riding dimensions and configuration of a 60mm mortar cartridge. It contains an insert 22mm barrel (not rifled) placed longitudinally to receive the 22mm sub-caliber cartridge which is loaded in the barrel just prior to firing. The shaft of the sabot has stabilizer fins (similar to fins of the service mortar cartridge) to guide the sabot as it travels up the mortar tube when fired.

Functioning:

When the practice round (22mm subcal-iber cartridge) is loaded into the sabot, the device is ready for firing. The protective plastic cap covering the percussion cap of the sub-caliber cartridge must be removed prior to firing. The sabot with subcaliber cartridge is dropped into the mortar tube. The percussion cap strikes the firing pin of the mortar and is ignited. The percussion cap ignites an ejection charge in the jet-housing assembly. The gases emerge through the eight axial holes in the jet screw assembly initiating travel of the sabot and subcaliber cartridge up the mortar tube. Simultaneously the ejection charge ignites the subcaliber projectile propelling charge, also contained in the jet housing assembly. This propels the subcaliber projectile out of the cartridge case and through the barrel of the sabot. As the sabot leaves the muzzle of the mortar, the subcaliber projectile clears the barrel of the sabot. The sabot impacts the ground within 1 to 5 meters (depending upon charge fired) of the mortar tube, while the subcaliber projectile continues its flight down range to the target. On impact the projectile functions producing a yellow cloud of smoke and an audible sound.

Tabulated Data:

60mm Sabot M3:

0 0

Post a comment