Re-usable molded plastic projectile used for training U.S. military forces in the handling of mortars. The projectiles has a casing molded of ABS while molded into the shell is a chrome-plated threaded-steel insert which receives the steel nose holding the explosive charge, which consisted of a .22-cal. blank cartridge. The shell was designed to be ejected from a modified mortar by air pressure. At the target, the heavy steel nose strikes the ground first, and inertia causes the firing pin to move downward and explode the .22-cal. blank. There were six service requirements to meet in the design. The projectile had to be 1) reusable 2) properly balanced to minimize ballistic error, 3) strong enough so that no more than 1 in 1000 firings was damaged, 4) operable at a range of temperatures, 5) capable of storage under temperature extremes, and 6) capable of being fired with specified accuracy at distances ranging from 140 in. to .03 mile. Source: "101st Abn. Unit Tests New Subcaliber Mortar Trainer," Army Times (March 4, 1959); "Practice Shot," Popular Science (August 1959), 110; "ABS Shells Save $14 Per Firing," Modern Plastics (Feb. 1960).
The shell was injection molded with a 2- cavity cam-action three-plate mold on a 16 oz Watson Stillman Machine. The mold built by Lincoln Mold and Die Corp. Mold has removable cores. Injection line pressure is 1400 p.s.i. w/ clamp pressure of 285 tons.
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