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Motors And Anti Tank WeaponsMotors And Anti Tank Weapons

The M6 series projectile consists of the HEAT warhead, fuze, motor with pro-pellant, electric igniter and a nozzle and fin assembly. The basic components are shown below.

The 60 millimeter HEAT warhead is of the classic type with a steel body, ogive shaped stand-off shield, copper liner and Pentolite main charge. The warhead body base is fastened to a male threaded union,

The M401 fuze is a simple, non-delay, inertia actuated type. It consists of a detonator, percussion primer, spring restrained inertia firing pin and two safeties. One is a manual safety pin removed at loading, another is a bore-riding safety pin released by the set-back during firing and held in place by the launcher tube wall until the projectile leaves the muzzle. The fuze assembly is housed in the front portion of the rocket motor. The M401 fuze is extremely sensitive. A blow on the warhead nose equivalent to a 130mm (5 inch) drop on a hard surface will fire the warhead.

The M6 rocket motor is a seamless, heavy wall, steel tubing 31,7mm (1V4 inch) outside diameter and 25.7 mm (1 inch) inside diameter with a wall thickness of 3.0 mm ('/8 inch). The front of the motor is a steel part brazed to the tube. It serves as the base for the detonator-striker assembly. The motor front end is threaded onto the warhead union piece. The motor nozzle is part of the fin assembly.

The initial M-6 series Bazooka rocket motor contained a single cylindrical pro-pellant grain 22 millimeters in diameter with a 6 millimeter hole through the center, This grain configuration gave a slow burning rate, particularly at low temperatures. The grain continued to burn even after exit from the launcher with the gases burning the shooter's face. Subsequently the propellant was modified. The new charge consisted of five individual grains of 9 V2 millimeter diameter with a 1.6 millimeter hole in center. The chemical composition was a modification of a conventional double-base powder and was called "Blastless Bazooka Propellant" (BBP) type M-7,

The M-7 propellant composition is:

Material % by weight

Nitrocellulose 54.6

Nitroglycerine 35.5

Potassium chlorate 7.8

Carbon black 1.2

Ethyl centralite 0.9

While the M-6 series rocket motors were expected to operate at 500 Atmospheres (about 7500 psi), the later rocket motors were operating at 700 Atmospheres (10000 psi) and even 900 Atmospheres (13000 psi), For comparison, modern shotguns are proof fired at 900 Atmospheres and U. S. commercial shotshells operate at 700 Atmospheres.

The electric igniter is held by a plastic nozzle cup inside the nozzle-and-fin assembly, One of the igniter wires is soldered to a fin (ground) while the other (hot) is connected at loading to the launcher electric current generator.

The nozzle-and fin assembly consists of aluminum nozzle, six fins and a circular shroud, all welded together. The assembly, with the igniter seated in, Is screwed onto the rear end of the rocket motor.

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