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GRENADE, RIFLE: HEAT, M31 |
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Filler and Weight | ||
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| NA, 0 | |||
| Body and Overall Weight | |||
| Steel, 1.56 lb | |||
| Color | |||
| Olive drab w/yellow markings | |||
| Type of Round, DODIC | |||
| HEAT, 1330-G970 |
| Description: |
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| The rifle grenade HEAT, M31 is a point-initiated, base-detonated (PIBD), high-explosive, antitank (HEAT) grenade. It employs a shaped charge to defeat armor plate or concrete, and will function against targets at all angles of obliquity up to 65°. The grenade uses a piezoelectric assembly which generates an electric current when crushed on impact with the target. This action initiates the explosive train. Only rifle grenades M31, which are assembled with modified nose assemblies, are authorized for uses. The modified nose assembly has a positive ground between the piezoelectric crystal and the metal nose protector cap. Rifle grenade M31 consists of three basic parts: the cylindrical body with conical ogive and conical rear section; the fuze; and the stabilizer. The ogive contains a piezoelectric assembly in the nose. A lead wire (in conduit) connects this assembly to the fuze, in the base of the body. The body contains Comp B molded against a copper shaped charge liner. A booster is contained in the fuze at the base of the body. Fuze M211 consists of a base, spring-driven detonator rotor and a cover. The detonator rotor contains an electric detonator. The base contains a setback leaf assembly. The cover contains a booster pellet. The aluminum stabilizer consists of a stabilizer tube, with an adapter at its forward end (for connection to the body), and a fin assembly at the other end. When assembled, the fuze is held within the adapter. |
| Use: |
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| To defeat armored targets, against personnel, for screening, signaling or for incendiary effect against flammable targets. |
| Functioning: |
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| An inertia-actuated setback leaf assembly prevents alinement of the detonator with the booster in the fuze until the rifle grenade is launched. Prior to arming, the detonating circuit within the fuze is grounded. Thus, current cannot pass through the detonating circuit, and current from an accidentally crushed or stressed crystal is short circuited to the body of the grenade. The detonating switch is contained within a small rotor which is locked into the short-circuit position by a set-back leaf assembly. When the grenade is launched, the set-back leaf assembly releases the rotor. The rotor turns 90°, opening the shorting switch and closing the firing switch. Upon launching, the grenade functions as follows: Inertia setback causes the first of the three setback leaves in the setback leaf assembly to overcome the tension of its spring. This releases the second leaf. The second leaf rotates, releasing the third leaf. The third leaf rotates, releasing a rotor assembly containing the firing circuit. The rotor assembly turns 90° to close the firing circuit, thus arming the grenade. Upon impact with the target, the crystal is crushed and generates an electrical impulse. The electrical impulse is conducted through a lead wire in the conduit to the electric fuze. The electrical impulse passes through a resistance wire in the detonator, initiating the explosive train. The detonator detonates the booster and, in turn, the shaped charge. The principal explosive force of the shaped charge is directed forward to penetrate the target. |
| Munition Components: |
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| Data Source: |
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| TM 43-0001-29 Grenades |
| Munitions Tech Data Sheet: |
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