M141 Bunker Defeat Munition
Definition/Scope: (FM 3-23.25) The M141 Bunker Defeat Munition (BDM) is a disposable, lightweight, self-contained, man-portable, shoulder-fired, high-explosive, multipurpose weapon that contains all gunner features and controls necessary to aim, fire, and engage targets. The weapon system consists of an unguided free-flight rocket, which is packed in an expendable, telescoping launcher that also serves as the storage container. It provides water resistant protection for the rocket during weapon storage, transportation, and use. All propulsion unit operation occurs within the launch tube. The M141 BDM is issued as a round of ammunition, requires no maintenance, and can only be fired from the gunner's right shoulder. The weapon system structure consists of inner and outer filament-wound composite tubes, which are stored one within the other to provide for a shorter carry length. The M141 BDM addresses the need to destroy hardened targets, such as bunkers and other fixed enemy positions, and incapacitate the enemy personnel located within these targets. Optimized for the close fight in the contemporary operating environment, the M141 BDM is effective at distances ranging from 15 to 300 meters. It can be employed effectively against double-reinforced concrete walls up to 8 inches thick, triple brick structures, and standard earth and timber bunkers. The M141 BDM can incapacitate threat personnel when employed against cave complexes. It can also perforate up to 20 millimeters of rolled homogenous steel, which provides a capability against lightly armored and thin-skinned vehicles. The M141 BDM utilizes the 83-mm high-explosive, dual-mode assault rocket. The dual-mode rocket consists of three major components: a high-explosive warhead, a dual-mode fuze, and a rocket motor. Warhead function, in quick or delay mode, is automatically determined by the fuze when the rocket impacts a target. The M141 BDM is fired at hard or soft targets without any selection steps required by the gunner. This automatic feature assures that the most effective kill mechanism is employed. The rocket is ignited by electrical power from the launcher firing mechanism. This signal initiates an electric match in the igniter, which in turn ignites the rocket motor propellant. The rocket motor propellant is completely burned out before the rocket leaves the muzzle of the launcher, which protects the gunner from adverse propellant exhaust effects. As the rocket leaves the launcher muzzle, eight spring-loaded fins automatically deploy to aerodynamically stabilize the rocket in flight.
Broader Terms:antitank rocket