Jet Interaction Effect on the Precision Guided Mortar Munition (PGMM)
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ
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The XM395 Precision Guided Mortar Munition PGMM is a fin-stabilized, laser-guided projectile Fig. 1 that was being developed for the US Armys 120mm Mortar System. The combination of its precision capability and high-explosive warhead made it very effective against its required target set, personnel protected by masonry walls, bunkers and lightly armored vehicles. During the PGMM development, numerous projectile firings were conducted. Many of these tests utilized the mid-body thruster mechanism to maneuver the projectile. During these firings a phenomena known as jet interaction JI was encountered when thrusters were fired. The JI caused unexpected angular rates to be imparted to the projectiles, resulting in angular motion which decreased the projectiles effectiveness. This report describes the challenges of understanding, characterizing and counteracting the undesirable JI effects.
- Guided Munitions