Overview
The ATMOS is fitted with a 155 mm/52 calibre ordnance which conforms to NATO Joint Ballistic Memorandum of Understanding (JBMoU), and is mounted on a 6 × 6 cross-country truck chassis. The breech mechanism is horizontal sliding which automatically opens to the right with a self-sealing metal obturating ring. The buffer is a cylinder hydraulic with a hydropneumatic recuperator. Recoil length is variable from 850 to 1,100 mm with two pneumatic equilibrators. Weapon elevation and traverse are all hydraulic and computer controlled. The gun's aiming gears, load assist systems and spades are operated by a hydraulic power pack. With a 155 mm/52 barrel, a 41 km maximum range can be achieved, using Extended Range Full-Bore - Base Bleed (ERFB-BB) projectile, 30 km firing the NATO L15 High Explosive (HE) projectile and 24.5 km firing the older M107 HE projectile. The ATMOS 2000 carries a total of 27 155 mm projectiles and associated charges and can be operated by a 4 man crew, consisting of two loaders positioned one either side at the rear. The system provides a rate of fire of between 4 and 9 rds/min.
Read more about this topic: ATMOS 2000