The AT6 chassis is a series of tracked armoured vehicles produced by Ilaris Heavy Industries. Variants range from standard infantry fighting vehicles to armoured patrol cars to short-range mobile surface-to-air systems.
The D-variant are the infantry fighting vehicle variants, with a 25x137mm CH255 “Talon” chain-driven autocannon, 12.7x99mm independently traversing and elevating heavy machine gun and anti-tank guided missiles.
Fluff
General design outline
The AT6D is a mid-weight infantry fighting vehicle weighing in at around 22 tons, designed to deploy and subsequently support infantry. It seats a driver, commander, gunner and an additional three (AT6D-T) or six (AT6D-P) passengers.
The engine is an eight-litre diesel turbocharged V8, producing 360 horsepower and 980 Nm of torque. Mounted at the front, it transmits power through a twin-transmission setup and front sprockets. Along with that, the sloped front is to house the engine and transmissions, provide marginally increased armour protection, and to house the vehicle’s fuel tank. The fuel tank is mounted on the front to provide additional protection as the fuel is an excellent energy dissapator.
It is equipped with a stabilised main 25mm autocannon firing APDS, HEI or API rounds, a machine gun and anti-tank guided missiles.
Chassis and protection
The AT6D features a monocoque chassis to which steel armour sheets are welded to. Thicknesses range between 60mm on the turret and 50mm on hull front to 15-20mm everywhere else on the hull. Effective armour ranges between 120-80mm depending on aspect and whether it travels through the fuel tank.
To aid in crew protection, the vehicle is pressurised maintaining a positive pressure environment within the cabin, giving it limited resistance to airborne weaponry such as chemical attack. To filter the intake air, the vehicle is equipped with a filtration system, though the vehicle can be set to exclusively recirculation.
The upper coaxial gun features a hidden smoke launcher with cartridges embedded in to the circular ‘turret’.
The suspension are a set of torsion bars with the front roadwheels featuring adjustable dampers internally. While the ride is not great, the stabiliser and cushy interior result in passable interior comfort and ride stability for firing on the move.
Armament
The AT6D features the CH225 “Talon” 25x137mm chaingun. It fires a variety of shells - Armour Piercing Discarding Sabot (APDS), High-Explosive Incendiary (HEI), and Armour Piercing Incendiary (API), most with tracer to zero in rounds, if the laser rangefinder or ballistics computer happen to be damaged or fail. The gun cycles at around 300 RPM, with a semi-automatic, burst and fully automatic fire mode.
The CH225 is belt-fed with clippable belts to allow quick switching of loaded ammunition and follow-up shots. Two ready racks are provided on the gunner’s side, each allowing a belt of 70 25mm rounds to be readied up. Underneath the gunner the semi-ready stowage compartment stores an additional 600 rounds. Behind the gunner is an additional ammunition stowage storing a thousand extra rounds.
The 12.7mm coaxial heavy machine gun is mounted on its own swivel and has elevation. The commander and gunner can use it, though the gunner gets priority if the coax is selected. Short barrel length reduces its accuracy, but increases its ability to turn and elevate, and as a suppression device it is more than enough.
The AT65 Gladius is an anti-tank guided missile. It is semi-active command-line-of-sight, wire-guided and features deploying fins. It is the main anti-tank weapon and is capable of penetrating up to 550 mm of armour, with a surplus of flight profiles optimising chance of a successful kill. With a range of up to 4 kilometres it is more than enough to engage most heavily armoured threats from any distance.
The AT6D-P only features one Gladius ATGM and no additional missiles, while the AT6D-T is intended for heavier and more front-line support duties, thus having a twin ATGM launcher and dedicated storage for additional missiles.
The upper hatches can be used to climb behind the turret and somewhat-safely reload the ATGMs.
Crew provisions and assistance
The driver and commander are provided with a swiveling camera, allowing them to see in a wide cone without having to open the hatches. The driver gets an additional set of pull-down mirrors to allow them to see through the driver port. The gunner gets their own camera, fixed to the turret, which features thermal and night vision, while the driver and commander cameras are only provided with light amplification night vision.
The driver gets additional treats. An automatic torque converter clutch allows the driver to shift gears using the twist control on the control sticks without depressing a clutch. The computer is also capable of shifting itself, but many drivers prefer manual control.
AT6D-T Variant
The AT6D-T is intended for more front-line support, where heavier armour and bigger guns are expectable. Anti-high explosive disposable anti-tank slat armour is welded to the front, and the ATGM launcher is doubled up for additional firepower. Three seats are also removed to make way for an ATGM storage compartment, and the tracks and roadwheels are partially covered by some superficial armour plates protecting from shrapnel and enemy soldiers shoving logs in to the running gear.