This new walker is an expanded and further developed form of the MT-AT. The body is larger, the legs are longer, and everything is given much greater armor protection. As a consequence of the great armor, the speed of this walker is much lower than the MT-AT, despite the longer more efficient legs. Combat speed is only 25 Kph while the maximum 60 can only be attained by diverting almost all weapon and shield power to the drive units. While the slow combat pace may seem a weakness, in its designated arena, it is really a strength. The slow speed will help ensure an even, thorough advance, and make it so a walker can’t be baited into sprinting off ahead of the rest of the force and into an ambush.
Because of the walker’s 8 legs and the rotating command and troop compartments below the drive bay, it has extreme maneuverability, a golden quality in tight city situations. Also, because of the highly developed leg control program, it can continue to walk on legs even if their feet have been blown off and can keep moving on a minimum of 3 legs but at reduced speed. The climbing ability of the MT-AT also comes to play as the AT-UAT can climb up the sides of sufficiently strong buildings. Just like with the smaller AT-LT, this walker has blade edges on the corners of its legs to slice through any lines or cables used to try and trip it.
In case the AT-UAT should fall, or a building crumble as it is being climbed, the walker has a unique recovery system. Built of a central repulsorlift and six short burst, massive impulse solid rockets arrayed around the circumference of the drive pod. The repulsorlift unit is only to level out the walker during its fall, it is no where near powerful enough to lift or hover the walker. Once it has leveled, the rockets wait until the appropriate altitude to fire, slowing the fall to an impact speed that the legs can handle. This safety feature is nearly completely automated, all that’s require is that either pilot hit the large, guarded, initiate button on the cockpit’s center console.
The feet of the walker are overbuilt, heavily armored, and given very powerful joint motivators. This makes the feet resistant to most mines and improvised traps and provides a combat engineering feature. The AT-UAT can, in concert with its construction tractor beams and plasma torches, quickly rip apart obstacles, barricades, fortifications, even topple over whole occupied buildings. The center pad of each foot contains a gription field generator to give some grip on even the worst surfaces, the “toes” of the feet contain an energy sensor and ground penetrating radar to avoid mines, IEDs, and holes. Lastly, the feet assemblies are attached to the lower leg sections by a ball joint and tensor field. That gives each foot incredible dexterity and extremely easy replacement. All these capabilities massed in a single vehicle make it especially useful in clearing a lane for less specialized vehicles following up.
This walker obviously trades speed for heavy defenses, vital in the urban environment where attack often comes unexpectedly from several directions at once. The shield system provides a strong and quickly recharging defense against all weapons and can like all shields be doubled up in a zone taking especially intense fire. In addition, the armor is thick enough to withstand any infantry weapon twice or even three times over. This armor plating is also expanded over what older walkers like the AT-AT had. Where the AT-AT had no armor on the bottom of its body, the AT-UAT has a fully enclosing armor shell around its body, and armor panels over the large joints in the legs.
For its role as a dedicated urban combat vehicle, it takes a sensor system already in use with another urban fighter. The Target Identification Network of the HAVr A9 Floating Fortress has been adapted for use on the AT-UAT. Its sensor receptors are mounted up on the high joints of the legs and the very top of the body, giving them several times the height advantage as on the A9. With this in mind, and additional power and processing units, the effective radius of the TIN has been pushed out to 180 meters. Also borrowed is the Universal Transceiver Package of various sensors from the new AT-AT mk III. This unit was taken whole and brought into the design of the AT-UAT in an attempt at greater standardization.
The largest weapon aboard this walker is the Wide Aperture laser cannon carried below the cockpit. It is a powerful weapon, requiring a full minute to build to full charge, but isn’t intended for use against armor. Instead it is to be used in blasting apart buildings, fortifications, and large troop concentrations it may find in the open. The secondary weapon is the pair of laser cannons on the cheeks of the walker. They aren’t as powerful as the turbolasers of the modernized AT-ATs, but are enough to give an enemy tank crew pause for thought when coming at the AT-UAT. At standard walking height they have a range of about 26 Km, so it could engage targets further out than an AT-AT can.
At the top joint of each leg is a twin turret, just like in the MT-AT. However, in each turret is now a High Charge Concussion Cannon and a heavy blaster cannon. This duplex arrangement provides heavy anti-infantry area target firepower, long range point target capability, light-to-moderate anti-armor capacity, and anti-aircraft fire all from one mount. There are remote control stations for these 8 turrets in the troop section of the walker. When the troopers are deployed, the turrets are all left under droid brain control, but with overall direction coming from the vehicle commander. The MM-s3 grenade launchers are mounted in two retracting turrets that pop out of the top of the walker’s drive pod when in use. Automated arms reload the launchers’ grenade packs from a central cage that can hold up to 12 full packs, plus the two already attached to the launchers it has a total of 1400 grenades. While each pack is loaded with only one type of grenade, every pack could hold a different type and the loading system keeps track of what is in each pack so the gunners have a wide variety in what they launch.
Lastly, two miniaturized version of the capital ship defense system MIST turrets are carried by the AT-UAT, at the front and rear of the drive pod. Together, they keep the walker well protected from missile attacks with exceptional coverage to front, top, and rear. Coverage to the sides can be a bit spotty because of intermittent blind spots as the legs cut across the turrets’ lines of sight. The plasma torches are mounted on stubby secondary arms sprouting from the four “forward” legs, apart from the cutting/mining uses they make good improvised flame throwers.
The interior is littered with hand and foot holds and harnesses so that the crew and troops can move about in the cabin no matter what kind of orientation it is in. Troop deployment is largely the same as in the AT-AT, the walker kneels down to within a couple meters of the ground and then a ramp is lowered. In the AT-UAT, this ramp includes a telescoping section that can shorten or lengthen the ramp by several meters while the ramp itself can open out to 90 degrees. This feature allows the AT-UAT to deploy is troops right into the upper level of a building that the walker is climbing up. The ramp is also on the bottom of the walker, as opposed to the side mounted ramp of the AT-AT.
The heavy-lift winches carried above the troop carrying section are each built integral to the walker’s “spinal” support girder. With the array of launchable grapples and pitons, the winches can haul the AT-UAT to the top of any odd obstacle that it couldn’t normally just climb up, say the surface was too smooth or hard to get a grip on. Two of the winches working in unison are enough to hold or lower the walker, but it takes all three to lift it. Normally these are more often used to lift other pieces of equipment up to a height the AT-UAT has already reached. Lifting an AA battery or sensor/ communications array onto the top of a tower for instance. (For any Spider-Man fans, it can’t swing from building to building.)