back to the Index or the Vehicles page

bare XR311

XR311 with M2HB machinegun

with the fabric roof installed

the front seats

with recoilless rifle

general arrangement of the original (non-Project) vehicle

Crew:  driver + 1 passenger, in bucket seats; or driver + bench seat for two passengers
Weight:  empty, 2177 kg; maximum gross vehicle weight 2857 kg 

Length: 4.343 m
Width: 1.93 m
Height: 1.6 m (to top of the roll cage, does not include ordnance or cargo)
Ground Clearance:  0.335 m

Turning Radius: 6.51 m
Track Width:  1.63 m 

Wheelbase:  3.07 m 

Ground Pressure:  0.49 kg/sq cm 

Max Road Speed: 129 km/hr
Fording Depth:  0.75 m
Gradient: 60%
Vertical Obstacle:  0.2 m
Trench:  0.25 m

Engine:  200 kilowatt electric motor, powered by Fusion Generator Mk 1
Armor:  heavy sheet steel body, armor value 6 (but largely doesn't apply to crew and passengers)
Armament:  either one ring-mounted M2HB machinegun, or a MAG-58 machinegun, or an M174E3 40mm grenade launcher, or a TOW missile launcher, or an M40 recoilless rifle.
Ammunition:   5 belts of .50 cal ammo, or 14 belts of 7.62mm ammo, or 5 drums of 40mm ammo, or six TOW missiles, or 12 rounds of 106mm recoilless rifle ammo.

     This vehicle is a combination dune buggy and heavy jeep. This four-wheel drive vehicle is highly maneuverable; there is a sturdy full-length skid pan under the vehicle. The ring mount is located over the passenger's seat, on the heavy frame of the roll cage; the windshield glass can be removed. Equipment aboard includes hydraulic disc brakes, an electric winch (5000 kg capacity), small tool kit, a fire extinguisher, rear view mirrors, two 20-liter water cans, a removable canvas roof, headlights and tail lights, towing pintle with trailer wiring harness, axe, shovel, appropriate tripod for the fitted weapon, lug wrench, jack, not much else; electrical power is available from the reactor however. The 12.4x16 tires are all-terrain balloon types, with a smaller, high-pressure foam-filled "runflat" tire inside the larger outer tire. That tire size is fairly common for "small agricultural vehicles", but the specific tire on the XR311 is not very common. There is an small "internal" cargo area behind the seats, to carry about 0.3 cubic meters of stuff behind each seat; plus a rear deck, which can carry about 400 kg of cargo. The former 98 liter fuel tank (under the front deck) is replaced by two 45 liter water tanks -- there is a ceramic filter unit between the two tanks. The right-side tank is filled with unfiltered water, which is pumped through the filter into the left-side tank of now-potable water. There is a simple water faucet on the right side dashboard.

Side slopes:  50%
Maximum speed:

level:  130 kph

10% forward slope:  84 kph

60% forward slope:  16 kph

Acceleration time, 0-100 km/hr:  12 seconds

     A typical example of how the vehicle is loaded would be:

• 2087 kg, bare vehicle (no water, no crew, no weapons)
  

• 138 kg, water (including the contents of the two 20-liter jerry cans)
  

• 280 kg, crew and their personal equipment (including survival gear, crew gear, etc.)
  

• 110 kg, vehicle weapon (based on M2HB, tripod, 5 boxes of ammo)

• 242 kg = possible cargo or team equipment. Note that the TOW missile launcher or M40 recoilless rifle will have less cargo space available to the crew
  

     The Army planned to provide jump seats for two passengers on the rear deck; the Project may have some of those around. More likely to be found in the Project:  a zip-up set olive-drab Resistweave® fabric panels, to form a roof, sides with doors and windows, a rear window, and a rear deck cover. The plastic windows have no armor value. While these don't make the XR311 fallout-proof, they certainly can help a bit against noxious environments and fragmentation effects. The complete zip-up package has an area of 9 square meters, and weighs 8 kg.

Note that the vehicle which team R54 obtained from the Waste Lords did NOT have the zip-up armor ...

it was probably salvaged for other purposes.

     It's possible that other versions may exist within the Project:  recoilless rifle carrier, stretcher carrier, etc.

     The original vehicle was designed in 1969/70 by the FMC Corporation; the project was transferred in the mid-Seventies to the AM General Corporation. In 1979, AM General began work on a similar vehicle, the M998 HMMWV; first deliveries of those began in 1983. Biggest differences:  the engine is in front, it has four doors and is able to carry more passengers.