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US Army High Mobility Multipurpose Wheeled Vehicle (HMMWV)

Triton

Donald McKelvy
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In 1981, the United States Army issued RFPs for a new light cargo vehicle it called the HMMWV for High Mobility Multipurpose Wheeled Vehicle. The vehicle is frequently referred to as the "Humvee". This new vehicle had to meet the following requirements:

  • Must be able to carry a 2,500 lb payload under combat conditions.
  • Total payload and vehicle weight of no more than 7,500 lbs.
  • Diesel engine with sufficient muscle to do zero to 30 mph in 6 to 8 seconds using an automatic transmission.
  • Maximum speeds of 60+ mph on the highway, 40 mph off the road.
  • Range of 300 miles
  • Some armored protection for driver and crew that will protect against 16 gram fragments.

Six companies competed for the contract--American LaFrance, FWD, General Dynamics/Chrysler, AM-General, Teledyne, and FMC (Food Machinery Corp.) After testing, the AM General design was accepted, and AM General was given the contract.

Photographs of American La France HMMWV prototype.

Text source: http://www.angelfire.com/nb2/jeeppickups/humvee.html

Image source: http://brochures.slosh.com/hmmwv/
 

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Triton

Donald McKelvy
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Photograph (top) of Chrysler's first prototype for the HMMWV program. Built in 1978, it was known as the Expanded Mobility Vehicle. It could either have a 360 Chrysler V-8 or a 488 Deutz diesel engine, which was common in the earlier prototypes for the Humvee. The vehicle had Dana axles, and weighed 7,800 lbs. It had a range of 400 miles and could ford up to 30 inches of water.

Source: http://www.angelfire.com/nb2/jeeppickups/humvee.html

Photograph (bottom) of Chrysler's revised version of the Expanded Mobility Vehicle, released in 1979. This was to be Chrysler's last entry because the Chrysler Defense Group would soon be bought out by General Dynamics. The vehicle was now only available with the Deutz diesel and weight was reduced to 7,000 lbs. Chrysler claimed it could carry a 2,000 lb payload, as well as go 90 mph.

Text source: http://www.angelfire.com/nb2/jeeppickups/humvee.html

Image source: http://brochures.slosh.com/hmmwv/
 

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Triton

Donald McKelvy
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After General Dynamics bought out the Chrysler Defense Group, they modified the Expanded Mobility vehicle and it was designated the XM998. Eleven were sent to the US Army for testing in mid-1982, featuring both North American Deutz diesel and Chrysler V-8 gasoline engines. None of the vehicles were accepted.

Technical details: Deutz F8L 610 V-8-cycle air-cooled diesel engine, 6537 cc (102 x 100 mm). 119 kW/160 bhp (net) at 3200 rpm. Chrysler A727 Torqueflite automatic transmission. New Process two-speed transfer box with lockable differential. Dana 44 front axle center unit with Tru-Trac. differential. Dana 60 rear axle with No-Spin differential. Hydraulic brakes. Coil spring suspension, independent at front. Coil spring suspension, independent at front. 37-12.5-16 LT tires. 24-Volt electrics. 105-liter fuel tank.

Dimensions and weights: Wheelbase 3414 mm. Track not specified. Overall width and length 4798 x 2159 mm. Height 1752 mm (windscreen). Ground clearance 330 mm (axles). Angles of approach and departure 60 degrees and 46 degrees. Weigh 2245 kg, gross vehicle weight 3400 kg.

Photograph (top) of General Dynamics XM998 weapons carrier.

Photograph (second) of General Dynamics XM998 troop/cargo carrier.

Photograph (third) of General Dynamics XM998 weapons carrier.

Photographs (fourth) and (fifth) of General Dynamics XM998 troop/cargo carrier.

Sources: http://www.angelfire.com/nb2/jeeppickups/humvee.html
and http://brochures.slosh.com/hmmwv/.
 

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Triton

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Triton

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Photograph of Mobility Technology Inc. (MTI) and Lamborghini Cheetah built in 1977. It was powered by a rear-mounted Chrysler 5.9-liter V-8 gasoline engine and had a 3000 mm wheelbase. MTI would later be taken over by Teledyne and the vehicle would be further developed by Teledyne Continental Motors. In 1979, the rear-mounted engine was replaced with a front-mounted engine. Although the vehicle remained experimental it would later serve as the basis for Teledyne Continental Motors General Products Division's HMMWV prototypes.

Sources: http://www.angelfire.com/nb2/jeeppickups/humvee.html
 

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Triton

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The Teledyne HMMWV prototypes were developed and built by the Teledyne Continental Motors General Products Division located in Muskegon, MI.

Technical details: IHC CID V-8-cylinder diesel engine. 6882 cc (101.6 mm x 106.2 mm). 127 kW/170 bhp (SAE) at 3400 rpm. GM 475 Turbo Hydramatic 3FTR automatic transmission. New Process 208 two-speed transfer box with front axle disconnect. Lockable rear differential limited slip front differential. Hydraulic disc brakes. Independent suspension with torsion bars. 36-125-16.5 LT tires. 24-Volt electrics. 91-liter fuel tank.

Dimensions and weights: Wheel base 3302 mm. Track 1773 mm. Overall length and width 4868 mm x 2090 mm. Height 1752 mm (roof). Ground clearance 381 mm. Angles of approach and departure 60 degrees and 38.2 degrees. Weight 2270 kg, GVW 4022 kg.

Sources: http://www.angelfire.com/nb2/jeeppickups/humvee.html
and http://brochures.slosh.com/hmmwv/.
 

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Triton

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The XR311 was a high mobility vehicle that was designed and produced by FMC (Farm Machinery Corporation) Corporation as a private venture in 1969/70. Offered to the US Army for examination as a military vehicle it proved to be a trendsetter. The XR311 featured a space frame, a rear-mounted engine, and extra-large 4-ply tires or nylon construction. FMC decided to sell the project to AM General and not compete in the project because of already over-committed production facilities.

Technical Details: Chrysler V-8 gasoline engine. 5200cc (99.3x84.1 mm) 190 bhp (gross) at 4000 rpm. Chrysler A727 3F1R automatic transmission and chain-drive transfer box with control slip differential and manual lockup. Controlled Slip diffs. in both axles. 4.89:1 ale gear ratio. Hydraulic disc brakes. Independent suspension with torsion bars. 124-16 tyres. 24 volt electrics. 98-liter fuel tank.

Dimensions and Weights: Wheelbase 3070 mm Track 1630 mm Overall length and width 4340x1930 mm. Height 1600 mm (roll cage) Ground Clearance 280 mm (chassis) Angles of approach and departure 75 degrees and 50 degrees weight 2087 kg GVW 2767 kg.
Photographs of FMC (Farm Machinery Company) XR311 vehicle.

Line drawing (top) of FMC XR311.

Line drawing (second) of FMC 311 vehicle dimensions.

Photograph (third) of the anti-tank variant armed with 10 TOW missiles.

Photograph (bottom) of convoy escort /security vehicle variant.

Sources: http://www.angelfire.com/nb2/jeeppickups/humvee.html
and http://brochures.slosh.com/hmmwv/
and http://www.meisterburg.com/xr311/pages/xr311story.htm.
 

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Triton

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AM General Corporation took over the XR311 project and started developing it on their own.

Technical details: V-8-cyl. 5.2 liter gasoline engine (Chrysler) with 3F1R automatic transmission. Single-Speed transfer box. Full-time 4-wheel drive. No-spin diffs. Wheelbase 3070 mm. Original Concept taken over by AM General from FMC and modified to meet the XM966 Combat Support Vehicle Specifications.

Source: http://www.angelfire.com/nb2/jeeppickups/humvee.html
 

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Triton

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XR311 vehicle after several years of development by AM General Corporation. The XR311 would evolve into AM General's proposal for the HMMWV.

Source: http://www.angelfire.com/nb2/jeeppickups/humvee.html
 

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Triton

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Photograph of General Dynamics XM998 HMMWV prototype circa 1982.

Source: Dunne, Jim. "So Long, Jeep; Hello HMMWV" Popular Science June 1982.
 

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Triton

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Photograph of Teledyne HMMWV prototype circa 1982.

Source: Dunne, Jim. "So Long, Jeep; Hello HMMWV" Popular Science June 1982.
 

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Rickshaw

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What has always surprised me about the HMMWV is how comparatively cramped they are inside, particularly compared to the sheer size of the vehicle. A Landrover long wheel base can carry about three times as much gear and/or personnel and is only about 2/3rd the size (it will also fit inside a Chinook ;) ).
 

Triton

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HUMVEE Cobra technology demonstrator data sheet found on eBay.

Source:
http://www.ebay.com/itm/COBRA-HUMVEE-NEW-AND-FAST-DATA-SHEET-/360380591131?pt=LH_DefaultDomain_0&hash=item53e85b6c1b
 

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Winston

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1985 (printed 8/84) brochure for AM General M998 including research & development vehicles.

1. Remote Electric Drive Turret (RED-T) 25mm chain-gun
2. Downlink TOW
3. Eight man armored squad carrier
4. RED-T Setter missile system (https://www.militaryperiscope.com/terms/t0000261.html ?)
5. C1 Shelter
6. Mobile Subscriber Equipment (MSE)
7. Stinger missile team vehicle
8. Remotely piloted vehicle carrier (RPV)

https://www.ebay.com/itm/282844314387
 

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robunos

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Images collected as a PDF . . .


cheers,
Robin.
 

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2samiam

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Bought in Sept. 2018 and have been bringing it back. Been almost a year since it has been insured and entered in its first car show. Still has a list of things that need to be tweaked but it runs and drives. One of Two, that I'm aware of that still exist, Teledyne Continental XM998. Is not original, as there was already substantial parts that were already changed out so stayed with the changes and kept going.

Current Engine is a Chevy 427 Tall Deck Truck motor with 250HP and 405ft/lbs torque.
Transmission is a most likely a TH400 (possibly a TH475 but didn't have anyone take it apart to check) mated to a NP 218 Transfer case (which was only ever available in a HMMWV) so either got changed while it was still experimental or after the fact...not sure.
Rear axle is Aluminum Housing Dana 60 and Front axle is Dana 44 both with Limited Slip.
Independent front and rear suspension with torsion bars.
 

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