105mm Self-propelled Howitzer M1081-4

M108: General
Date of first acceptance October 1962
Manufacturer Cadillac Motor Car Division of General Motors Corp. Crew
5 men:
  • Chief of section in turret
  • Gunner in turret
  • Two cannoneers in turret
  • Driver in hull left front
M108: Dimensions
Combat weight 46,221lbs
20,966kg
Height over AAMG 129.1"
327.9cm
Length without howitzer 240.7"
611.4cm
Howitzer overhang forward 0"
Width without fenders 124.0"
315.0cm
Tread 109.0"
276.9cm
Ground clearance 17.7"
45.0cm
Fire height ~78"
~200cm
Turret ring diameter 100"
250cm
Ground pressure, zero penetration 9.9psi
.69kg/cm²
M108: Armament
Type Mount Ammunition Traverse Elevation
105mm Howitzer M103 M139 in turret 86 rounds 360°
(manual)
+75° to -6°
(manual)
.50cal M2HB MG Flexible in turret AA mount 500 rounds 360°
(manual)
Manual
M108: Armor
Assembly
Welding
Hull
Rolled 5083 aluminum alloy
Location Thickness Angle from vertical
Upper front 1.25"
3.18cm
75°
Lower front 1.25"
3.18cm
19° and 60°
Sides 1.25"
3.18cm
Rear 1.25"
3.18cm
Top 1.25"
3.18cm
90°
Floor 1.25"
3.18cm
90°
Turret
Rolled 5083 aluminum alloy
Location Thickness Angle from vertical
Front 1.25"
3.18cm
22°
Sides 1.25"
3.18cm
22°
Rear 1.25"
3.18cm
Top 1.25"
3.18cm
90°
M108: Automotive
Engine General Motors 8V71T; 8 cylinder, 2 cycle, vee, supercharged diesel
Horsepower Net: 345@2300rpm
Gross: 405@2300rpm
Torque Net: 895 ft-lb@1600rpm
Gross: 980 ft-lb@1700rpm
Fuel capacity 135gal
511L
Transmission Allison XTG-411-2A, 4 ranges forward, 2 reverse
Steering Mechanical, steering wheel (clutch-brake in 1st, 2nd, 1st reverse; geared steer in 3rd, 4th, 2nd reverse)
Brakes Multiple disc
M108: Suspension
Type Road wheels Track return rollers
Torsion bar 7 individually sprung dual/track Flat track
Drive sprockets Idlers Shock absorbers
10-tooth front drive Dual adjustable at rear of track On first and last road wheels/track
M108: Track
T136
Center guide, double pin, steel with detachable rubber pad
Width 15"
38cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 156"
396cm
T137
Center guide, single pin, steel with detachable rubber pad
Width 15"
38cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 156"
396cm
M108: Performance
Max level road speed 35mph
56kph
Max trench 72"
180cm
Max grade 60% Max vertical obstacle 21"
53cm
Min turning diameter Pivot Max fording depth Amphibious with flotation device
Cruising range ~220mi, roads
~350km, roads

The M108 used the same hull and turret as the 155mm self-propelled howitzer M109; these vehicles incorporated components of the M113 APC. The large turret was mounted at the rear of the vehicle, and there was a small step on the right front hull to make room for the engine. The M103 howitzer was fitter with a short bore evacuator near the muzzle. Since the M109's firepower was so much greater, development of the M108 was cancelled in favor of improving its more heavily-armed sibling.

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References

  1. Hunnicutt, R.P. Sheridan: A History of the American Light Tank, volume 2. Navato, CA: Presidio Press, 1995. Reprinted with permission from Sheridan, R.P. Hunnicutt ©1995, available from Presidio Press, 505B San Martin Drive, Suite 160, Navato, CA 94945.
  2. Crismon, Fred W. U.S. Military Tracked Vehicles. Osceola, WI: Motorbooks International, 1992.
  3. Hogg, Ian V. The Greenhill Armoured Fighting Vehicles Data Book. London: Greenhill Books, 2000.
  4. Federation of American Scientists. "M108 105mm Self-Propelled Howitzer." DOD 101. 7 Aug 1999. 18 Apr 2001 <http://www.fas.org/man/dod-101/sys/land/m108.htm>. DOD 101

Last updated 27 Jul 2012.
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© Copyright 2001-12 Chris Conners