Armored Utility Vehicle M391-2
M39: General
Date of first acceptance October 1944 Total acceptances 640
Crew
11 men:
  • Commander in hull center
  • Driver in hull left front
  • Assistant driver in hull right front
  • 8 passengers
M39: Dimensions
Combat weight 33,450lbs
15,170kg
Height 80"
200cm
Length 208"
528cm
Width over track guards 113"
287cm
Tread 94.63"
240.4cm
Ground clearance 14.3"
36.3cm
Ground pressure, zero penetration
(including track pins)
10.8psi
.758kg/cm²
M39: Armament
Type Mount Ammunition Traverse Elevation
.50cal M2HB MG Flexible on ring mount 900 rounds 360°
(manual)
Manual
M39: Armor
Assembly
Welding
Hull
Rolled homogeneous steel
Location Thickness Angle from vertical
Upper front .5"
1.3cm
64°
Upper middle front .5"
1.3cm
38°
Lower middle front .5"
1.3cm
24°
Lower front .5"
1.3cm
53°
Upper sides .5"
1.3cm
23°
Lower sides .5"
1.3cm
Upper rear .5"
1.3cm
13°
Lower rear .5"
1.3cm
35°
Top .31"
.79cm
90°
Floor .19"
.48cm
90°
M39: Automotive
Engine Continental R-975-C4; 9 cylinder, 4 cycle, radial gasoline
Horsepower Net: 400@2400rpm
Gross: 460@2400rpm
Torque Net: 940 ft-lb@1700rpm
Gross: 1025 ft-lb@1800rpm
Fuel capacity 165gal
625L
Transmission 900T Torqmatic, 3 speeds forward, 1 reverse
Steering Controlled differential, steering levers
Brakes Mechanical, external contracting
M39: Suspension
Type Road wheels Track return rollers
Torsion bar 5 individually sprung dual/track 4 dual/track
Drive sprockets Idlers Shock absorbers
31-tooth front drive Dual adjustable at rear of track On first 2 and last 2 road wheels/track
M39: Track
T69
Center guide, single pin, rubber bushed, steel, parallel grouser
Width 12"
(14.375" including track pins)
30cm
(36.513cm including track pins)
Pitch 5.09"
12.9cm
Shoes/track 83 Ground contact length 116.5"
295.9cm
M39: Performance
Max level road speed 50mph
80kph
Max trench 73.2"
186cm
Max grade 60% Max vertical obstacle 36"
91cm
Min turning diameter 66'
20m
Max fording depth 48"
120cm
Cruising range ~100mi, roads
~160km, roads


The M39 used the hull of the M18 Hellcat tank destroyer with the turret replaced by a open-topped superstructure with a .50cal machine gun ring mount at the front. The M39 served as a personnel and cargo carrier or artillery towing vehicle.

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References

  1. Hunnicutt, R.P. Bradley: A History of American Fighting and Support Vehicles. Navato, CA: Presidio Press, 1999.
    Reprinted with permission from Bradley, R.P. Hunnicutt ©1999, 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.



Last updated 16 Jun 2013.

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© Copyright 2001-13 Chris Conners