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M3A1, 12V (Front view, left side)

 
 

Front view, left side

Picture courtesy of Henrik Clausen, Copenhagen

 

Danish Army Specific: The M3A1 (and IHC M5) half-track were delivered in 2 batches. 1 batch short after WW II and the second batch was delivered as a part of the MDAP in 1955. A total of 32 units were delivered.
Superseded by the
M113-family through the 1960s and 70s. The M21 as late as 1979.
Historical
: Designed jointly by engineers on the Rock Island Arsenal in Illinois and White Motor Company staff in 1937, using a M2A1 wheeled scout car modified with boogie assembly as found on the T9 Ford 1 ton truck. This vehicle was known as the "half-track personnel carrier, T7".
Standardised as the M2 in September 1940 on basis of the T14 produced by the White Motor Company. The M2 had large outward opening hatches for the storage lockers.
Late 1940 the slightly lengthened M3 which had been developed by the Diamond T Motor Car Company was introduced. Among other noticeable changes was the addition of a rear door.
These were replaced by the M2A1 and M3A1 in May 1943 using the M49 ring mount for a 7.62 mm (cal 0.30) or 12.7 mm (cal. 0.50) machine gun in place of the skate rail. In addition pintle mounts were mounted in the rear fighting compartment for further 7.62 mm machine guns.
Representatives from White (Cleveland, Ohio), Diamond (Chicago, Illinois) and the Autocar Company (Ardmore, Pennsylvania), together with the Ordnance Department, formed the Half-track Engineering Committee. Since the demand for half-tracks were greater than any one builder could satisfy, the committee was charged with both designing the vehicles and ensuring that, regardless of manufacturer, all parts except armour plate were interchangeable.
To increase production IHC was contracted for equivalent half-tracks, the M5 and the M9 in 1942. These vehicles used the company's own engine, transmission transfer and axle assemblies.
When production was scaled down in 1944 more than 50.000 half-tracks of all marks had been produced.
Known users besides the US are Belgium, the Netherlands, France, Germany, Great Britain, Israel and Russia.
Length: 6.32 m (246 inches).
Width: 2.20 m (86 inches).
Height: 2.20 m (86 inches).
Weight: 8.900 kg (19.580 lb.).
Armour
: 13 mm (0.5 inches) max.
Engine
: 6-cylinder, White Gasoline type 160AX, 6.326 cm3 (386 cubic inches) displacement, liquid cooled.
Horsepower: 147 at 3.000 rpm.
Transmission: 4-speed, type Spicer 3461.
Transfer case: 2 speed.
Electrical system: 12 volt, negative ground.
Brakes: Hydraulic, vacuum assisted.
Tyres: 8.25 - 20.
Fording depth:
without preparation: 0.81 m (32 inches).
with deep water fording kit: N/A.
Fuel type: Petrol.
Fuel capacity: 260 liter (57 gallons).
Range: 420 km (260 miles)
Crew: 2 + 11.
Armament: 1 cal. .50 machine-gun.
Additional: 5 ton winch (Tulsa, model 18G) capacity - some vehicles had a front roller rather than a winch.
Variants:
IHC M5 (24 kb)
M16 (108 kb)


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