M3 Half-track

Carrier, Personnel Half-track M3

M3 half-track with .30 (7.62 mm) Browning M1919 machinegun
Type Half-track armored personnel carrier
Place of origin  United States
Specifications
Weight 9.3 t
Length 6.18 m
Width 2.22 m
Height 2.26 m, wheelbase 135.5 in (3,440 mm)[1]
Crew 3 + 10 troops

Main
armament
1 x 0.5 in (12.7 mm) M2 machine gun
Secondary
armament
2 x 0.3 in (7.62 mm) M1919A4 machine guns
Engine White 160AX, 386 cu in (6,330 cc),[1] 6 cylinder, petrol, compression ratio 6.3:1,[1]
147 hp (110 kW)
Power/weight 15.8 hp/tonne
Suspension half track, vertical volute springs; front tread 64.5 in (1,640 mm) to 66.5 in (1,690 mm)[1]
Fuel capacity 60 US gal (230 l)[1]
Operational
range
175 mi (282 km)[1]
Speed 45 mph (72 km/h)[1]

The Carrier, Personnel Half-track M3 was an armored vehicle used by the United States, the British Empire and the other Allies during World War II and the Cold War. Nearly 43,000 were produced, and supplied to the U.S. Army and Marines, as well as British Commonwealth and Soviet Red Army forces, serving on all fronts throughout the war.

Contents

History

Between the world wars, the US Army sought to improve the tactical mobility of its forces. With the goal of finding a high-mobility infantry vehicle, the Ordnance Department had evaluated the half-track design by testing French Citroën-Kégresse vehicles. The White Motor Company produced a prototype halftrack using their own chassis and the body of the M3 Scout Car.

The design, using as many commercial components as possible to improve reliability and rate of production, was standardized in 1940 and built by the Autocar Company, Diamond T Motor Company, and the White Company.

Offered with a choice of White 160AX or IHC RED 450 engines, the M3 was driven through a manual constant-mesh (non-synchromesh) transmission with four forward and one reverse gear,[1] as well as a two-speed transfer case.[1] Front suspension was leaf spring, tracks by vertical volute spring.[1] Braking was vacuum-assisted hydraulic,[1] steering manual, without power assist.[1] The electrical system was 12-volt.[1]

The M3 was the larger counterpart to the M2 Half Track Car. The M2 was originally intended to function as an artillery tractor. The M3 had a longer body than the M2 with a single access door in the rear and seating for a 13-man rifle squad. Ten seats were arranged down either side of the vehicle, with three in the cab. Racks under the seats were used for ammunition and rations; additional racks behind the seat backs held the squad's rifles and other stowage. A small rack for mines was added on the outside of the hull just above the tracks. In combat, most units found it necessary to stow additional food, rucksacks and other crew stowage on the outside of the vehicle. Luggage racks were often added in the field, and very late vehicles had rear-mounted racks for this crew stowage.

Early vehicles had a pintle mount just behind the front seats mounting a .50-caliber (12.7 mm) M2 Browning machine gun. The later M3A1 adopted a raised, armored 'pulpit mount' for the .50-caliber, and .30-caliber (7.62 mm) machine guns could be used from mounts along the sides of the passenger compartment. Many M3s were later modified to the M3A1 standard. The body was armored all around, with an adjustable armored shutter for the engine's radiator and a bulletproof windscreen.

The halftracks were initially extremely unpopular and dubbed "Purple Heart Boxes" (a grim reference to the US Army's decoration for combat wounds) by American troops[2]. Chief complaints centered around the complete lack of overhead protection from airbursting artillery shells and that the armor was inadequate against machine gun fire.[2]

Total production of the M3 ran to nearly 41,000 vehicles. To supply the Allied nations International Harvester produced several thousand of a very similar vehicle, the M5 half track for Lend-Lease.

Variants

Armored personnel carriers

Self-propelled guns

Anti-aircraft variants

Post-war Israeli variants

See also

Citations

  1. ^ a b c d e f g h i j k l m n o p Berndt 1993, p. 152.
  2. ^ a b Zaloga 2004, p. 8.
  3. ^ a b c d e f g h i Berndt 1993, p. 147.
  4. ^ "Hit-Run Ack-Ack Guns Mounted on Half-Track" Popular Mechanics, December 1943 and "cover artwork"

References

External links

(Armored Command Field Manual, War Department, September 1943)