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  • M3 Stuart (Light Tank, M3) Light Tank (LT)

    The compact M3 Stuart Light Tank proved her worth in the early going of World War 2 but was outclassed by enemy types in short order.

     Updated: 10/9/2016; Authored By Dan Alex; Content ¬©www.MilitaryFactory.com

    The M3 "Stuart" Light Tank became the primary light tank vehicle for the United States Army heading into World War 2 (1939-1944). The vehicle's design was influenced by the preceding M2 Light Tank product and retaining some of its established qualities including use of a 37mm main gun, a four-man crew, and road speed. Pressed into wartime service, it fared well enough during the early-going when used as an infantry support vehicle or fast scout but was wholly outmatched by medium-class tanks in short order. The M5 "Stuart" (detailed elsewhere on this site) became a more evolved M3 with its paired Cadillac engines and new turret. While the M3 form was eventually given up as soon as 1942, the M5 continued the Stuart legacy until it too was replaced by the M244 "Chaffee" light tank.

    The M3 Stuart was made possible by work conducted during the post-World War 1 years. This culminated in development of small, active combat systems for use in infantry support actions using a tracked chassis with machine gun armament. This gave rise to the "M1 Combat Car" which was then followed into service by the cannon-armed M2. Both designs appeared during the 1930s. It was only the rapid expansion of German ground forces in their takeover of Europe during 1939-1940 that serious thought was given to a successor for the M2 as it now proved an obsolete machine. This work then begat the M3 which promised improved protection (at the expense of speed) and greater armor protection. A new suspension arrangement rounded out the list of sought-after qualities.

    After a period of testing and evaluation, the U.S. Army adopted the "Light Tank, M3". When accepted by the desperate British Army under Lend-Lease, they assigned it the name of "Stuart" after the American Civil War Confederate General J.E.B. Stuart. In this way the M3 Medium Tank became the "Lee" (General Robert E. Lee) or "Grant" (General Ulysses S. Grant) and the classic M4 Medium Tank was the "Sherman" (General William Tecumseh Sherman). American Car and Foundry was charged with production of the M3 Light Tank and this began in earnest during March of 1941.

    By this time, Europe had mostly fallen under the might of the Axis forces as Britain attempted to stave off complete elimination across its vast empirical holdings. Lend-Lease allowed American support of its overseas ally by delivering war-making goods without officially having declared war on any one enemy. As such, first combat use of Stuarts occurred with the British in November of 1941 during Operation Crusader. From these actions, the M3 was found to possess a rather weak main gun but its reliability in desert conditions was noted as was maneuverability. The Americans did not press their M3s into combat until the Philippines campaign of 1942.

    The M3 was powered by the Continental W-670-9A, a gasoline-fueled, air-cooled radial aero engine of 7-cylinders and outputting 250 horsepower. This powerpack resided in a rear compartment away from the crew. Suspension came from the Vertical Volute Spring Suspension (VVSS) system which, coupled to the hull design and engine fitting, allowed the vehicle a top speed of 18 miles on road and operational ranges out to 75 miles. Its crew of four was made up of the driver, commander, gunner and bow machine gunner/radio operator. Conditions were decidedly cramped considering internal volume was also taken up by necessary equipment and ammunition stocks. Armament centered around the 37mm M5 (later M6) main gun with coaxial 0.30 caliber M1919A4 Browning machine gun. Four additional 0.30 caliber machine guns were installed including one over the turret, one in the right front of the hull (ball mounting) and the remaining pair in individual side sponsons along the forward superstructure panel. The main gun sat atop a unique mounting in which the gun could traverse some 20-degrees to either side apart from the turret - this gave the gunner some flexibility without needing the entire turret to be turned. The turret was set over midships with the driver seated front-left the hull, the bow gunner to his right and the remaining two crew in/under the turret. The hull crew used hinged vision slots for situational awareness though their forward panel was nearly vertical - shot trap for enemy fire. The track-over-wheel arrangement saw four road wheels used with a front drive sprocket and rear track idler. Overall, the M3 was a classic light tank design of the period, utilizing many established design features seen in competing designs elsewhere.

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    M3 Stuart (Light Tank, M3) Technical Specifications

    Service Year: 1941
    Type: Light Tank (LT)
    National Origin: United States
    Manufacturer(s): American Car & Foundry Company - USA
    Production: 22,744

    Design (Crew Space, Dimensions, Weight, and Systems)

    Operating Crew: 4
    Length: 14.90 feet (4.54 meters)
    Width: 7.35 feet (2.24 meters)
    Height: 7.55 feet (2.30 meters)

    Operating Weight: 14 tons (12,900 kg; 28,440 lb)

    Nuclear / Biological / Chemical Protection: None
    Nightvision Equipment: None

    Installed Power and Standard Road Performance

    Engine(s): 1 x Continental W-670-9A 7 cylinder 4-cycle radial gasoline engine developing 262 horsepower at 2,400rpm.

    Maximum Road Speed: 36 mph (58 km/h)
    Maximum Road Range: 70 miles (113 km)

    Armament and Ammunition

    M3 Stuart:
    1 x 37mm M5/M6 main gun
    1 x .30-06 Browning M1919A4 coaxial machine gun
    1 x .30-06 Browning M1919A4 bow-mounted machine gun.
    1 x .30-06 Browning M1919A4 machine gun on turret roof.
    1 x .30-06 Browning M1919A4 machine gun in left-side sponson.
    1 x .30-06 Browning M1919A4 machine gun in right-side sponson.

    103 x 37mm projectiles
    7,500 x 0.30-06 caliber ammunition

    Global Operators / Customers

    Australia; Belgium; Brazil; Canada; Chile; Colombia; Cuba; Dominican Republic; Ecuador; El Salvador; France; Greece; Haiti; India; Indonesia; Italy; Mexico; Netherlands; New Zealand; Nicaragua; Paraguay; Philippines; Poland; Portugal; Turkey; United Kingdom; United States; Uruguay; Soviet Union; Taiwan; Venezuela; Yugoslavia

    Model Variants

    Light Tank M2 - Initial Light Tank Design on which the M3/M5 series derived from; fitted with a 37mm main gun.

    Light Tank M2A4 - Training Tank

    Light Tank M3 - Based on the M2A4; revised suspension system; increased armor and combat weight; "Stuart" designation brought about by British forces.

    Light Tank M3A1 - Mass Production Model; early models of riveted construction, appearing later with welded turrets and welded hulls; armed with 1 x 37mm main gun and 5 x 7.62mm machine guns.

    Light Tank M3 "Stuart I" - Fitted with Continental 7-cylinder gasoline engine.

    Light Tank M3 "Stuart II" - Fitted with Guiberson T-1020 diesel engine.

    Light Tank M3A1 "Stuart III" - Gasoline engine; power-traverse turret; gyro stabilized main gun.

    Light Tank M3A1 "Stuart IV" - Diesel engine; gyro stabilized main gun; power-traverse turret.

    Light Tank M3A3 "Stuart V" - Increased Armor Protection; revised drivers station; radio necessitating bulged rear compartment.