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| T6 Combat Car | |
|---|---|
| Name | T6 Combat Car |
| Type | Medium tank (designated combat car) |
| Origin | United States |
| Manufacturer | Sperry Corporation / Marmon-Herrington (proposals) |
| In service | Prototype stage, 1930s |
| Used by | United States Army (testing) |
| Wars | None |
T6 Combat Car
The T6 Combat Car was an American prototype armored fighting vehicle developed during the 1930s as part of a series of experimental United States Army armored projects that sought to reconcile cavalry doctrine with mechanized force concepts pursued by interwar planners in Fort Benning, Edgewood Arsenal, and other institutions. Designed amid debates between proponents in the United States Cavalry and advocates in the Infantry Branch and Tank Corps, the T6 embodied industrial advances explored by manufacturers such as Sperry Corporation and design offices influenced by lessons from the Battle of Cambrai and observations of foreign programs like the Vickers-Armstrongs and Krupp developments.
The T6 originated from a 1934–1936 set of requirement papers issued by the Ordnance Department and reviewed at Aberdeen Proving Ground and Watertown Arsenal. Designers sought a fast, lightly armored vehicle optimized for reconnaissance roles as envisioned by Brigadier General proponents in mechanized cavalry schools at Fort Benning and strategy circles in Washington, D.C.. Work drew on earlier prototypes including the T1 Combat Car, M1 Combat Car, and experimental designs tested by the Tank Corps and contractors such as Boeing's automotive division and General Motors's GMC engineering teams. The T6’s hull and turret layouts reflected influences from contemporary European designs like the Renault FT and Christie-type suspension experiments seen in vehicles evaluated by the Armored Force Board.
The T6 incorporated a welded steel hull and an experimental torsion-bar-like suspension adapted from automotive research by Sperry Corporation engineers who collaborated with Carnegie Institution-trained metallurgists. Control systems and communications were inspired by radio sets fielded by the Signal Corps and procedures codified at Fort Knox training centers. Political and budgetary pressures from the War Department curtailed extensive production, leaving the T6 at prototype and test-article status.
Dimensions and weight were comparable to contemporary interwar medium designs; the T6’s curb weight approximated that of late-1930s American medium proposals studied at Aberdeen Proving Ground. The powerplant options evaluated included an inline gasoline engine developed by Continental Motors Company and a higher-output variant by Packard Motor Car Company, reflecting supply relationships with automotive contractors serving the Ordnance Department. Mobility trials were conducted on test courses established by the Proving Ground Command and in terrain selected by staff from Fort Benning and Fort Meade.
Crew accommodations in the prototype placed emphasis on visibility and command functions, informed by doctrine promulgated at the U.S. Army War College and by officers who had observed mechanized operations in Soviet Union maneuvers and in British armored experiments at Woolwich Arsenal. The prototype’s transmission and steering systems borrowed concepts trialed in earlier designs from Marmon-Herrington and Marmon Motor Company efforts, integrating lessons from trials conducted by the Armored Force School.
Armament options reviewed for the T6 reflected the Ordnance Department’s desire for a compromise between firepower and weight, paralleling debates surrounding the M2 Light Tank and M3 Stuart. Primary weapon candidates included a 37 mm gun produced by Rock Island Arsenal and machine gun mounts using armament from Browning designs supplied via Colt's Manufacturing Company. Secondary armament proposals incorporated coaxial and hull-mounted Browning machine guns to satisfy reconnaissance and infantry-support roles emphasized in doctrinal papers from Fort Benning.
Armor protection emphasized speed and mobility over heavy plate; armor plate specifications were developed with input from metallurgists at the Carnegie Institution and tested against ballistic standards set at Aberdeen Proving Ground. Sloped surfaces and welded joints were adopted after comparative evaluation against riveted hulls seen in European examples such as vehicles from Fiat and Skoda arsenals.
The T6 saw limited service strictly as a testbed within the United States Army evaluation system. Prototypes underwent trials at Aberdeen Proving Ground and were evaluated by officers from the Tank Destroyer Board and training cadres at Fort Knox. Feedback informed subsequent procurement decisions that favored mass-producible designs like the M3 Lee and the later M4 Sherman which benefited from lessons in mobility, reliability, and armament that the T6’s trials contributed to.
Interwar budget constraints, shifting priorities following doctrinal revisions at The Pentagon and political oversight by congressional committees with interests in industrial mobilization curtailed adoption. Engineers and proponents who worked on the T6 later participated in programs at Wright Field and in collaborations between the Ordnance Department and manufacturers such as Ford Motor Company and Chrysler during World War II mobilization.
Because the T6 remained at prototype stage, few formal production variants existed. Design iterations included alternate powertrain packages from Continental Motors and Packard, turret configurations experimenting with different 37 mm mountings, and suspension trials guided by consultants formerly associated with Christie systems. Proposed conversions studied by Ordnance planners considered mounting additional communications equipment supplied by the Signal Corps and proposed mine-protection modifications inspired by countermeasures seen in Spanish Civil War reports and British experimentation at Aldershot.
Some Blueprints and mock-ups circulated among contractors including Sperry, Marmon-Herrington, and General Motors subsidiaries for potential adaptation into armored scout cars and command vehicles similar to prototypes later standardized by the Armored Force.
No complete, operational T6 Combat Car entered mass production; surviving material is limited to photographs, engineering drawings preserved at repositories like the National Archives and documents held by the United States Army Ordnance Museum and specialist collections at Fort Belvoir. The T6’s legacy endures through its technical influence on subsequent American armored designs and doctrine, informing aspects of reconnaissance vehicle development and contributing to the institutional learning that shaped the M3 Lee, M4 Sherman, and postwar armored vehicle programs. Historians working at institutions such as the Army War College, National Armor and Cavalry Museum, and university departments specializing in 20th-century military history reference T6 materials when tracing the evolution of U.S. mechanized forces.
Category:Experimental tanks of the United States