PIBWL presents:

The Vickers 6-Ton Tank (Mark E)


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  © Michał Derela, 2003-2010 Updated: 14. 12. 2009

Part I: development history and construction
Part II: international service
Part III: Polish service


Development history - Designations - Mark F tank - Special vehicles - Construction - Data

One of the most significant tanks in the history of armoured weapons was the British light tank Vickers Mark E (Mk. E), also known as the Vickers 6-Ton. Paradocsically, it is also one of most forgoten tanks - likely because it was used in combat by so-called small countries only, and despite its origin, it is omitted in reviews of British tanks. However not appreciated by the British Army, the Vickers 6-Ton made an impressive international career. Despite a number of produced Vickers Mk. E tanks was not big, but before World War II it was probably the most widespread tank type in the world, after Renault FT-17. Moreover, its licence gave birth to 12,000 tanks of the Soviet T-26 family and to the Polish 7TP tank.


Development history

A prototype of the Vickers-Armstrongs 6-Ton (Mark E) light tank was constructed in 1928 in the British Vickers-Armstrongs Ltd factory, as a private venture. Among its designers, were famous John Carden and Vivian Loyd. The tank was designed in two variants: twin-turret Type A (Alternative A), armed with 2 machine guns only, and single-turret Type B (Alternative B). The novelty in the world was, that Type B tank was armed with a gun and a co-axial machine gun in a turret (called a "duplex mounting" at that time). Earlier tanks were either armed with only one weapon (like Renault family), or different weapons placed in different sides of turret, which could not be manned by one man at a time. The duplex mounting, which now seems obvious, allowed instant change between a gun or machine gun fire, depending on a target. Both weapons had the same sights as well. Thanks to two-men turret, the crewmen were not overloaded with tasks. With its short-barrel 47mm gun, Mark E Type B tank had a good firepower, especially with HE shells. However its armour showed later unsatisfactory, at the moment of design it was even better, than of the British Medium Mk II tank. It was also smaller and faster, than a Medium tank. The patented suspension was a new design, quite simple and offering a relatively smooth ride. It consisted of two independent sets of double bogies on each side, fitted with cantilever springs. Each suspension unit pivoted on its own axle. Manganese steel tracks had a very good durability of 3000 miles.

Vickers Mk.E Type A in an export configuration, with Vickers machine guns (a rubber-rimmed rear pair of wheels is quite unusual for this tank) [3]

The 6-ton tank was evaluated by the British Army but rejected. Apparently this was because the suspension was considered to be a weak element in the design. On the other hand, this decision opened an export possiblity. Due to a wide advertising, in the following years these tanks were bought by (chronologically): USSR, Greece, Poland, Bolivia, Siam, Finland, Portugal, China and Bulgaria. Most of the exported tanks saw combat during their service. Single tanks were also tested in several other coutries. Finally, a couple of tanks were found also in the British Army, because in 1939 the British Government took four tanks Mk.E from the Thai order. According to [2], Vickers works in Elswick manufactured 153 tanks Mark E. The USSR and Poland bought a licence to manufacture Vickers Mk.E. Basing on it, the USSR produced over 12,000 tanks of the T-26 family, while in Poland the 7TP tank was developed. Such a success resulted both from modern tank construction and Vickers efficient sales promotion. However, in the early thirties, the tank was worth it. Despite the new tanks were designed in the world in the mid and late thirties, Vickers Mk. E retained a real combat value until the beginning of the WWII. Its 47mm gun, though obsolete, was still capable of destroying most of early-WWII tanks at a short distance, some at a medium distance. Only the armour of Vickers Mk.E showed completely insufficient due to a development of anti-tank guns.

The features of Vickers Mk.E, especially its suspension, had influence on many later world's tank designs, including Italian medium tanks from M-11/39 to P-40, and Czech tanks Skoda LT vz.35 (PzKpfw-35(t)) and T-21 (Hungarian Turan) (however, an opinion, that their suspension was copied from Vickers, is obviously false). Almost all tanks built after Vickers Mk.E adapted "duplex mounting" of weapons in one turret (it is noteworthy, that modern tanks also have all weapons and all crew members but a driver, in a turret - like Vickers Mk.E).


A confusion in tank designations:

An original factory designation was: Vickers-Armstrongs 6-Ton tank. The tank received also an export designation: Mark E (Mk. E in short; earlier Vickers export tanks were Mark C - one sold to Japan, and Mark D - one sold to Ireland). The manufacturer's shortened designation for this tank was: VAE (Vickers-Armstrongs E), being a part of tanks' serial numbers. The most correct designation of twin-turret and single-turret variants is Mark E Alternative A or B (used in Vickers documents) or Type A / B. Therefore, designations: "Mark A", "Mark B", used in some publications are a result of misunderstanding and are incorrect. Also incorrect is a designation "Mark F" (see below).


A question of Mark F tank

A projected development of Mark E tank was the Mark F, developed in 1934 for Belgium. One of the faults of the Vickers Mk. E (revealed eg. in Poland) was its overheating and quite weak air-cooled engine Armstrong-Siddeley Puma. The original Mark E Type B tank had a turret offset to the left of the combat compartment, because on the right, there was a driver seat. In Mark F tank a new water-cooled engine Rolls-Royce Phantom II (125 HP?) was fitted. Because it would not fit at the back, where the old Armstrong-Siddeley engine went, the engine in the Mark F was fitted on the left side of the fighting compartment, which is why the turret had to be moved to the right. Because of the driver's seat on the right, the turret was placed behind the driver, what demanded lengthening of the combat compartment. Only one prototype of the Mark F was built and tested in Belgium, but rejected.

However the Mark F didn't enter production, but the late production Mark E tanks were fitted with such modified hull, retaining old Armstrong-Siddeley engine at the back. Therefore, they had a lengthened combat compartment and the turret on the right. Such tanks were built for Siam and Finland. Sometimes they are called in publications: "Mark F", but this is not a correct designation of this variant. The factory numbers of these tanks were also VAE (Vickers-Armstrong Mark E), which is evident on their manufacturers plates.


Special vehicles:

Artillery tractor Dragon, Medium Mk.IV. [3]
SPAA gun Vickers-Armstrongs 40mm. [3]

As early as in 1928, there was an universal Vickers Medium Tractor designed on the Vickers 6-ton tank chassis. It was meant for military and civilian market as well. The British Army evaluated the tractor between 1930 and 1932, but finally rejected it. In 1934, Vickers developed an improved artillery tractor, powered by a stronger diesel engine. The British Army ordered 12 new tractors, with a designation: Dragon, Medium Mk.IV. They were given to one of heavy artillery regiments and used for towing 60-pdr guns (127 mm). In 1939, they were included into the British Expeditionary Force and sent to France, where they were seized by the Germans. Small series of artillery tractors were exported: in 1932 one vehicle was bought by the German company Siemens-Schuckert, in 1935 China bought 23 tractors and in 1937 India bought 18 tractors.

On the chassis of the artillery tractor Dragon, also a self-propelled anti-aircraft gun was developed (it was probably the first tracked armoured SPAAG in the world produced in series, although such guns were mounted on a wheeled armoured chassis before). 26 such vehicles were produced for Siam. The vehicle had an open superstructure, with 40mm Vickers automatic AA gun ("pom-pom") mounted, with a rate of fire 120 rds/min.

Artillery tractors, basing on a licensed Vickers 6-Ton chassis, were also developed and producedin the USSR (T-26T) and Poland (C7P). In the USSR, there was built a small series of tank bridgelayers ST-26 and 122 mm SP-howitzers SU-5 on T-26 chassis as well. Also several prototypes of SP-guns, armoured carriers and other special variants were designed.

For Vickers Mk.E tank, enginer N. Straussler designed a special trench-crossing gear. It was a lever device, which allowed tank to cross wide trenches. It was advertised by Vickers, but in practice it appeared very impractical and unsuccessful (photo - [3]).



Technical description

Armament:

Vickers Mark E tanks might have a different armament, according to buyer demands. A typical armament of twin-turret Type A were two water-cooled machine guns Vickers 7.7mm in two turrets. The water radiators of MG's were protected with armoured cylindrical covers. In export variants different machine guns could be fitted. The ammunition was about 6000 rounds.
- see
armament changes of the Polish Vickers Mk.E Type A tanks

A typical armament of the single-turret Type B was a short-barrel tank gun 47mm Vickers QF (Quick Firing), with a coaxial water-cooled 7.7mm Vickers machine gun. A telescopic sight was on the left side of the gun. Gun ammunition was 49-50 anti-tank and high explosive shells and there were about 4000-6000 rounds for MG.
- Finnish tanks were delivered without armament (see in part II).
- Polish tanks had 7.92mm wz.30 MG instead of Vickers MG.


Armour:

The armour was made of riveted rolled plates. Thickness:
- hull: front and sides - 13mm, rear - 8mm
- turret (both single-turret and twin-turret) - 13mm all around
- top and bottom - 5mm.


Construction:

The tank was of a classic construction, with a transmission compartment in front, combat compartment with turret or turrets in the middle, and an engine compartment in the rear. The hull was made of armour plates, riveted to a frame. The crew was three. The driver's seat was in front of the combat compartment, on the right side. Before the driver there was a large two-part hatch, with a vision slot (vision from the driver's seat in combat conditions was not very good). Vickers Mk.E Type A had two identical small one-man "dust-bin" turrets, each with a hatch above. In this variant, the commander-gunner and gunner were sitting on fabric belts. Type B had one big conical two-men turret. In tanks of the main production variant, the turet was offset to the left side. The tanks of the late production batches had hull with the turret offset to the right and to the rear, behind the driver. The commander and gunner both had their stations in the turret, which had a two-part hatch on the roof. Some tanks Type B had a turret with a rear niche for a radio Marconi (model SB4a?). In turrets' sides there were vision slots in the sides.

Engine: Armstrong-Siddeley "Puma", petrol, 4-stroke, 4-cylinder inline horizontal, air-cooled. Capacity: 6667 cm³. As for the power, there are different values in publications: 80 - 87 - 92 HP. Fuel tank capacity: 182 l.

kliknij aby powiększyć
Vickers E Type B cross-section (based upon a drawing by M. Bariatinski).

Transmission: dry multi-disc main clutch, drive shaft. Mechanical gearbox: 4 forward gears, 1 reverse gear. Side clutches with band brakes.
Suspension: drive sprocket in the front, idler in the rear. Vickers paired bogie-type suspension: on either side 2 sets of double bogies with cantilever leaf springs. Each suspension set pivoted on its own axle. Double steel roadwheels, rubber rimmed, apart from the last pair, which was steel only. One track had 102-103 links. Track width: 23 cm, track ground length: 270 cm, distance between tracks' centres: 229 cm (there are different values). Four return rollers on each side.

You can find more drawings at this page.



Specifications:

There are different specifications in publications, especially as for weight and width. The data below are taken primarilly from [1]. The data refer first of all to single-turret Type B:

Crew3
Weight (combat?)7,350 kg [7,200 kg - Type A]
Length /with fenders and muffler 4.56 m / 4.88 m ( 179.5 / 192 in)
Width2.41 m (95 in )
Height2.16 m [2.08 m -Type A] (85 in [82] in)
Ground clearance38 cm (15 in)
Track's width0.23 m (or 0.258m?) (9 in (10?))
Distance between tracks' centres 2.29 m (9.1 in)
Track ground length 2.7 m (106.3 in)
Max. road speed35 km/h (22 mph)
Road / off-road range160 / 90 km
Wading depth90 cm
Max. steepness37°
Crossing ditches180-185 cm
Crossing walls76 cm
Weight to power ratio12.8 HP/ton
Ground pressure0.48 kg/cm²
Fuel consumption (road - off-road) 110 - 200 litres/100 km



Part II: Vickers Mk.E tank international service

Part III: Vickers Mk.E tank in the Polish service


Main sources:
1. Janusz Magnuski: "Angielski lekki czołg Vickers Mark E w polskiej służbie"; Nowa Technika Wojskowa 5/99.
2. Mikhail Baryatinski:
"Niepriznanny 'Vikkers'"; Modelist-Konstruktor 11/92.
3. Christopher F.Foss & Peter McKenzie: "The Vickers tanks"; Keepdate Publishing Ltd 1995 (to buy here).

Our thanks for David Fletcher and the Tank Museum



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Text copyright © Michal Derela, 2003-2010.