Light Tank Mk VIII

Last updated

Tank, Light, Mk VIII, Harry Hopkins (A25)
IWM-MH-9324-Harry-Hopkins.jpg
Mk VIII Light Tank 'Harry Hopkins'
Type Light tank
Place of originUnited Kingdom
Production history
Designer Vickers-Armstrong
Manufacturer Metro-Cammell
Produced1943–1945
No. built100 [1]
Variants Alecto (SPG)
Specifications
Mass19,040 pounds (8.64 t)
Length4.34 m (14 ft 3 in)
Width2.69 m (8 ft 10 in)
Height2.11 m (6 ft 11 in)
Crew3 (commander, driver, gunner)

Armour 17–38 mm (0.67–1.50 in)
Main
armament
Ordnance QF 2 pounder
50 rounds
Secondary
armament
7.92 mm Besa machine gun
2,025 rounds
Engine149-hp Meadows 12 cyl. petrol engine
148 hp (110 kW)
Power/weight17.4 hp/tonne
SuspensionSteerable road wheels
Operational
range
125 miles (201 km)
Maximum speed 30 miles per hour (48 km/h)

The Tank, Light, Mk VIII (A25), also known as the Harry Hopkins, after American President Roosevelt's chief diplomatic advisor, and A25 from its General staff specification number, was a British light tank produced by Vickers-Armstrong during the Second World War. The Mk VIII was the last in the line of light tanks the company had built for the British Army, and was intended to be the successor of the previous light tank designed by Vickers-Armstrong, the Mk VII Tetrarch. A number of changes were made to the Mk VIII, most notably increasing its width, length and weight and also increasing the thickness of the armour. The design of the tank was submitted to the War Office in late 1941, with an initial order for 1,000 models being made by the Tank Board of the War Office in the same month, a number that increased to 2,410 in November. Production began in June 1942 but immediately began encountering problems with the tank, and a number of modifications had to be made to the design after complaints were made by the War Office and the Fighting Vehicle Proving Establishment. These problems were so acute that only 6 tanks had been produced by mid-1943, and only 100 when production ended in February 1945.

Contents

By mid-1941, officials in the War Office and the British Army had taken the decision that light tanks were no longer to be used by the British Army due to their inferior weapons and armour, as well as their poor performance during the conflict. Consequently, the Mk VIII was obsolete by the time that any significant number of the tanks had been produced, and none ever saw combat. A number of plans were made by the War Office for the design in light of this decision, including equipping reconnaissance units with them, or the unsuccessful idea of attaching wings to them so that aircraft could tow them as gliders into position to support airborne forces; eventually it was decided to hand over those tanks that had been built to the Royal Air Force for use in airfield defence. One variant on the Mk VIII was designed, the Alecto self-propelled gun which was to have mounted a howitzer and used as a close-support vehicle by airborne forces; however only a few were ever produced and they were never used in combat.

Development history

The Mk VIII was the light tank designed by Vickers-Armstrong to be the successor to the Mk VII Tetrarch for the British Army. The company intended that the Mk VIII would improve on the design of the Tetrarch in a number of areas, particularly that of armour protection. It had thicker armour than the Tetrarch, with the frontal hull and turret armour being increased to a thickness of 38 millimetres (1.5 in) and the side armour to 17 millimetres (0.67 in), and the turret and hull were given more sloping surfaces than the Tetrarch to help deflect shells. [2] The dimensions of the Tetrarch design were also changed, with the Mk VIII being longer by 6 inches (0.15 m), wider by 1 foot 3 inches (0.38 m) and its weight being increased; these alterations meant that the tank could no longer be air-portable, as it was too heavy to be carried by the General Aircraft Hamilcar glider. [2]

The same 12-cylinder engine as in the Tetrarch was fitted to the Mk VIII, although the increased weight meant that its maximum speed decreased to 30 miles per hour (48 km/h). The armament remained the same as the Tetrarch's: one machine-gun and a 2 pounder 40-millimetre (1.6 in) main gun. [2] The tank also kept the unusual steering system used in the Tetrarch design; this steering and mechanical system accomplished turns by the lateral movement of road wheels, which bowed the tracks. When the driver turned the steering wheel all eight road wheels not only turned but also tilted in order to bend the tracks and make the tank turn; the idea was to reduce the mechanical strain and waste of power caused by the traditional system used to turn tanks by braking one track. [3] Unlike the Tetrarch, the steering system of the Mk VIII was power-assisted. [1]

Vickers-Armstrong submitted the Mk VIII design to the War Office in September 1941, and in that same month the Tank Board of the War Office ordered 1,000 tanks, increased in November to 2,410. The Board hoped that production could commence in June 1942 at a rate of approximately 100 per month, to be produced by Metro-Cammell, a subsidiary of Vickers-Armstrong. It was also at this time that the tank was given the specification number A25 and given the name of Harry Hopkins [2] Production began in June 1942 as expected, but immediately began to experience problems; these are not specified, but it appears that testing of the prototypes of the Mk VIII provided by Vickers-Armstrong raised a number of issues. A minute sent to the Prime Minister, Winston Churchill, in September from the Ministry of Supply stated that there would be delays in delivery of the tank due to developmental problems, and a report issued by the War Office in December stated that a number of modifications would be required before production could be continued; the front suspension system was singled out as requiring extensive modification. [2] Problems were still being encountered in July 1943, with a report from the Fighting Vehicle Proving Establishment indicating that serious defects were still being found in the models being tested; the problems became so acute that trials of the Mk VIII were abandoned earlier than scheduled. By 31 August 1943 only six Mk VIII tanks had been produced, compared to a War Office requirement of 100 by the beginning of the year. Although the War Office persisted in retaining the design and issued an official requirement in November 1943 for 750 tanks to be built, only around 100 had been built when production officially ended in February 1945. [4]

Operational history

Mk VIII Light Tank GB-VickersLightTank-MarkVIII-HarryHopkins.jpg
Mk VIII Light Tank

By mid-1941 officials at the War Office and in the Army had finally decided that light tanks as a concept were a liability, and too vulnerable to be used by the British Army. [5] This was due to the poor performance of British light tanks during the Battle of France, caused when a shortage of tanks designed to engage enemy tanks had led to light tanks being deployed against German armour; the resulting high casualties led to the War Office rethinking the suitability of the light tank design. [6] The pre-war role of the light tank, that of reconnaissance, had also been found to be better carried out by scout cars which had smaller crews and better cross-country abilities. [5] [6] Consequently, by the time that significant numbers of the Mk VIII were being produced by Metro-Cammell, they had already become obsolete and did not see combat. There was a requirement for a limited number of light tanks within the organization of British armoured divisions, but this had already been met by the American-produced M5 Stuart light tank. [7] A policy report issued in December 1942 suggested that the tank could be issued to reconnaissance regiments or special light tank regiments raised for specialized operations. These suggestions were discussed and discarded, and instead it was decided that those tanks built should be handed over to the Royal Air Force for use in defending airfields and airbases. [1]

The Mk VIII was also discussed in terms of another plan known as the Carrier Wing; in this plan flying surfaces, such as wings, would be fitted to the Mk VIII so that it could be towed by a transport aircraft and then glide into battle in support of airborne forces. The plan was dropped, however, after the prototype crashed after it had taken off. [1]

A single variant of the Mk VIII was designed, the Alecto self-propelled gun. Originally known as the Harry Hopkins 1 CS (for "Close Support"), the Alecto was eventually given the General Staff specification number A25 E2. The Alecto mounted a 95-millimetre (3.7 in) howitzer on a lightweight version of the Mk VIII chassis which had the turret removed so that the howitzer could be placed low down in the hull, and the armour was reduced to a thickness of 10 to 4 mm (0.39 to 0.16 in) to reduce its weight, resulting in a maximum speed of 31 miles per hour (50 km/h). [8] The Alecto was designed to replace the half-tracks carrying support weapons, such as howitzers, which British airborne formations used during the conflict, and was first developed in late 1942. It could also have been used in place of 75mm gun equipped armoured cars. [9] The War Office had ordered 2,200 Alectos but only a small number were ever produced, none of which saw service; many were converted into bulldozers for use by Royal Engineer units. [10]

Footnotes

  1. 1 2 3 4 Fletcher, p. 42
  2. 1 2 3 4 5 Flint, p. 18
  3. Flint, p. 10
  4. Flint, pp. 18-19
  5. 1 2 Bishop, p. 24
  6. 1 2 Flint, p. 12
  7. Flint, p. 19
  8. Flint, pp. 20-21
  9. "British Armoured Car Production Figures 1945 By 1945". Archived from the original on 26 November 2010. based upon June 1945 Report on the Progress of the Royal Armoured Corps
  10. Flint, pp. 21-22

Related Research Articles

<span class="mw-page-title-main">Armoured fighting vehicle</span> Combat vehicle with both armament and armour

An armoured fighting vehicle or armored fighting vehicle (AFV) is an armed combat vehicle protected by armour, generally combining operational mobility with offensive and defensive capabilities. AFVs can be wheeled or tracked. Examples of AFVs are tanks, armoured cars, assault guns, self-propelled artilleries, infantry fighting vehicles (IFV), and armoured personnel carriers (APC).

<span class="mw-page-title-main">M22 Locust</span> Airborne light tank

The M22 Locust, officially Light Tank (Airborne), M22, was an American-designed airborne light tank which was produced during World War II. The Locust began development in 1941 after the British War Office requested that the American government design a purpose-built airborne light tank which could be transported by glider into battle to support British airborne forces. The War Office had originally selected the Light Tank Mark VII Tetrarch light tank for use by the airborne forces, but it had not been designed with that exact purpose in mind so the War Office believed that a purpose-built tank would be required to replace it. The United States Army Ordnance Department was asked to produce this replacement, which in turn selected Marmon-Herrington to design and build a prototype airborne tank in May 1941. The prototype was designated the Light Tank T9 (Airborne), and was designed so that it could be transported underneath a Douglas C-54 Skymaster transport aircraft, although its dimensions also allowed it to fit inside a General Aircraft Hamilcar glider.

<span class="mw-page-title-main">Valentine tank</span> British infantry tank

The Tank, Infantry, Mk III, Valentine was an infantry tank produced in the United Kingdom during World War II. More than 8,000 of the type were produced in eleven marks, plus various specialised variants, accounting for approximately a quarter of wartime British tank production. The many variants included riveted and welded construction, petrol and diesel engines and a progressive increase in armament. It was supplied in large numbers to the USSR and built under licence in Canada. It was used extensively by the British in the North African campaign. Developed by Vickers, it proved to be both strong and reliable.

<span class="mw-page-title-main">Cromwell tank</span> British WWII cruiser tank

The Cromwell tank, officially Tank, Cruiser, Mk VIII, Cromwell (A27M), was one of the series of cruiser tanks fielded by Britain in the Second World War. Named after the English Civil War-era military leader Oliver Cromwell, the Cromwell was the first tank put into service by the British to combine high speed from a powerful, reliable engine and reasonable armour. The intended dual-purpose high velocity gun could not be fitted in the turret, so a medium velocity dual purpose gun was fitted instead. Further development of the Cromwell combined with a high velocity gun led to the Comet tank.

<span class="mw-page-title-main">Cruiser Mk I</span> British cruiser tank

The Tank, Cruiser, Mk I (A9) was a British cruiser tank of the interwar period. It was the first cruiser tank: a fast tank designed to bypass the main enemy lines and engage the enemy's lines of communication, as well as enemy tanks. The Cruiser Mk II was a more heavily armoured adaptation of the Mark I, developed at much the same time.

<span class="mw-page-title-main">Cruiser Mk II</span> British cruiser tank

The Tank, Cruiser, Mk II (A10), was a cruiser tank developed alongside the A9 cruiser tank, and was intended to be a heavier, infantry tank version of that type. In practice, it was not deemed suitable for the infantry tank role and was classified as a "heavy cruiser". It served briefly in World War II.

<span class="mw-page-title-main">Cruiser tank</span> Tank

The cruiser tank was a British tank concept of the interwar period for tanks designed as modernised armoured and mechanised cavalry, as distinguished from infantry tanks. Cruiser tanks were developed after medium tank designs of the 1930s failed to satisfy the Royal Armoured Corps. The cruiser tank concept was conceived by Giffard Le Quesne Martel, who preferred many small light tanks to swarm an opponent, instead of a few expensive and unsatisfactory medium tanks. "Light" cruiser tanks carried less armour and were correspondingly faster, whilst "heavy" cruiser tanks had more armour and were slightly slower.

<span class="mw-page-title-main">Infantry tank</span> Tank

The infantry tank was a tank concept developed by the United Kingdom and France in the years leading up to World War II. Infantry tanks were designed to support infantrymen in an attack. To achieve this, the vehicles were generally heavily armoured to allow them to operate in close concert with infantry even under heavy fire. The extra armour came at the expense of speed, which was not an issue when supporting relatively slow-moving foot soldiers.

<span class="mw-page-title-main">Ordnance QF 2-pounder</span> Tank gun and anti-tank gun

The Ordnance QF 2-pounder, or simply "2 pounder gun", was a 40 mm (1.575 in) British anti-tank gun and vehicle-mounted gun employed in the Second World War.

<span class="mw-page-title-main">Alecto (SPG)</span> British self propelled gun from WWII

The Alecto, initially known as the Harry Hopkins Mk 1 CS, was a self propelled gun developed by the British during World War II.

<span class="mw-page-title-main">Mk VII Tetrarch light tank</span> British light tank

The Light Tank Mk VII (A17), also known as the Tetrarch, was a British light tank produced by Vickers-Armstrongs in the late 1930s and used during the Second World War. The Tetrarch was the latest in the line of light tanks built by the company for the British Army. It improved upon its predecessor, the Light Tank Mk VIC, by introducing the extra firepower of a 2-pounder gun. The War Office ordered 70 tanks, an order that eventually increased to 220. Production was delayed by several factors and only 100 to 177 of the tanks were produced.

<span class="mw-page-title-main">Mk VI light tank</span> British light tank during the Second World War

The Tank, Light, Mk VI was a British light tank, produced by Vickers-Armstrongs in the late 1930s, which saw service during the Second World War.

<span class="mw-page-title-main">General Aircraft Hamilcar</span> British assault glider of the Second World War

The General Aircraft Limited GAL.49 Hamilcar or Hamilcar Mark I was a large British military glider produced during the Second World War, which was designed to carry heavy cargo, such as the Tetrarch or M22 Locust light tank. When the British airborne establishment was formed in 1940 by the order of Prime Minister Winston Churchill it was decided to develop a large glider which would be able to transport heavy equipment in support of airborne troops. General Aircraft Limited were chosen in January 1941 to develop this glider, which they designated the GAL.49 'Hamilcar'. It was designed to transport a light tank or two Universal Carriers. A number of problems, which included vacillation by the War Office on the number of gliders it wanted and poor management by GAL, led to delays in the production of the Hamilcar and it was not until mid-1943 that the first production glider was assembled. These problems were only partially solved and production of the glider continued to be slow, hampered by difficulties in finding suitable locations to store and construct them once their parts were produced. A total of 344 Hamilcars had been built when production ended in 1946.

<span class="mw-page-title-main">Light tanks of the United Kingdom</span> Light tank

The Light Tank Mark I to Mark V were a series of related designs of light tank produced by Vickers for the British Army during the interwar period.

This article lists British armoured fighting vehicle production during the Second World War. The United Kingdom produced 27,528 tanks and self-propelled guns from July 1939 to May 1945, as well as 26,191 armoured cars and 69,071 armoured personnel carriers.

The British Army made extensive use of a variety of combat vehicles during the Second World War. This article is a summary of those vehicles.

<span class="mw-page-title-main">Light tank</span> Class of tank

A light tank is a tank variant initially designed for rapid movements in and out of combat, to outmaneuver heavier tanks. It is smaller in size with thinner armor and a less powerful main gun, tailored for better tactical mobility and ease of transport and logistics. They are primarily employed in the screening, armored reconnaissance, skirmishing, artillery observation, and supplementing landing operations in a fire support role of expeditionary forces where larger, heavier tanks are unavailable or have difficulties operating safely or efficiently.

<span class="mw-page-title-main">Tanks in the British Army</span>

This article on military tanks deals with the history and development of tanks of the British Army from their first use in the First World War, the interwar period, during the Second World War, the Cold War and modern era.

<span class="mw-page-title-main">Tanks of New Zealand</span> Use of tanks by the New Zealand Army

The New Zealand Army use of tanks from after the First World War, through the interwar period, the Second World War, the Cold War and to the present day has been limited, but there is some history. The New Zealand armed forces developed in the early twentieth century but served alongside the British and other Empire and Commonwealth nations in World War I and World War II.

References