Medium Mark B
Encyclopedia
The Medium Mark B was a British tank
of the First World War developed as a successor to the Whippet, but ultimately unsatisfactory and production was cancelled at the end of the war.
and the industrialist Sir William Tritton had cooperated in 1915 to develop the Mark I, the world's first tank. However, when Tritton decided to build the Medium Mark A "Whippet", Wilson was left out. The Medium A was designed by Tritton's chief engineer, William Rigby.
The Whippet was a successful design and proved effective but suffered from a lack of power, complex steering and unsprung suspension. Wilson, now a Major, decided he could by himself develop a better tank as replacement: the 'Medium Tank Mark B'. He probably started drawing in July 1917. Major Philip Johnson of Central Tank Workshops was impressed when he was shown a wooden mock-up during a visit to Britain late 1917. The prototype was built by Tritton's firm, the Metropolitan Carriage and Waggon Company, and was finished in September 1918.
It seems that early in the design process Wilson considered building an alternative or parallel Male version fitted with a 2-pounder (~40 mm gun) in the superstructure but he had abandoned these plans by March 1918.
The design by Wilson had elements of both the Mark I and the Whippet: a similar but smaller tracked rhomboid chassis of the former and fixed turret like the latter. A novel feature was the separate compartment in the back, housing the 100 hp (75 kW) engine (a four-cylinder shortened Ricardo
design) and behind it the epicyclic transmission. Two fuel tanks at the back held 85 imperial gallons (386 L) of petrol. Other innovations were the ability to lay a smoke screen and the use of sloped armour
in the front of the hull. The smoke screen device consisted of a sulphonic acid reservoir located over the exhaust pipe. Armament consisted of a maximum of five machine guns in the superstructure and two in the side doors. These hull doors looked a bit like miniature sponsons. The machine guns were removable and in practice fewer guns would have been taken along, the machine-gunner moving his gun when switching position; most sources give an estimate of four.
A production of 450 vehicles had been ordered even before the prototype was finished and this number was now increased to 700, to be manufactured at North British Locomotive in Glasgow
and later at Metropolitan, Coventry Ordnance Works
and the Patent Shaft and Axletree Company. Confusingly the new tank was to have the same name as the Mark A: "Whippet". Almost immediately after having been taken into use, the type fell from grace for two reasons. Firstly the engine compartment couldn't be easily accessed from the fighting compartment. Repair under fire would therefore have been very dangerous. Secondly Tritton had constructed a rival type: the Medium Mark C
"Hornet". This other design had superior speed and trench crossing abilities. Wilson had limited the size of the Mark B to that of a single railway flatcar. The end of the war led to cancellation after 102 were produced out of the first order for 450. Of these only 45 were taken into service by the British Army
, the remaining 57 probably going straight to the scrapyard.
After the war the type was quickly phased out in favour of the Mark C. Two vehicles were used by the North Russian Tank Detachment. Both were lost and the Red Army
used at least one until the Thirties. The last British unit to have the Mark B in service was 17th (Armoured Car) Battalion during the Anglo-Irish War.
Tank
A tank is a tracked, armoured fighting vehicle designed for front-line combat which combines operational mobility, tactical offensive, and defensive capabilities...
of the First World War developed as a successor to the Whippet, but ultimately unsatisfactory and production was cancelled at the end of the war.
History
The engineer Lieutenant Walter G. WilsonWalter Gordon Wilson
Major Walter Gordon Wilson was an engineer and member of the British Royal Naval Air Service. He was credited by the 1919 Royal Commission on Awards to Inventors as the co-inventor of the tank, along with Sir William Tritton....
and the industrialist Sir William Tritton had cooperated in 1915 to develop the Mark I, the world's first tank. However, when Tritton decided to build the Medium Mark A "Whippet", Wilson was left out. The Medium A was designed by Tritton's chief engineer, William Rigby.
The Whippet was a successful design and proved effective but suffered from a lack of power, complex steering and unsprung suspension. Wilson, now a Major, decided he could by himself develop a better tank as replacement: the 'Medium Tank Mark B'. He probably started drawing in July 1917. Major Philip Johnson of Central Tank Workshops was impressed when he was shown a wooden mock-up during a visit to Britain late 1917. The prototype was built by Tritton's firm, the Metropolitan Carriage and Waggon Company, and was finished in September 1918.
It seems that early in the design process Wilson considered building an alternative or parallel Male version fitted with a 2-pounder (~40 mm gun) in the superstructure but he had abandoned these plans by March 1918.
The design by Wilson had elements of both the Mark I and the Whippet: a similar but smaller tracked rhomboid chassis of the former and fixed turret like the latter. A novel feature was the separate compartment in the back, housing the 100 hp (75 kW) engine (a four-cylinder shortened Ricardo
Harry Ricardo
Sir Harry Ricardo was one of the foremost engine designers and researchers in the early years of the development of the internal combustion engine....
design) and behind it the epicyclic transmission. Two fuel tanks at the back held 85 imperial gallons (386 L) of petrol. Other innovations were the ability to lay a smoke screen and the use of sloped armour
Sloped armour
Sloped armour is armour that is neither in a vertical nor a horizontal position. Such "angled" armour is often mounted on tanks and other armoured fighting vehicles...
in the front of the hull. The smoke screen device consisted of a sulphonic acid reservoir located over the exhaust pipe. Armament consisted of a maximum of five machine guns in the superstructure and two in the side doors. These hull doors looked a bit like miniature sponsons. The machine guns were removable and in practice fewer guns would have been taken along, the machine-gunner moving his gun when switching position; most sources give an estimate of four.
A production of 450 vehicles had been ordered even before the prototype was finished and this number was now increased to 700, to be manufactured at North British Locomotive in Glasgow
Glasgow
Glasgow is the largest city in Scotland and third most populous in the United Kingdom. The city is situated on the River Clyde in the country's west central lowlands...
and later at Metropolitan, Coventry Ordnance Works
Coventry Ordnance Works
Coventry Ordnance Works was a British manufacturer of heavy guns, particularly naval artillery. The firm was based in the English city of Coventry.-History:...
and the Patent Shaft and Axletree Company. Confusingly the new tank was to have the same name as the Mark A: "Whippet". Almost immediately after having been taken into use, the type fell from grace for two reasons. Firstly the engine compartment couldn't be easily accessed from the fighting compartment. Repair under fire would therefore have been very dangerous. Secondly Tritton had constructed a rival type: the Medium Mark C
Medium Mark C
The Medium Mark C Hornet was a British tank developed during the First World War, but produced too late to see any fighting.-Development:In 1917 Sir William Tritton had developed the Medium Mark A Whippet without involving his former co-worker Walter Gordon Wilson. In response Major Wilson began to...
"Hornet". This other design had superior speed and trench crossing abilities. Wilson had limited the size of the Mark B to that of a single railway flatcar. The end of the war led to cancellation after 102 were produced out of the first order for 450. Of these only 45 were taken into service by the British Army
British Army
The British Army is the land warfare branch of Her Majesty's Armed Forces in the United Kingdom. It came into being with the unification of the Kingdom of England and Scotland into the Kingdom of Great Britain in 1707. The new British Army incorporated Regiments that had already existed in England...
, the remaining 57 probably going straight to the scrapyard.
After the war the type was quickly phased out in favour of the Mark C. Two vehicles were used by the North Russian Tank Detachment. Both were lost and the Red Army
Red Army
The Workers' and Peasants' Red Army started out as the Soviet Union's revolutionary communist combat groups during the Russian Civil War of 1918-1922. It grew into the national army of the Soviet Union. By the 1930s the Red Army was among the largest armies in history.The "Red Army" name refers to...
used at least one until the Thirties. The last British unit to have the Mark B in service was 17th (Armoured Car) Battalion during the Anglo-Irish War.