The Chieftain Tank is one of the best known of the present generation
of battlefield weapons, and is one of the most heavily armoured and
armed fighting vehicles in service anywhere today. It has not been
without its detractors or critics, however, and there has been a
running debate by military commentators for several years past on the
relative merits of the British Chieftain Tank compared with the main
battle tanks of other great military powers- the United States, Soviet
Russia, France and West Germany - whose present equivalent designs
afford a fascinating contrast with Chieftain in many key aspects.
The Chieftain, however, was developed as a result of British tank
experience in World War II and after, and reflects the priorities which
British tank men felt to be the most important terms of firepower,
protection and mobility. British tank development in World War II
resulted in the famous Centurion, which first appeared in 1945 in the
closing weeks of the war. The Centurion, together with the Soviet
T-34/85, and German Panther, represented the culmination of thinking
(arising from actual experience) which pointed the need for a
"universal" tank had, meanwhile, been disturbed by the appearance of
the Soviet Josef Stalin II tank in 1945, with a powerful 122mm gun.
In the Immediate post-war years it became clear that Soviet Russia and
her East European allies (later the Warsaw Pact powers) posed the
greatest threat to Western Europe in any future conflict, and this led,
subsequently, to the setting up of NATO. If war broke out, much of the
initial fighting at least would take place in Europe, notably in
Northern Germany, and Britain's armoured divisions were either located
in or earmarked for deployment to Germany. The backbone of the Soviet
armoured divisions in the 1950's was the formidable JS-III and its T-1-
derivative, both with the 122mm gun, which could out shoot the 20 pdr.
(84 mm)gun of the early service versions of Centurion. To strengthen
the firepower of the Centurion, therefore, the British developed an
introduced a "heavy tank gun", the conqueror with a 120mm gun
specifically to match the Stalin. The Centurion at this time was
classed as a "medium gun tank". The Conqueror was unsatisfactory in
many ways; it was very heavy, noisy, relatively slow, and made an extra
logistic liability for relatively few vehicles. By 1066 the Conqueror
was withdrawn from service and an up gunned Centurion with 105 mm gun
was in service.
More significant still, however, was that the British by this time had
a new tank in production, the Chieftain, which was to replace both the
Centurion and Conqueror, with firepower superior to both. Initial
studies for a new "medium tank gun" to replace these two tanks started
in the early 1950's and by 1954 some definite proposals had been
formulated by the British General Staff. It was planned that the new
vehicle should not exceed 50 tons in weight, should have a gun of 120mm
calibre, low sloped superstructure, particularly at the front, and a
new, compact V-8 engine instead of the Meteor engine of the Centurion.
It was originally thought that the maximum calibre of the gun would be
no greater than 105mm, due to the weight and size of the 120mm round in
a vehicle of relatively small size, buth this problem was overcome by
developing a 120mm round with bagged, as opposed to cased charges, as
used in large calibre naval guns. In the event, the 105mm gun was
developed and fitted to later marks of the Centurion, and the 120mm gun
became feasible for the new design. The new tank was originally
designated "Medium Gun Tank No.2 FV 4201" and the contract for design
work went to Leyland Motors, who had been main contractors for
Centurion.
Some fairly radical design features were involved in FV 4201, quite
apart from the proposed 120mm gun. To give a low sloped hull, it was
decided to dispense with the conventional seated driving position and
give the drive a semi reclining station, central in the hull front. A
sloped, faceted glacis, quite similar to that of the Stalin tank, was
featured in early design studies, though this evolved into a flatter
sloped and cast nose in the final design. To give the best ballistic
shape to the turret it was to have sloped, pointed front, eliminating
the wide mantlet of earlier tanks. The well-tried Horstmann suspension,
as used in the Centurion, was to be retained. In order to test the
feasibility of the new requirements, Lelyland built a running prototype
in 1956, largely based on Centurion components. Popularly known as the
"40 ton Centurion", but designated FB4202 and intended only for test
purposes, this vehicle featured both a semi-reclining driver position
and a pointed cast turret front. There was still much development work
to do, however, notably the need to develop a new engine capable of
running on several different types of fuel in accordance with a new
NATO policy decision introduced in 1957. Leyland came up with a new
motor, the L60, which was a two stroke with vertically opposed pistons,
developed from a German compression ignition design. This work caused
the whole programme to be delayed and further complicated, for the
entire rear end of the vehicle had to be re-designed to take the new
engine, taking the weight above the originally scheduled 50 tons in the
process. Ironically, also, troubles with this engine hampered the
vehicle even after it reached production and service status.
A finalised specification for the FV4201 was drawn up in 1958, and a
wood mock-up was ready by early 1959. By this time the design contract
had been passed from Leyland to Vickers-Armstrong, the speed
requirement had been increased to a maximum of 26 mph, with a range of
300 miles, and there was an increase in elevation and depression of the
gun to improve the maximum and minimum ranges.
The first running prototype, without a turret, was ready in late 1959,
and six prototypes with turrets were delivered for army trials in
1961-62. Various changes were introduced early on. The design
originally had smaller road wheels than the Centurion, but this gave a
ground clearance of only 17 inches, which proved too low. The problem
was overcome by reverting to the same road wheels as the Centurion, and
increasing ground clearance to 22 inches in the procerss. Rubber pads
were added to the tracks to prevent damage to public roads, and the
exhaust system was much modified following some technical changes to
prevent the gearbox from overheating.
The characteristics of the FV4201, subsequently known as the Chieftain
Main Battle Tank, have not changed greatly since its first appearance,
though there have been several detail changes. The outstanding feature
of the vehicle is, of course, its L11 120 mm gun. This can fire APDS
(armour piercing discarding sabot), and HESH/HE (high explosive squash
head/high explosive) ounds with all charges inbagged form.
Fire-resistant stowage is provided for the bagged charges. A ranging
machine gun is fitted integral with the main armament, and is linked to
the sight with graticule marks scaled for the appropriate types of
ammunition. Rapid sight correction is possible by direct observation of
the raging machine gun strikes on the target. This basically simple
optical ranging technique was first developed for later marks of
Centurion, and its reputation as a "foolproof" and accurate system has
been further enhanced in the Chieftain, and has given British tank
gunners a "second to none" record, with a good chance of a direct hit
with the first round away - important considerations when ammunition
capacity in the tank is limited, and when the potential enemy may have
superior numbers of tanks. For indirect fire the conventional type of
ranging drum and elinometer are used. A contra rotating cupola with
hand traverse enables the commander to select and indicate the targets
rapidly, and a sight linked to the gunner's sight enables the commander
to aim the gun from the cupola position. A GP machine gun is fitted to
the cupola and can be aimed and fired remotely with the cupola closed
down. The commander's main binocular sight is fitted in the rotating
part of the cupola with the fixed part of the cupola containing nine
periscopes to give an all-round view. The gun is stabilised in
elevation and the turret is stabilised in azimuth, so that the gun can
be fired with a high degree of accuracy even while the vehicle is
moving. There is a light projector in a box on the left side of the
turret, offering either white light or intra-red light for night
fighting, the system being linked for elevation with the gunner's sight
enables the commander to aim the gun from the cupola position. A GP
machine gune is fitted to the cupola and can be aimed and fired
remotely with the cupola closed down. The commander's main binocular
sight is fitted in the rotating part of the cupola with the fixed part
of the cupola containing nine periscopes to give an all-round view. The
gun is stabilised in elevation and the turret is stabilised in azimuth,
so that the gun can be fired with a high degree of accuracy even while
the vehicle is moving. There is a light projector in a box on the left
side of the turret, offering either white light or infra-red light for
night fighting, the system being linked for elevation with the gunner's
sight. The gunner and the commander have optical infra-red converters
for their sights, and the commander's spotlight can be fitted with an
infra-red filter. The driver's reclining position is flanked by battery
and ammunition stowage, and he has a periscope behind his hatch. There
are conventional steering levers with epicyclic gearbox and Merritt
differential transmission. Transmission is automatic with foot pedal
gearchange selector. The superstructure overhangs the tracks to give
the necessary turret ring radius. Both the hull and turret fronts are
complex castings, and the hull front is said to have given some
problems in the casting when production first started.
Development of the Chieftain since it entered production is best seen
by summarising the various models: Chiftain Mk. I: About 40 of these
vehicles were built, largely for extended troop trials and training.
After test service with 1st and 5th RTR, the type was cleared for
service in 1963. A distinguishing feature was the split hatches to the
cupola similar to those on later types of Centurion.
Chieftain MK. 2: This was the definitive production version which first
went into service (with the 11th Hussars) in 1967. It had a one piece
cupola hatch and special ventilation equipment on the turret rear to
enable the vehicle to operate closed down in nuclear and biologival
warfare conditions. The armour plating on the light projector was
reduced, round stowage reduced, and snorkel wading equipment was
supplied in place of a floatation kit originally envisaged. This type
saw extensive service in the late 1960's and early 1970's, and indeed,
the Chieftain rapidly replaced the Centurion as the British Army's main
battle tank once production was under way. Special purpose models- a
recovery vehicle, AURE, and bridgelayer have appeared.
Chieftain Mk 3: This version appeared in 1969 and had a better
auxiliary generator and detail improvements to the engine. The L60
engine proved complex, and successive marks of the Chieftain have had
the engine gradually uprated to give the full designed power output. An
improved cupola, and modified internal stowage were other changes.
Chieftain Mk 3/3: This saw a big step forward, in that the fire control
arrangements were modified so that an advanced laser sight for the
gunner can be fitted.
Chieftain Mk 5: First announced in 1970, this was the main type in
service in the mid 1970's. Further engine modifications bring the power
output up to 750bph, with consequent improvement in overall
performance, and revision of the ammunition stowage arrangements
enabled 64 rounds to be stowed. Splash plates have been added on the
glacis.
The Chieftain has been compared, inevitably, with the French AMX-30,
the West German Leopard, and the US M60A1. All these tanks have speed
and mobility superior to the Chieftain and are lighter in weight. They
also have the 105 mm gun and are inferior to the Chieftain in firepower
and armour. Whether mobility or firepower will be the most crucial to
top quality in any European major war has yet to be put to the test,
but the pace of the technology in armoured warfare is relentless. The
Soviets have made big progress with fin-established ammunition (in
their T-62 and new T-72 battle tanks) and the Israeli-Arab "Yom Kippur"
war of October, 1973 showed for the first time that the main battle
tank was very vulnerable to tactical anti-tank missiles skilfully
employed. It may be, therefore, that the Chieftain could be the last of
the traditional type of tank in the form in which it has been accepted
for many years past. Whatever the future, however, Chieftain remains an
exciting and powerful fighting vehicle. It has been ordered by the
Iranian Army and has interested many others, though the great expense
of one of these vehicles limits their availability.
General
Physical Specification
| Package Contents: |
1x Tamiya British Chieftain MK.V Tank (1/35)
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