PT-76 explained

PT-76
Type:Amphibious light tank
Is Vehicle:yes
Is Uk:yes
Service:1951–present
Designer:N. Shashmurin and Zh.Y. Kotin
Design Date:1949–1951
Manufacturer:VTZ, Kirov Factory
Production Date:1951–1969 (chassis maybe still produced)
Number:Around 12,000. (Other sources indicate 5000 were built. See footnote 3).
Spec Label:PT-76 model 1
Weight:14.6abbr=onNaNabbr=on
Length:7.63abbr=onNaNabbr=on (gun forward)
6.91m (22.67feet) (hull)
Width:3.15m (10.33feet)
Height:2.325m (07.628feet)
Crew:3 (driver, commander/gunner, loader)
Armour:RHAe
Primary Armament:76.2 mm D-56T rifled tank gun (40 rds.)
Secondary Armament:7.62 mm SGMT coax machine gun (1,000 rds.) or
7.62 mm PKT machine gun coax machine gun (1,000 rds) since 1967
Engine:19.1L 6 cylinder inline diesel
Engine Power:240hp
Pw Ratio:12.3 kW/t
Suspension:torsion-bar
Clearance:370 mm (14.6 in)
Fuel Capacity:250L
Vehicle Range:370–
480– with external fuel
Speed:44km/h on road, 10.2km/h swimming

The PT-76 is a Soviet amphibious light tank that was introduced in the early 1950s and soon became the standard reconnaissance tank of the Soviet Army and the other Warsaw Pact armed forces. It was widely exported to other friendly states, like India, Indonesia, Iraq, Syria, North Korea and North Vietnam.

The tank's full name is Floating Tank–76 (Russian: плавающий танк, plavayushchiy tank, or Russian: ПТ-76). 76 stands for the caliber of the main armament: the 76.2 mm D-56T series rifled tank gun.

The PT-76 is used in the reconnaissance and fire-support roles. Its chassis served as the basis for a number of other vehicle designs, many of them amphibious, including the BTR-50 armored personnel carrier, the ZSU-23-4 self-propelled antiaircraft gun, the ASU-85 airborne self-propelled gun and the 2K12 Kub anti-aircraft missile launch vehicle.

Development

After World War II, the concept of light tanks was resurrected in the USSR. They were to be used in reconnaissance units and therefore an amphibious ability was essential. The requirements stated that the vehicle should be able to cross water obstacles with little preparation. Many prototypes of such light tanks were built in the late 1940s. The most successful was "объект 740" (Object 740) designed by the engineer N. Shashmurin working at the VNII-100 institute in Leningrad (a research institute of Chelyabinsk Tank Factory ChTZ) in 1949–1950, under an initial supervision of Josef Kotin from Kirov Plant.[1] The vehicle was successful because it had a simple design, good navigational traits and a good cross country capability. At the time, its water-jet design was innovative.[2]

A prototype was built at Kirov Plant in 1950 and the tank was officially adopted on 6 August 1951 with the designation PT-76.[3] Production started at the Stalingrad Tractor Factory (STZ). The tank was subsequently modified. In 1957, the D-56T gun was replaced with the D-56TM - with double-baffle muzzle brake and fume extractor - and the hull was raised by 13 cm, additionally the tank was equipped with new vision and communications devices. First series tanks were subsequently modified, receiving the D-56TM gun and new equipment. In 1959 an improved variant, the PT-76B, was adopted and remained in production until 1967 (main improvements were: D-56TS gun with stabilization and CBRN protection).

In 1964 the United States obtained a PT-76 by undisclosed means. The tank was evaluated by the Tank-Automotive Center in February, and was deemed inferior to existing light American tanks.[4]

Design

The PT-76 has a typical tank layout: the steering compartment at the front, the combat compartment in the center and the engine compartment at the back. The tank has a three-man crew, with the commander also acting as the radio operator and gunner. This reduces his effectiveness as an observer. The commander and loader stations are located inside the turret, the commander sits on the left side of the main gun and the loader sits on the right. They have a large oval shaped double hatch, which opens forwards on top of the turret. The driver sits in the center of the front of the hull and has a one piece hatch that opens to the right, with three vision blocks and periscopes located beneath the main gun at the top of the sloping glacis plate. Under the driver's seat, there is an emergency hatch that can be used by all crew members. At night, the center periscope is swapped for a TVN-2B night vision device which gives the driver clear vision up to 60 meters.[5] [6]

Armament

Its main armament consists of a 76.2 mm D-56T series rifled tank gun, which has an effective range of approximately 1,500 meters and a rate of fire of six to eight rounds per minute. This gun is 42 calibers long. The PT-76 carries 40 rounds for its gun. A typical ammunition load consists of 24 x OF-350 Frag-HE, 4 x AP-T, 4 x API-T and 8 x BK-350M HEAT rounds (with AP-T rounds substituted for HVAP when available). The gun is mounted in an oval dish-type circular truncated cone turret with flat, sloping sides which is mounted over the second, third, and fourth pair of road wheels. All PT-76s have a fume extractor for the main gun at the rear of the turret.[7] [5]

The 7.62 mm SGMT coaxial medium machine gun comes with 1,000 rounds. This weapon has a maximum effective range of 1,000 meters in daylight while the vehicle is stationary, 400 to 500 meters in daylight while the vehicle is on the move and 600 meters at night. Maximum range is 1,500 meters. It can be fired in 2 to 10 round bursts and has a practical rate of fire of 250 rounds per minute and a cyclic rate of fire of 650 rounds per minute. From 1967, the machine gun was replaced with PKT of the same caliber.[5]

The main gun, which is considered light for a modern tank, can fire BM-354P HVAP, API-T, AP-T, BR-350 API-T and OF-350 Frag-HE rounds (as can the 76.2 mm M1942 (ZiS-3) divisional gun) and is capable of penetrating the armour of APCs and other lightly armored vehicles.

The commander/gunner has a cupola on the left side of the double hatch. The cupola has the TPKU-2B observation device and two TNP day periscopes and can be rotated 360 degrees by hand. The commander also has a 4X optical sight mounted to the left of the main armament and a TShK-66 sight/rangefinder. The loader has the MK-4 observation device mounted on the turret's roof in front of the hatch.

Ammunition

The BM-354P High Velocity Armor Piercing (HVAP) round has a maximum effective range of 650 meters by day and 600 meters at night. Its maximum aimed range is 1,060 meters. It can penetrate 127 mm of armour at muzzle and 50 mm at 1,000 meters. The armour-piercing round can pierce 60 mm of armor inclined at 60 degrees from a range of 2,000 meters. The BK-350M High Explosive Anti Tank or HEAT round has a maximum effective range of 650 meters by day and 600 meters at night. Its maximum range is 1,000 meters. It can penetrate 280 mm of armour at 1,000 meters. The OF-350 Frag-HE round has a maximum effective range of 600 meters at night and a maximum range of 4,000 meters. The gun can be fired while the vehicle is afloat. The gun can also be depressed and elevated between −4 and +30 degrees so like most Soviet tanks, the PT-76 has a limited ability to depress its main gun, and therefore can have difficulty finding a hull down fire position on higher ground. One of the greatest disadvantages of the gun used on the PT-76 Model 1 was that it had no stabilization system and therefore couldn't be effectively fired while the vehicle was on the move. The PT-76 Model 2 has a 1-axis stabilization system and the PT-76B has a 2-axis system.

Countermeasures

The armor of the PT-76 consists of homogeneous, cold-rolled, welded steel. Its turret has 20 mm at 35° at the front, 16 mm at 35° at the sides, 11 mm at 33° at the rear and 8 mm at 0° on top of the turret. The hull is made up of: 10 mm at 80° at the upper front, 13 mm at 80° at the lower front, 14 mm at 0° at the sides, 7 mm at 0° in the rear and 5 mm at 0° underneath. This gives it protection against 7.62 mm small arms fire and small artillery shell fragments. It does not protect it against 12.7 mm or .50-caliber armor-piercing heavy machine gun fire or larger shell fragments.[5] [8]

Mobility

Land

The torsion bar suspension consists of six evenly spaced large rubber-tired road wheels with the drive sprocket at the rear and the idler at the front. The road wheels are hollow to minimize weight. These hollow road wheels increase the tank's buoyancy by 30%. There are no track-return rollers. The first and last road wheels have a hydraulic shock absorber and the steel tracks have 96 links each when new, each link has a single pin. There is a small, thin, horizontal skirt over each track. Its straight 6-cylinder, 4-stroke water-cooled diesel engine was developed under the designation "V-6" by halving the "V-12"-engine from the T-54/55. It develops 240 hp (179 kW) at 1,800 rpm which gives it a road speed of 44 km/h and a range of 370 km to 400 km. The vehicle can cross 1.1 m high vertical obstacles and 2.8 m wide trenches and climb 52° gradients. The engine has a cooling system and an initial heater (intended for use when the air temperature is −20 °C or colder). The PT-76 has a 5-speed manual shaft-type transmission system similar to the one in the T-34/85. The gearbox has four forward gears and one reverse. The vehicle has a side clutch that enables it to make turns and a handbrake. The tank has four mounts for additional external fuel tanks at the rear of the hull. The two on the corners are for flat type external tanks and the two in the center are for a drum type. These additional tanks increase the range from 370 to 400 km to 480–510 km. The PT-76 is a reliable, simple to operate and highly mobile reconnaissance vehicle and is ideally designed for amphibious operations, but it has many limitations as a fighting vehicle.[5] [9] [10]

Water

The PT-76 is amphibious, it has a flat, boat-shaped hull which is hermetical and ensures minimal resistance when the tank is afloat. It can swim after switching on the two electric bilge pumps, erecting the trim vane which improves the vehicle's stability and displacement in the water and prevents water from flooding into the bow of the tank. Switching the driver's periscope for a swimming periscope enables the driver to see over the trim vane. When not in use the trim vane is stowed in the front of the bow under the barrel of the main gun and serves as additional armor. Bilge pumps keep the tank afloat even if it leaks or is damaged. There is a manual bilge pump for emergency use. The tank is propelled through the water by two hydrojets, one on each side of the hull, with the inlets underneath the hull and the outlets at the rear. There are also additional assistant water-jet inlets on both sides of the hull over the last road wheels. The rear outlets have lids that can be fully or partially closed, redirecting the water stream to the forward-directed outlets at the sides of the hull, thus enabling the vehicle to turn or go in reverse. To turn to the left for example, the left water-jet is covered, to turn to the right, the right water-jet is covered. To make a 180° turn, one water-jet sucks in water while the other pushes it out. This system was designed by N. Konowalow. It is the same system as the one used in the BTR-50 APC, which was based on the PT-76. The tank can swim at up to 10.2 km/h and has a range of 100 km. It can cross most water obstacles and can also swim in the sea. However, its amphibious design makes it disproportionally large for a vehicle of its weight and allows less armor protection than other light tanks.[5]

Equipment

The PT-76 is equipped with a tank communication device, a gyro compass, a 10-RT-26E radio with an antenna that extends itself when needed. It also has two headlights in front of the hull and a searchlight on the right-hand side of the top of the turret. It lagged behind other Soviet armoured fighting vehicles because only the driver had a night vision device and also because it has no fire or NBC (nuclear, biological, chemical) protection systems, which significantly reduced its effectiveness. The lack of NBC protection ended with the PT-76B, which has the PAZ ("protivo-atomnaya zashchita") NBC protection system. Because only the driver has night vision equipment, the crew has a vision range of 4000-3NaN-3 by day and 600-3NaN-3 at night.[5]

Service history

About 5,000 PT-76s were built during the vehicle's lifetime, of which some 2,000 were exported. Other sources indicate that 12,000 were built. (See footnote 1). Over 25 countries employed the vehicle, including Afghanistan, Albania, Angola, China, Congo, Cuba, Egypt, Finland, Guinea, Hungary, India, Indonesia, Iraq, Laos, Madagascar, Mozambique, North Korea, Pakistan, Poland, North Vietnam, and Yugoslavia.

The PT-76 was used as the standard reconnaissance tank of the Soviet Union and Warsaw Pact armies. It was also intended for water obstacle fording operations and naval infantry landings. It served in the reconnaissance subunits of tank divisions and mechanized divisions of the Red Army and Soviet marines divisions. Although it has been replaced in front line service by the BMP-1, it may still be found in the reconnaissance companies and battalions of some motorized rifle and tank regiments and divisions, as well as in naval infantry units. Aside from its reconnaissance role, it is also used for crossing water obstacles in the first wave of an attack and for artillery support during the establishment of a beachhead.[11] [12] [13] The main disadvantage of the BMP-1 and the BRM-1 when compared to the PT-76 is the absence of a powerful main armament. However, the BRM-1 is fitted with more modern reconnaissance equipment. Also, both vehicles have stronger front armor and superior mobility features and the BMP-1 can carry up to 8 fully equipped soldiers inside. The PT-76 is still on active service in a number of countries mainly in the developing world. The Russian Army is reported to have used PT-76 units in the war in Chechnya.[14]

The PT-76 is used/stationed by/in following Russian units/bases: 61st tank repair plant (1), 61st Kirkinesskaya marine brigade (26) from Sputnik, which is part of the Murmansk military district, 175th marine brigade (26) from Tumannyy, which is part of the Murmansk military district and 336th Belostokskaya marine brigade (26) from Baltyysk, which is part of the Kaliningrad military district.[15]

In Ludowe Wojsko Polskie (LWP), PT-76s and PT-76Bs were used by the reconnaissance subunits of tank divisions and mechanized divisions and Coastal Defense units including the 7th Lusatian Landing Division (officially known as 7th Coast Defense Division). Poland also operated FROG-3 "Luna" tactical missile launch vehicles.[16]

PT-76s were in service with the Indian Army and they were in reserve status before they were withdrawn from service in 2009, after which they were used for target practice by the army and as static memorials at various military facilities.

Combat service

Vietnam War

Soviet PT-76s along with T-54s, T-55s, and Chinese Type 59s tanks formed the bulk of the People's Army of Vietnam (PAVN) armored forces.

The first successful action of PAVN armor in Vietnam was against the Lang Vei Special Forces camp on 6/7 February 1968[17] (they had already been used in the preceding Battle of Ban Houei Sane, which was just across the border in Laos however). Thirteen PT-76s, of the PAVN 202nd Armored Regiment spearheaded an assault against approximately 24 Green Berets, 500 South Vietnamese irregulars and 350 Laotian Royal soldiers. The defenders fought back with their 106 mm M40 recoilless rifle (one at the entrance took out three PT-76s until it was knocked out), and ineffectively with M72 LAWs (one-shot disposable 66 mm Light Anti-Tank Weapon). They requested support from nearby Khe Sanh Combat Base, which was unable to help, as it too was under siege. The Lang Vei camp was overrun, with the PT-76s using their turret-mounted spotlight-equipped heavy machine guns to shoot down any irregulars who panicked and ran out of the underground bunkers. A few survivors broke out and were airlifted to safety.

The first tank-to-tank engagement occurred in mid-1968 when a US reconnaissance airplane observed a PT-76 being washed by its crew in the Bến Hải River in the DMZ (17th Parallel). The Forward Air Control pilot radioed the tank's position to a nearby M48 Patton tank unit of the US 3rd Tank Battalion. With the FAC adjusting fire, the M48 fired three 90 mm rounds; obtaining a hit with the third round. The tank crew abandoned their vehicle. Shortly afterwards, some returning F-4 Phantom jet fighter bombers, with ordnance to expend, observed the PT-76 and bombed the remainder of the vehicle.

Battle of Ben Het

The Battle of Ben Het was the only PAVN–US Army tank battle during the course of the Vietnam War. 10 PT-76s faced 3 M48s.[18] On March 3, 1969, the Special Forces' Ben Het Camp was attacked by the PAVN 202nd Armored Regiment. The 202nd was given the task of destroying the camp's 175 mm self-propelled guns.[19] One of the PT-76s had detonated a land mine, which not only alerted the camp, but also lit up the other PT-76s attacking the firebase. Flares had been sent up, thus exposing adversary tanks, but sighting in on muzzle flashes, one PT-76 scored a direct hit on the turret of a M48, killing two crewmen and wounding two more. A second M48, using the same technique, destroyed a PT-76 with their second shot. At daybreak, the battlefield revealed the wreckage of two PT-76s and one BTR-50 armored personnel carrier.

First combat use of the TOW missile

The PT-76 was involved in a landmark incident in armored warfare, in being the first victim of the BGM-71 TOW anti-tank missile.[20]

On April 24, 1972, the US special experimental 1st Combat Aerial TOW Team arrived in South Vietnam. It consisted of two UH-1B helicopters mounting the new BGM-71 TOW and technicians from Bell Helicopters and Hughes Aircraft Corporation. It deployed in the Central Highlands, where it commenced gunnery training. From May 2, the team made daily flights in search of enemy armor, with the missiles mounted in the XM26 three-tube launcher. On May 9, PAVN armored units attacked Ben Het Camp; the TOW team destroyed 3 PT-76s and broke up the attack.[21]

On May 26, the PAVN made another attempt to retake the city of Kontum. TOW aircraft were brought in at first light and found PAVN tanks moving almost at will through portions of the city. Conventional air strikes would have been risky for friendly forces, and the TOW proved to be ideal for picking off enemy tanks.[22] At the end of the first day, the two TOW helicopters had destroyed 9 tanks and damaged one more. Four destroyed and one damaged were PT-76s.[23] [24]

Indian Service

See also: Battle of Garibpur. The PT-76 saw action with Indian forces in the Indo-Pakistani War of 1965 and 1971. The tactics of the Indian Army enabled the PT-76 to play a vital role in the Eastern theater of the 1971 war where the PT-76s proved superior to the obsolete Pakistani M24 Chaffee light tanks despite being outnumbered. A good example of such an engagement was the Battle of Garibpur, where an Indian Army Infantry Battalion with only 14 PT-76s was able to maul a much larger brigade-strength unit of Pakistani armor and inflict heavy casualties.[25]

During the battle 8 Pakistani M24 Chaffee tanks were destroyed, 3 captured at the cost of 2 PT-76.[26]

Other combat

The PT-76 also saw service in the Six-Day War (1967) during which the Israeli army destroyed or captured a few PT-76 tanks. During the Yom Kippur War in 1973 PT-76s were used during the crossing of the Great Bitter Lake by the Egyptian 130th Marines Brigade.[27] [28]

The People's Armed Forces of Liberation of Angola (FAPLA) deployed PT-76s during the Angolan Civil War, as did Cuba during its lengthy military intervention in that country. One FAPLA PT-76 was destroyed by a South African Ratel-90 armoured car during Operation Moduler.[29] At least six others were captured by South African expeditionary forces over the course of that conflict.[30]

During the Yugoslav wars, the PT-76 served with the Yugoslav People's Army and later the army of the Krajina Serbs in a few battles during the Ten-Day War in Slovenia (1991) and Croatian War of Independence (1991–1995).

The Indonesian Marine Corps used its PT-76Bs on the Indonesian island of Ambon during Maluku sectarian conflict in 1999-2003, and also in mid 1970s during Operation Lotus (Operasi Seroja).[31] [32]

List of conflicts

Variants

Soviet Union

Belarus

People's Republic of China

Czechoslovakia

East Germany

Indonesia

Israel

North Korea

Poland

Russian Federation

United States

Vietnam

Operators

Current operators

Former operators

Evaluation-only operators

See also

References

External links

Notes and References

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  3. Baryatynski, pp.13–15
  4. News: U.S. Experts Study 15-Ton Soviet Tank . 16 August 2018 . The New York Times . Associated Press . 5 December 1964 . https://web.archive.org/web/20180816131642/https://www.nytimes.com/1964/12/05/archives/us-experts-study-15ton-soviet-tank.html . 16 August 2018 . live .
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  31. Haryadi 2019, p. 383
  32. Haryadi 2019, p. 421
  33. Haryadi 2019, p. 421
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