T-84


The T-84 is a Ukrainian main battle tank, a development of the Soviet T-80 main battle tank introduced in 1976. The T-84 was first built in 1994 and entered service in the Ukrainian Armed Forces in 1999. The T-84 is based on the diesel-engined T-80 version, the T-80UD. Its high-performance opposed-piston engine makes it one of the fastest MBTs in the world, with a power-to-weight ratio of about 26 horsepower per tonne. The T-84 Oplot is an advanced version incorporating an armoured ammunition compartment in a new turret bustle; ten of these entered Ukrainian service in 2001. The T-84-120 Yatagan is a prototype model intended for export, mounting a 120 mm gun capable of firing standard NATO ammunition and guided missiles.

Production history

The T-84 is the latest Ukrainian development of the T-80 series, designed by KMDB in Kharkiv. A main design objective was to make Ukraine's arms industry independent of Russia's, after resulting difficulties in fulfilling a contract to supply T-80UD tanks to Pakistan. An external difference from earlier models is the new Ukrainian welded turret, replacing the T-80's Russian-built cast turret.
The T-84's outstanding feature is the 26 hp/t power-to-weight ratio. The tank is also designed to perform well in hot climates, and even includes an air-conditioned crew compartment.
Due to the collapse of Soviet Union, the Malyshev Factory was no longer able to obtain ceramic armour modules from Russia and only the initial batch of T-84 were produced with such. Instead, later batches of T-84's composite armour is composed of special purpose rubber sandwiched between steel and alloy plates. The exact difference in performance between the new and previous armor is not known and depends on performance of dynamic armor.
Ukraine has demonstrated several upgraded prototypes of this tank, intended for both domestic employment and international sale.

Design

The BM Oplot is a further development of the previous Oplot, which is based on the T-84 main battle tank. The tank has a conventional layout with the driver's compartment at the front, fighting compartment in the middle and engine at the rear, accommodating a crew of three members.
The driver sitting in the centre is provided with a single-piece hatch cover that opens to the right. The commander on the right and the gunner on the left have single-piece hatches.
Tank has a length of 9.7 m, a width of 3.4 m without removable side skirts, and a height of 2.8 m. The combat weight of the tank is 51 tons.

Armament

The Oplot MBT is armed with a 125 mm smoothbore KBA-3 cannon, a KT-7.62 Coaxial machine gun and a KT-12.7 anti-aircraft machine gun. The main gun is fed by a loading system equipped with conveyor, automatic loader and control system. The ammunition includes high explosive fragmentation, armour-piercing fin-stabilised discarding-sabot, high explosive anti tank and gun mount rounds.
The main gun can also fire a laser guided missile against battle tanks, armoured vehicles and hovering helicopters within the range of 5,000m. The missile can be fired on the move against travelling targets. The tandem warhead fitted on the missile can defeat targets equipped with explosive reactive armour and advanced spaced armour.
The Oplot has 46 rounds of ammunition for the main gun, of which 28 rounds are placed in the automatic loader. Other ammunition types carried are 1,250 rounds for KT-7.62 machine gun, 450 rounds for KT-12.7 machine gun and 450 rounds for AKS submachine gun.

Fire control

The vehicle has three forward-facing periscopes in front of the driver's cupola. The centre periscope can be replaced with a night driving device.
The fire control system includes a gunner's day sight, PNK-6 commander's panoramic sighting system, PTT-2 thermal imaging sight, anti-aircraft sight and anti-aircraft machine gun control system. Detection range of targets for thermal sighting system is up to 8 km.
The tank is also equipped with LIO-V ballistic computer, armament stabiliser and other systems.
The advanced fire-control system enables the gunner or commander to lay and fire the main armament on the move. The stationary and moving targets can be hit with a high first round hit probability.

Protection

The protection system includes multilayer passive armour, Duplet explosive reactive armour, Zaslon active protection system, Varta optronic countermeasures system and other tank protection means.
Built-in new generation Duplet anti-tandem-warhead explosive reactive armour protects against APFSDS, or high-explosive plastic and HEAT-type projectiles.
Duplet ensures protection against:
Both sides of the driver's compartment are fitted with explosive reactive armour panels for extended protection. The hull sides are hinged with large rubber skirts to withstand the attacks of man-portable anti-tank weapons. The modular explosive reactive armour package can be easily replaced or upgraded according to the future requirements.
Oplot features a Varta optronic countermeasures system for deceiving incoming missiles and anti-tank guided weapons. The system integrates laser warning sensors, infra-red jammer and smoke / aerosol screen laying system. The optronic countermeasure system provides:
Crew's collective protection system ensures protection of the crew and interior equipment against effects of nuclear explosions, radioactive substances, toxic agents and biological warfare agents, as well as detection and suppression of fires in the crew compartment and power pack compartment.
The Oplot tank can withstand an explosion of up to 10 kg trinitrotoluene under the tank track and up to 4 kg TNT under the driver's compartment.
The vehicle has overpressure-type NBC protection system and can be fitted with track mine-clearing systems.

Engine and mobility

BM Oplot is powered by a :es:6TD-2|6TD-2E 6-cylinder turbocharged liquid-cooled engine, which delivers. It is improved and more environmentally friendly version of the previous :uk:6TD|6TD-2 diesel engine, used on the T-84 MBT. The tank could also be powered by a more powerful :uk:6TD|6TD-3 diesel, developing 1,500 hp. Both engines could use diesel, jet engine fuel, petrol or any mixtures of them.
The engine provides a maximum on-road speed of and a range of with additional fuel tanks. The battle tank is also equipped with a diesel-electric auxiliary power unit to supply power to onboard systems when the main engine is turned off.
BM Oplot is equipped with torsion bar type suspension. Either side of the six dual rubber-tyred road wheels are provided with idler at forward, drive sprocket at the rear, and track support rollers.
The first, second and sixth road wheel stations are fitted with hydraulic shock absorbers. The tank can negotiate a gradient of 32° and side slope of 25°. Equally, the tank can ford a water depth of 5m using deep water fording equipment.

Variants

;T-84
;T-84U
;T-84 Oplot
;T-84-120 Yatagan
;T-84 Oplot-M
;T-84 Oplot-T
;BREM-84 ''Atlet
;BREM-T
;BMU-84
;BTMP-84

Service history

Ukraine

The first T-84 prototype vehicle rolled out in 1994, and in the same year it was decided to build several more vehicles. They were subjected to extensive company and army trials. After successful completion of the extensive trials programme in the late 1990s the T-84 MBT entered service with the Ukrainian Army in 1999.

Thailand

In September 2011, the Malyshev Plant announced plans to produce the first batch of five Oplot-M tanks for the Thai Army by the end of the year. Under the contract, the Ukrainian company will make 49 tanks worth over US$200 million. As of November 2017, 31 tanks have been delivered.

Operators

Current operators

In March 2011, the Royal Thai Army placed an order for 49 T-84s to replace its fleet of aging M41A3 Walker Bulldog light tanks. The government has approved 7.155 billion baht to purchase the first 49 Oplot tanks to be assigned to several units: the 2nd Cavalry battalion, the 4th Cavalry battalion, the 8th Cavalry battalion, and the 9th Cavalry battalion. In April 2017, it was reported that following the delayed deliveries from this tank, the Royal Thai Army was expected to decline the remainder of the sale and acquired the Chinese VT-4 main battle tank instead of the Ukrainian tank, due to the long term delivery schedule. The signed order for 49 units has to be completed by the month of January, 2017, it was reported that other deliveries may not be expected. A 26 March 2018 press release by Ukroboronprom stated that the 2011 contract for supplying Oplot-T tanks to Thailand had successfully completed and that the last party of tanks had passed checks by the customers and would be sent to the buyer in the near future. According to The Military Balance 2019, Thailand had acquired 49 T-84 Oplot main battle tanks.

Evaluation-only operators

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