BMD-4

The BMD-4 (Russian: "Боевая Машина Десанта-4"; Boyevaya Mashina Desanta-4 literally "Combat Vehicle of the Airborne") is an amphibious infantry fighting vehicle (IFV) originating from post-Cold War Russia. Originally designated as the BMD-3M, the chassis of the BMD-4 is the same as that of the BMD-3 due to the former being developed on the basis of the latter. This armored fighting vehicle is one of the lightest and one of the most heavily armed in its class possessing a substantial amount of firepower in comparison to its counterparts. The vehicle was designed to transport Russian Airborne Troops (VDV); increasing its mobility, armament, and protection on the battlefield.

Many components of the vehicle, such as the ergonomics and positioning of the passengers, remain relatively unchanged. Primary differences between the BMD-4 and its predecessors lie in its armament. The vehicle is fitted with the Bakhcha-U turret which consists of: a 100 mm 2A70 low-pressure rifled gun, a 30 mm 2A72 coaxial autocannon, and a 7.62 mm PKT coaxial machine gun. The 2A70 rifled cannon is capable of firing high explosive fragmentation rounds and laser guided anti-tank missiles. It also features secondary weapons designed to engage and destroy enemy infantry and armored fighting vehicles. The automated fire control system of the vehicle is advanced with new features that simplify the use of the vehicle's armament by the gunner and commander.

The vehicle is designed by the Volgograd tractor factory and the armament was developed by the KBP Instrument Design Bureau unitary enterprise located in Tula. Kurganmashzavod is the official manufacturer of the vehicle. The only operator of the BMD-4 is Russia where it entered service in late 2004 and has been produced ever since then. In 2008, a modernized version, designated as the BMD-4M, was introduced with significant contributions from Kurganmashzavod; the designer of the BMP. The VDV planned to receive 10 BMD-4M vehicles and 10 BTR-MD vehicles for final testing by mid-2013. Commissioning occurred during the end of 2013 with the VDV planning to acquire 1,000 BMD-4Ms by 2020.

Production
The BMD-4 was adopted by the Russian Armed Forces on December 31, 2004. In August 2005, the 106th Guards Airborne Division received the first batch of these vehicles with a total of 60 vehicles being created. In 2010, all further purchases of the BMD-4 with the "Bakhcha-U" turret were cancelled along with the 2S25. It was later noted by Colonel Gennady Anashkin that the BMD-4 will still enter service due to the vehicle being a completely new generation essential for the VDV. VDV commander Vladimir Shamanov told in an interview that the original BMD-4 possessed an unreliable base while the modernized BMD-4M is more than satisfying for the Russian airborne troops.

On March 21, 2008, Kurganmashzavod unveiled a modernized variant of the vehicle and was designated as the BMD-4M. The primary cause of the alterations was due to the bankruptcy of the original manufacturer being the Volgograd tractor factory. In 2008 it is planned to carry out comprehensive testing modernized BMD-4 program agreed with the Chief Armor Management (Bolshoi) of the Ministry of Defense and the VDV. According to test results and Mikhail Bolotin, the president of Concern Tractor Plants (KTZ), mass production was initially planned for the following year. The mass production of the modernized BMD-4 was later postponed along with the 2S25 Sprut-SD. Nikolay Makarov, the Chief of the General Staff of Russian Armed Forces, dismissed the BMD-4 as "a version of the BMP-3" with no protection and costs more than an expensive tank.

In August 2012, Alexander Sukhorukov, who was then deputy Defense Minister, said that the armored vehicle BMD-4M does not meet the requirements put forward by the Russian military department, and will not be purchased. At the same time a week before, Vladimir Shamanov said the BMD-4M is fully compliant with the VDV, which was more important in this regard than the requirements of the Ministry of Defence. He stressed that the fate of the BMD-4M is decided by the supreme commander Vladimir Putin. The Russian Army received another prototype batch of the modernised BMD-4M airborne assault vehicle during mid-2014. Eight modernized BMD-4M vehicles were delivered to the 106th Guards Airborne Assault Division by Kurganmashzavod, where the vehicles continue to undergo testing.

Hull
The hull of the BMD-4 bears a strong resemblance to the hull of the BMD-3 but with a number of innovations. The BMD-4 has a crew of three consisting of: a vehicle commander, a gunner, and a driver. It can carry up to five passengers and is more spacious than the original BMD-1 and BMD-2. The suspension is composed of six small road wheels and four track rollers on each side. Transmission of the vehicle is automatic with five gears for forward and five gears for backwards.

Primary
Both primary armaments of the BMD-4 are all fitted into one turret known as the Bakhcha U (Russian: Бахча-У; "Melon field") consisting of: a 100 mm 2A70 rifled gun, a coaxial 30 mm 2A72 autocannon, and a coaxial 7.62 mm PKT machine gun. This module is designed by the KBP Instrument Design Bureau for motorized infantry units without the support of tanks and artillery. The Bakhcha-U turret is installable on the chassis of other military vehicles such as the BMP-2, BMP-3, and BTR-90. This turret has an unlimited traversal of 360° and a maximum elevation of 60°; the maximum depression is −6°. The majority of armored and unarmored targets can be engaged by at least two types of armament provided by the Bakhcha-U turret.

The 2A70 rifled gun is capable of firing guided and unguided shells. 34 ready-to-use unguided HE-Frag shells are carried in the turret of the vehicle. The 100 mm gun is fitted with an autoloader that fires at a rate of 10-12 rounds per minute, with the time of each shell loading being 5–6 seconds. The two variants of HE-Frag shells available for the Bakhcha-U are the 3UOF17 and 3UOF19; the former having a muzzle velocity of 250 m/s with the latter achieving 355 m/s. The 3UOF19 also provides a substantially larger proximity detonation which increases the lethal radius of the explosion. When implemented in the Bakhcha-U turret, the 2A70 is capable of effectively hitting targets up to 7 km with its unguided rounds.

A 30 mm 2A72 autocannon is mounted coaxially with the 2A70 rifled gun. The turret of the BMD-4 contains a total of 500 rounds ready to be used by its autocannon with 245 of them being high explosive and the remaining being armor-piercing discarding sabot. This autocannon fires projectiles with a muzzle velocity of 1120 m/s and a cyclic rate of fire of 350–400 rds/min. The rounds fired can penetrate 22 mm of Rolled homogeneous armor (RHA) from a range of 2000 m while impacting at an angle of 60°. Minimum gas contamination of the turret is achieved by a delayed unlocking due to single-barrel long recoil action and forward case ejection. The 7.62 mm PKT machine gun is mounted coaxially with 100 mm and 30 mm weapons. 2000 rounds are carried in the turret for the PKT machine gun; all combined into one tape to eliminate reloading.

The 100 mm tank gun is also capable of firing the 9M117M1 Arkan anti-tank guided missile (ATGM) which is a further development of the 9M117 Bastion (NATO reporting name: AT-10 Stabber). With a weight of 21.5 kg, this ATGM has a penetration value of 750–800 mm of RHA behind explosive reactive armor (ERA). The turret holds four 9M117M1 missiles and is launched through the 100 mm gun ensuring a crucial advantage due to the loading being completely internal rather than external unlike other infantry fighting vehicles. While traveling at an average speed of 300 m/s, the Arkan is guided via laser beam riding and is capable of destroying targets up to 5.5 km away. This method of guidance allows it to be stealthy and insusceptible to countermeasures.

Secondary
As one of the most heavily armed IFVs, the BMD-4 possesses multiple secondary armaments. These secondary weapons include a 30 mm AGS-30 grenade launcher, a 5.45 mm RPK machine gun, and a 9P135M launcher post capable of firing additional anti tank missiles. The AGS-30 and RPK are both operated by passengers seated towards the front and bow mounted towards the left and right respectively. Both of these bow mounted weapons are dismountable and man portable for increased versatility. The 9P135M missile launcher is mounted towards the roof and is also dismountable.

The automatic AGS-30 grenade launcher fires at a rate of 400 rds/min with an effective range of 1700–2100 m depending on the sight equipped. The GPD-30 round that is used is designed to engage exposed and covered manpower and lightly armored combat vehicles. The round features the instant-action leading fuse that ensures a reliable detonation of the grenade when hitting various "soft" obstacles including snow and water. The RPK-74 is bow mounted towards the right side of the vehicle. It has a maximum range of 800 m and fires 5.45x39mm rounds which are also used by the standard AK-74 assault rifles in service with the Russian armed forces.

Additional ATGMs can be operated by the BMD-4. This is made possible by the 9P135M launcher post that fires the wire guided Fagot (NATO reporting name: AT-4 Spigot) and Konkurs (NATO reporting name: AT-5 Spandrel) missiles. The Fagot missile is a short range ATGM with an effective range of 2 km. While flying at an average speed of 186 m/s, it penetrates 480 mm of RHA. The Fagot-M is an improved variant that has an increased effective range of 2.5 km and a penetration of 550 mm of RHA. The Konkurs missile has an effective range of 4000 m and flies at an average speed of 206 m/s. The original Konkurs missile penetrates 750–800 mm of RHA while the improved Konkurs-M penetrates 750–800 mm of RHA after ERA due to an additional tandem warhead. The firing range is reduced to 2500 m during night time.

Protection
The weight of the BMD-4 is achieved by using aluminum alloy for the hull instead of steel as armor. This armor protects the BMD-4 from 30 mm weapons like its own 2A72 autocannon towards the front, and small arms fire and shell splinters towards the side. To counter infrared guidance and weapons, six 81 mm ZD6 smoke grenade dischargers in two banks of three are mounted towards the sides of the turret. An NBC protection system and automatic fire suppression systems are provided to the entire crew and passengers to ensure survivability in an environment with nuclear fallout.

Fire control system and sensors
The BMD-4 features an advanced fire control system (FCS). The unique armament system provided by the Bakhcha-U and the reliable ride performance provided by the chassis gives the BMD-4 qualitatively new capabilities to units of land forces. The BMD-4 is able to fire all its primary armaments effectively regardless of whether the vehicle is stationary or mobile, whether the time is day or night, or whether it is afloat or land based. The FCS implements a significant increase of the armament effectiveness by engaging a wide scope of targets in complicated weather and landscape conditions. Advanced ballistic calculations allow the BMD-4 to fire from an enclosed position and the capability of effectively firing at low and slow aerial targets is provided.

The computerized FCS of the BMD-4 is automated by day and night and features two advanced optical sights for both the commander and gunner. The IFV commander's panoramic sight has an azimuth coverage of 360° to search for targets. This panoramic sight features thermal imaging and range finding channels with a range of up to 10 km. The gunner's sight provides for firing all types of armament by day and night with a range finding sight of 10 km. This sight is combined with visual imaging, thermal imaging, range-finding channels, and a missile guidance channel. With two dedicated sights for both operators of the Bakhcha-U, the BMD-4 has hunter-killer capabilities and the gunner is able to use the commander's sight to engage targets if his own sight is disabled or destroyed. The commander of the vehicle also has the ability to override the command and to take control of the turret and gun from the gunner with both turret operators having complete control of the armaments.

Mobility
Like its predecessor, the BMD-4 is capable of parachuting from aircraft with the entire crew and passengers inside the vehicle which allows target engagement after landing to be instant. An Il-76 is able to transport two of these vehicles at a time in comparison to three BMD-1s and BMD-2s. Its engine is the 2V-06-2; the same as the BMD-3. This engine develops a total power of 450 horsepower (hp). The BMD-4 is also fully amphibious with two water jets mounted on each side of the back of the hull and can swim at speeds of up to 10 km/h in a Beaufort scale of 2. With a high power-to-weight ratio, the BMD-4 features superior acceleration in comparison to other infantry fighting vehicles. The maximum speed on a highway is 70 km/h and the BMD-4 can maneuver on a 60° gradient and a 35° side slope. The BMD-4 can cross 1.8 m trenches and climb 0.8 m tall obstacles. This vehicle's suspension is hydropneumatic and giving an adjustable ground clearing of 130–530 mm with the normal road clearance being 450 mm. The clearance is changed by the driver and can be changed within 10 seconds.

Variants

 * BMD-4K – The commander variant featuring an additional radio station
 * BMD-4M – A variant with a nodular unification with the BMP-3
 * Unnamed tank destroyer – A new order of 125 mm tracked self-propelled guns were made in 2013. These tank destroyers are planned to be made using the chassis of the BMD-4 with the turret being replaced by the 2A46M-5 125 mm gun; the same smoothbore gun used on the T-90.

BMD-4M
The BMD-4M was unveiled by Kurganmashzavod in 2008. This vehicle retains the Bakhcha-U turret with a number of other innovations. Overall crew protection is ensured. Special lightweight and durable alloys make this possible without the vehicle losing its ability to swim or be airdropped. The more powerful and compact engine of the BMP-3 is integrated into the BMD-4M; providing 500 hp. In general, the unification of units, plants, and systems of the modernized BMD-4 chassis with the same units, plants and systems of BMP-3 is 80%. This decreases the expenses of the airborne assault vehicle servicing in the army allowing a significant reduction of service maintenance of airborne combat vehicles in the army.

Operators

 * Russian airborne troops – 60 vehicles were in service during 2012. In 2013, 10 BMD-4M vehicles were ordered for 608 million rubles, with the VDV planning to receive 1,000 BMD-4Ms by 2020.
 * Russian airborne troops – 60 vehicles were in service during 2012. In 2013, 10 BMD-4M vehicles were ordered for 608 million rubles, with the VDV planning to receive 1,000 BMD-4Ms by 2020.

Potential operators

 * Indonesian Navy – 54 BMD-4s on order with delivery due to commence gradually in 2015.
 * Indonesian Navy – 54 BMD-4s on order with delivery due to commence gradually in 2015.