Leopard 2 Main Battle Tank


The Leopard 2 is a main battle tank developed by Krauss-Maffei in the early 1970s for the West German Army. The tank first entered service in 1979 and succeeded the earlier Leopard 1 as the main battle tank of the German Army. Various versions have served in the armed forces of Germany and twelve other European countries, as well as several non-European nations. More than 3,480 Leopard 2s have been manufactured.
The Leopard 2 first saw combat in Kosovo with the German Army and has also seen action in Afghanistan with the Danish and Canadian contributions to the International Security Assistance Force.
There are two main development batches of the tank, the original models up toLeopard 2A4, which have vertically-faced turret armour, and the "improved" batch, namely the Leopard 2A5 and newer versions, which have angled arrow-shaped turret appliqué armour together with a number of other improvements. All models feature digital fire control systems with laser rangefinders, a fully stabilized main gun and coaxial machine gun, and advanced night vision and sighting equipment (first vehicles used a low-light level TV system or LLLTV;thermal imaging was introduced later on). The tank has the ability to engage moving targets while moving over rough terrain.
Even as the Leopard 1 was entering service in 1965, an up-gunned version with the new Rheinmetall L44 120 mm gun was being considered to keep pace with newer Soviet designs, but this was cancelled in favour of the MBT-70 "super-tank" project developed jointly with the United States. The MBT-70 was a revolutionary design, but after large cost overruns, Germany withdrew from the project in 1969.
Work on a national development was started in 1970 by Krauss-Maffei. A year later, a choice was made for it to be based on the earlierExperimentalentwicklung (later named Keiler) project of the late sixties (itself derived from the vergoldeter Leopard or "gilded Leopard"), instead of being a modified MBT-70 or Eber. The name of the design was determined in 1971 as "Leopard 2" with the original Leopard retroactively becoming the Leopard 1. Seventeen prototypes were ordered that year (only sixteen hulls were built). They had to have a maximum weight of fifty metric tons.
On 11 December 1974 a Memorandum of Understanding was signed with the USA for the possible joint production of a new MBT, after the Americans had bought and investigated prototype hull number seven in 1973. In view of the experiences in the Yom Kippur War a much higher level of protection was demanded than was implemented in the prototypes, that used heavily sloped spaced armour. The weight class was increased to sixty tons. Prototype turret number fourteen was changed to test a new armour configuration, and was turned into a blockier looking turret as a result of using vertical steel perforated armour; it already had been much more voluminous than the turret of a Leopard 1 because of a large internal ammunition storage locker in the rear bustle. The Leopard 2 thus initially used perforated armour, and not Chobham armour as is sometimes claimed. PT-14 used the 120 mm Rheinmetall gun (as eventually did the U.S. Abrams). After this, two new prototype hulls and three turrets were ordered, one (PT-20) mounting the original L7A3 105 mm gun and a Hughesfire control system, a second (PT-19) with the same fire control system but able to "swap out" the gun for the 120 mm Rheinmetall design (it was indeed so changed by the Americans), and one more (PT-21) mounting the Hughes-Krupp Atlas Elektronik EMES 13 fire control system, with the 120 mm gun.
In mid-1976 prototype 19 was assembled and shipped to the USA, together with hull number twenty and a special target vehicle to test the armour. The prototype was called Leopard 2AV (Austere Version) because it had a simplified fire control system. It arrived in the US by the end of August 1976, and comparative tests between the Leopard 2 and the XM1 (the prototype name for the M1 Abrams) prototypes were held from 1 September at Aberdeen Proving Ground, lasting until December 1976. The US Army reported that the Leopard 2 and the XM1 were comparable in firepower and mobility, but the XM1 was superior in armour protection. Today we know this was true as regards a hit by a hollow charge; but against KE-attack the Leopard 2 was almost twice as well protected as the original M1 (650 mm to 350 mm). Its more traditional multi-fuel turbodiesel engine was also more reliable, and provided similar performance with less fuel consumption, with more noise but a smaller heat signature. This type of engine also allowed for quick engine startups and shutdowns to prevent the need for long idling periods on the battlefield. Hull twenty was fitted with simulation weights; later it was discovered that these equalled only the weight of a turret without armour modules fitted, invalidating all performance data. After the comparative test the Leopard 2 hulls were returned to Germany for further evaluation, but turret 19 remained and was fitted to the hull of prototype seven, whilst its gun was changed for the 120 mm Rheinmetall. In tests until March 1977 it was found to be far superior to the 105 mm L7 mounted on the Abrams, which was confirmed by subsequent NATO tank gunnery contests.
Before tests had begun the United States had selected the Chrysler XM1 prototype for full development. In January 1977 Germany ordered a small pre-series of three hulls and two turrets, delivered in 1978. These vehicles had increased armour protection on the front of the hull. In September 1977 1800 Leopard 2 were ordered, to be produced in five batches. The first was delivered on 25 October 1979. The Dutch army had already rejected the M1 because of its high operating costs and the refusal by the Americans to fit a Dutch version with the 120 mm gun and instead ordered 445 Leopard 2s on 2 March 1979. The Swiss ordered 35 tanks on 24 August 1983 and started license production of 345 additional vehicles in December 1987. Thus hardly being a major export success in the 1980s (no tank of the latest generation was), the type became very popular in the 1990s, when the shrinking German army offered many of its redundant Leopard 2s at a reduced price. It became successful enough in Europe that the manufacturer started calling it the Euro Leopard, despite France, Britain, and Italy all operating their own MBTs. But with further non-European orders, the name "Global-Leopard" is now used instead.
The Leopard 2 uses spaced, multi-layered composite armour throughout the design. The Leopard 2A5 and A6 models have additional armour added to the turret front, and on the hull and side skirts.[5] Estimated levels of protection for the Leopard 2 range from 590 - 690 RHAe on the turret, 600 RHAe on the glacis and lower front hull on the Leopard 2A4, to 920 - 940 RHAe on the turret, 620 RHAe on the glacis and lower front hull on the Leopard 2A6 against kinetic projectiles. The mine-protected Leopard 2A4M and 2A6M adds an additional mine protection plate for the belly, which increases protection against mines and improvised explosive devices. All Leopard 2 variants after the Leopard 2A6 include spall liners on the inside of the tank, protecting the crew. The Leopard 2A6M CAN increases protection against rocket-propelled grenades (RPGs) by including additional slat armour.
Two groups of 4 Wegmann 76 mm smoke mortars are mounted on either side of the turret and can be electrically fired either as single rounds or in salvos of four are mounted on most Leopard 2 models, with the exception of Dutch Leopard 2s, which are instead equipped with a Dutch-designed smoke mortar system with six barrels on each side.  Swedish Leopard 2s utilize French GALIX smoke dispensers, similar to the system found on the French Leclerc.
The crew is also protected against Nuclear, Biological and Chemical (NBC) threats, as the Leopard 2 is equipped with a NBC overpressurization system which provides up to 4 mbar (0.004 kp/cm2) over-pressure inside the vehicle.
The Leopard 2 is equipped with a fire protection system. Four 9 kg Halon fire extinguisher bottles are installed on the right behind the driver's station. The bottles are connected to pipes and hoses and are activated automatically by the fire detection system, when temperatures rise above 82°C (180 °F) inside the fighting compartment, or manually via a control panel in the driver's compartment. An extra 2.5 kg Halon fire extinguisher is also stored on the floor beneath the main gun.
The primary armament for production versions of the Leopard 2 is the Rheinmetall 120 mm smoothbore gun, in either the L44 variant (found on all production Leopard 2s until the A5), or the L55 variant (as found on the Leopard 2A6 and subsequent models). 27 rounds of the main gun ammunition are stored in a special magazine in the forward section of the hull, to the left of the driver's station, with an additional 15 rounds stored in the left side of the turret bustle, and separated from the fighting compartment by an electrically operated door. If the ammunition storage area is hit, a blow-off panel in the turret roof would direct an explosion upwards away from the crew compartment. The gun is fully stabilized, and can fire a variety of types of rounds, such as the German DM33 APFSDS-T anti-tank round, which is said to be able to penetrate 560 millimeters (22 in) of steel armour at a range of 2,000 metres (2,200 yd), and the German DM12 multipurpose anti-tank projectile (MPAT). For the L55 gun, a newer APFSDS-T round was introduced to take advantage of the longer barrel, the DM-53, which is said to be able to penetrate in excess of 810 mm of RHAe armour at a range of 2,000 meters. The bore evacuator and the gun's thermal sleeve of the A4 and A5, designed to regulate the temperature of the barrel, are fabricated out of glass-reinforced plastic. The barrel has a chrome lining to increase barrel life. The main gun is capable of power elevating from +20° to −9°.
Rheinmetall has developed an upgrade for Leopard 2 tanks to give them the ability to fire the LAHAT anti-tank guided missile through the main gun; the missile can engage targets out to a range of 6,000 metres (20,000 ft).
The Leopard 2 is equipped with two machine guns, one mounted co-axially, the other on an anti-aircraft mount. On German models, the two machine guns are the MG 3 7.62 mm machine gun; on Dutch and Singapore models, these two machine guns are FN MAG7.62 mm machine guns, and on Swiss models, they are Swiss MG 87 7.5 mm machine guns. 4750 rounds of machine gun ammunition are carried on board the Leopard 2.
The standard fire control system found on the Leopard 2 is the German EMES 15 fire control system with a dual magnification stabilized primary sight. The primary sight has an integrated Neodymium Yttrium Aluminium Garnet (Nd:YAG) solid state laser rangefinder and a 120 element cadmium mercury telluride, CdHgTe (also known as CMT) Zeiss thermal sight which are both linked to the tank's fire control computer. A backup 8x auxiliary telescope FERO-Z18 is mounted coaxially for the gunner. The commander has an independent periscope, the Rheinmetall/Zeiss PERI-R 17 A2. The PERI-R 17 A2 is a stabilised panoramic periscope sight designed for day / night observation and target identification, and it provides an all round view with a traverse of 360°. The thermal image from the commander's periscope is displayed on a monitor inside the tank. Initial production tanks were not equipped with a thermal sight, due to the sight being not ready, and instead temporarily substituted the PZB 200 low light TV system (LLLTV).
The fire control suite is capable of providing up to three range values in four seconds. The range data is transmitted to the fire control computer and is used to calculate the firing solution. Also, because the laser rangefinder is integrated into the gunner's primary sight, the gunner is able to read the digital range measurement directly. The maximum range of the laser rangefinder is just less than 10,000 m with a measuring accuracy to within 20 m at this range. The combined system allows the Leopard 2 to engage moving targets at ranges of up to 5,000 meters whilst itself being on the move over rough terrain.
The Leopard 2 is propelled by the MTU MB 873 diesel engine, which provides 1,500 PS(1,103 kW) of engine output. The MTU MB 873 diesel engine is a four-stroke, 47.6 litre, 12-cylinder multi-fuel, exhaust turbo-charged, liquid-cooled engine, which has an estimated fuel consumption rate of around 300 litres per 100 km on roads and 500 litres per 100 km across country, and is coupled to the Renk HSWL 354 gear and brake system. The Renk HSWL 354 transmission has 4 forward, 2 reverse gears with a torque converter and is completely automatic, with the driver selecting the range. The Leopard 2 has 4 fuel tanks, which have a total capacity of approximately 1,160 litres, giving a maximum road range of about 500 km. Together, the propulsion pack is capable of driving the Leopard 2 to a top road speed of 68 km/h (which is limited -by law, not technical- to 50 km/h during peacetime), and top reverse is 31 km/h. The power pack can be changed in the field in 35 minutes. The engine and transmission is separated from the crew compartment through a fireproof bulkhead. An enhanced version of the EuroPowerPack, with a 1,650 PS (1,214 kW) MTU MT883 engine has also been trialled by the Leopard 2.
The Leopard 2 has a torsion bar suspension, and has advanced friction dampers. The running gear consists of seven dual rubber-tyred road wheels and four return rollers per side, with the idler wheel at the front and drive sprocket at the rear. The tracks are Diehl 570F tracks, with rubber-bashed end connectors, which have removable rubber pads and use 82 links on each track. For use in icy ground, up to 18 rubber pads can be replaced by the same number of grousers, which are stored in the vehicle's bow when not in use. The upper part of the tracks are covered with side skirts, with the first two road wheels and idler covered by an armoured skirt.
The Leopard 2 can drive through water 4 meters (13 ft) deep using a snorkel or 1.2 meters (3 ft 11 in) without any preparation and climb vertical obstacles over one metre high.
The German Army has prioritized mobility in its Leopard 2 which is considered the fastest MBT in existence.



Leopard 2
The baseline Leopard 2, sometimes informally called the "A0" to differentiate it from later versions, was the first series manufactured version. The vehicles were manufactured from October 1979 until March 1982, altogether 380 vehicles. 209 were built by Krauss Maffei and 171 by MaK. The basic equipment consisted of electrical-hydraulic WNA-H22, a fire control computer, a laser rangefinder, a wind sensor, a general purpose telescope EMES 15, a panorama periscope PERI R17, the tower sight FERO Z18, on the tower roof as well as a computer controlled tank testing set RPP 1–8. 200 of the vehicles had a low-light enhancer (PZB 200) instead of a thermal imaging. Two chassis served as driver training vehicles.

Leopard 2A1
A number of minor modifications and the installation of the gunner's thermal sight was worked into the second batch of 450 vehicles Leopard 2 designated the A1; 248 by Krauss-Maffei (Chassis Nr. 10211 to 10458) and 202 by Mak (Chassis Nr. 20173 to 20347). Deliveries of the 2A1 models started in March 1982 and ended in November 1983. The two most notable changes were the modification of the ammunition racks to be identical to those in the M1 Abrams, and redesigned fuel filters that reduced refuelling time.
A third batch of 300 Leopard 2; 165 by Krauss-Maffei (Chassis Nr. 10459 to 10623) and 135 by MaK (Chassis Nr. 20375 to 20509.) 2A1's of the third batch were built between November 1983 and November 1984, which included more minor changes that were later retrofitted to the earlier 2A1's.

Leopard 2A2
This designation was given to upgraded vehicles of the first batch of Leopard 2s, brought up to the standard of the second and third batches. This modernisation gradually replaced the original PZB 200 sights in the first batch with thermal sights for the EMES 15 as they became available. Furthermore the upgrade included the fitting of filler openings and caps to the forward hull fuel tanks to allow separate refuelling, as well as the addition of a deflector plate for the periscope and a large coverplate to protect the existing NBC protection system. Finally, the tank was given new five metre towing cables with a different position. The programme began in 1984 and ended in 1987; the third, fourth and fifth batches were during this period produced with the same features. The modernised first batch can be recognised by the circular plate covering the hole where the cross-wind sensor for the fire-control system was removed.

Leopard 2A3
The fourth batch of 300 vehicles; 165 by Krauss-Maffei (Chassis Nr. 10624 to 10788) and 135 by Mak (Chassis Nr. 20510 to 20644) was delivered between December 1984 and December 1985. The main change was the addition of the SEM80/90 digital radio sets (also being fitted to the Leopard 1 at the same time), and the ammunition reloading hatches being welded shut. Even with these minor changes the new batch was known as the 2A3. According to Nowa Technika Wojskowa 2003 March issue, Germany staged a fire test with T-72 against Leopard 2A3s and early A4s, 3BM22 can not penetrated front as close as 500 m, and some Soviet APFSDS with TUNGSTEN rod can perforate it on less than 1 km

Leopard 2A4
The most widespread version of the Leopard 2 family, the2A4 models included more substantial changes, including an automated fire and explosion suppression system, an all-digital fire control system able to handle new ammunition types, and improved turret with flat titanium/tungsten armour.
The Leopard 2s were manufactured in eight batches between 1985 and 1992. All the older models were also upgraded to 2A4 standard. Until 1994 Germany operated a total of 2,125 2A4s (695 newly built and the rest modified older versions), while the Netherlands had an additional 445 tanks. The 2A4 was also license manufactured in Switzerland as the Panzer 87 "Leopard" or Pz 87. This version included Swiss-built 7.5 mm Mg 87 machine guns and communications equipment, and featured improved NBC protection system. Switzerland operated 380 Pz 87 tanks.
At the turn of the century, Germany and the Netherlands found themselves with large stocks of tanks they had no need for after the end of the Cold War. These tanks were sold to NATO or friendly armies around the world. Among these were Austria, who received 114 vehicles, Canada (107), Chile (140), Denmark (51), Finland (139), Greece (183), Norway (52), Poland (128), Portugal (37), Singapore (96) Spain (108), Sweden (160), and Turkey (339) were among the buyers of the surplus tanks.
The Pz 87WE (WertErhaltung) is planned a Swiss modification and upgrade of the Pz 87. The modification significantly improves protection through the addition of the Leopard 2A6M's mine protection kit, thicker armour on the front glacis, and a turret equipped with a Swiss-developed armour package using titanium alloy. The turret roof armour is improved and the smoke grenade launchers redesigned. Further improvements enhance survivability and combat capability, such as a turret electric drive similar to the Leopard 2A5, a driver rear-view camera, an independent weapons station for the loader, and enhanced command and control systems. The fire control system is also upgraded, using the Carl Zeiss Optronics GmbH PERI-R17A2 fire control system. A remote weapons station containing a fully stabilized Mg 64 0.50 calibre machine gun is also fitted to the tank.
The Pz 87-140 is an experimental variant of the Swiss Pz 87 with a 140 mm gun and an additional armour later used on the newer production variants.
The Leopard 2A4CHL is the upgraded Chilean version of the Leopard 2A4 ordered by Chile in 2007. Upgrades include new electronics, sighting and information systems meant to elevate the Leopard 2A4's networking capability to be equal to that of the Leopard 2A6, a new suspension system and the upgrading of the tanks main gun to the L55 smoothbore cannon used on the Leopard 2A6. Other upgrades are remote weapon stations over the gunner and commander hatches fitted with the MG3 and HK GMG. The Leopard 2A4CHL also has improved roof and side turret armour and can be uplinked with Chile's battlefield control network.
The Leopard 2A4M CAN is the upgraded Canadian version of the Leopard 2A4 acquired from the Royal Netherlands Army surplus. The Leopard 2A4M CAN is specially designed for thewar in Afghanistan, based on experience gained by Leopard 2 operators. The first 20 were delivered in October 2010 and with only 5 being deployed to Afghanistan at end of 2010, and operated until July 2011 when combat operations stopped. Though originally planned to be up-gunned to the L55 for consistency with the 2A6M CAN, the longer barreled guns (optimized for tank-vs-tank warfare) were found to be less than ideal in Afghanistan, therefore it was decided to retain the L44. In addition, only small areas of slat armour were added, in contrast with the fully caged 2A6M CANs. The protection of the Leopard 2A4M CAN has been further augmented with the addition of applique armour resembling that found on the most recent Leopard 2A7+ variant, but modified to fit the turret configuration of the 2A4. Of the remaining ex-Dutch Leopards, Canada will upgrade 42 for training use (though whether they will be fully upgraded to 2A4M CAN standards is uncertain) and convert 18 to Armoured Engineering Vehicles (13 firm and 5 options). Canada has also purchased 15 2A4s from Germany as Logistic Stock Vehicles (for spare parts), and in February 2011 bought 12 2A4s/Pz 87 from the Swiss to be converted to "support vehicles" (likely Armoured Recovery Vehicles).
The Leopard 2NG (Next Generation) is a privately funded Turkish upgrade by Aselsan that includes the application of more armour (AMAP), upgraded optics, completely overhauled turret mechanics and a new fire control system on the work since 1995 and to be delivered by late 2011 which is intended to be used on new Altay MBT. It was developed without an order of the Turkish Army, but might meet the requirements for the modernization of the Turkish Leopard 2A4s. The old powerpack and the L/44 gun barrel are kept, but the combat weight is increased to 65 tonnes. According to the Turkish news sources, Finland is interested in getting the Turkish upgrade package to modernize their fleet of Leopard 2A4s.

Leopard 2A5
The Leopard 2 A5 is an improved version of proven Leopard 2 with improved armor and survivability. The A5 model has specially located add-on armor to counter top-attack munitions and latest generation anti-tank missiles. A new commander's thermal sight has been provided in addition to the gunner's one.
The German Army ordered new-built Leopard 2 A5 tanks and Sweden also ordered the A5 model under the Strv122 designation and featuring some minor modifications.

Leopard 2A6
The Leopard 2 A6 is an improved Leopard 2 A5 through the addition of a L55 120mm smoothbore gun (55 calibers long). The new gun provides superior firepower enabling the Leopard 2 A6 to destroy tanks protected with improved heavy armor and to engage targets at longer ranges. The L55 gun will also be able to employ new ammunition and to penetrate heavier armors.
Germany and the Netherlands are upgrading their Leopards to the A6 configuration. Leopard 2 provided to Spain and Greece (Leopard 2 HEL) will be A6 or A6-based models.

Leopard 2A6M
The Leopard 2 A6M, also known as Leo 2 A6M or MBT 122M in Sweden, is an improved of Leopard 2 A6 Main Battle Tank featuring additional mine protection for Leopard 2 crew against anti-tank mines. The first Leo 2 A6Ms are scheduled for delivery to the German and Swedish armies in July 2004. The Leopard 2 tanks with additional mine protection will be provided from existing Leopard 2 and MBT 122, Leopard 2 Swedish designation, tanks.
On July 7, 2004, the first mine-protected Leopard A6M were handed over to German and Swedish Armies at Krauss-Maffei Wegmann (KMG) facilities in Munich, Germany. KMG will supply the retrofit kits to Swedish industry, while Germany's Leopard 2 tanks will be upgraded to the A6M standard locally by KMG. The retrofit kit includes add-on armor, new seat system and re-stowage arrangements.

Leopard 2 PSO
This new variant Leopard 2 PSO (Peace Support Operations) is designed specially for urban warfare, which had been encountered in peacekeeping operations with increasing frequency. Therefore the Leopard 2 PSO is equipped with more effective all-around protection, a secondary weapons station, improved reconnaissance ability, a bulldozer blade, a shorter gun barrel (for maneuvering on urban streets at the expense of fire range), non-lethal armament, close-range surveillance ability (through camera systems), a searchlight and further changes to improve its perseverance and mobility in a built-up non-wide open area, not too dissimilar to the Tank Urban Survival Kit for the American M1A2 Abrams.

Leopard 2A7+
The Leopard 2 A7+ is a further development of the successful Leopard 2 main battle tank incorporating a modular protection kit, increased mobility, improved sustainability, enhanced reconnaissance abilities and a more precise fire control system. As of mid-2010, it had successfully been tested and qualified by the German Army. The Leopard 2 A7+ modular design allows operations in urban terrain as well as high intensity operations. The same modular design also provides unmatched Improvised Explosive Device (IED) and mine protection. An urban operations kit offers a 360-degree protection against Rocket Propelled Grenades (RPG) while a duel-kit protects the crew from Kinetic Energy (KE) and Shaped Charge (SC) projectiles especially on the frontal arc in classical duel-situations.
The Leopard's main gun can fire a 120mm High Explosive (HE) round that enables the crew to engage targets behind cover and within buildings. Besides, the FLW 200 remote weapon station is operated under protection avoiding exposing the tank's commander and gunner to hostile fire in urban terrain operations. The Leopard 2 A7+ also features a new final drive, new track, enhanced torsion bars and improved brake system and an adaptable dozer blade to clear obstacles. A new high performance cooling unit and an Auxiliary Power Unit (APU) allows to accomplish continuous operations for 24-hour. The tank's situational awareness has been enhanced thanks to the third generation ATTICA thermal sight for the commander and gunner and day/night cameras for the driver.

Leopard 2-140
As the 1990s began, Rheinmetall began developing a 140 mm smoothbore cannon as a future tank cannon. This was intended to counter new developments in Soviet-bloc armoured fighting vehicles, most especially persistent rumours that the next-generation Sovietmain battle tank would be armed with either a 135 mm or 152 mm cannon. This program was contemplated as the third stage in the KWS program of modernizing Leopard 2 tanks. KWS I was the replacement of the L44 120 mm cannon with the 55-calibre model, KWS II was a modernization program that became the Leopard 2A5, and KWS III was the development of a new turret including a 140 mm smoothbore weapon system and an automatic loader, which would have resulted in the reduction of the crew size to 3 soldiers. The final project design contained a lateral loading mechanism and had the main gun moved in the left turret side. Ammunition load for the main gun was 32 rounds, which were stored in a large ammunition bunker, covering the full turret rear. Moving the ammunition out of the crew's compartment would have resulted in a higher survivability in case of a penetration. The planned protection level was to be equal to the Leopard 2A5 or better. Command and control of the tank was supposed to be improved by the introduction of the ISIS system in its latest version. The KWS III was not adopted then, but development continued on the 140 mm weapon system, with Rheinmetall coordinating with Royal Ordnance from the UK and GIAT from France. To test out the weapon's capabilities, the 140 mm gun was mounted to a Leopard 2. The tank was not equipped with the new turret armour of the KWS III improvement program, nor with an automatic loader, and it also still had the electro-hydraulic turret drive. To cope with the extra weight of the main gun, counterweights were added to the turret rear. The tests were partially successful, with the gun showing superior penetration power, but also some difficulties with the handling.
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