4 of best tanki in the world

M1 Abrams armament
The main armament is the 120mm M256 smoothbore gun, developed by Rheinmetall Waffe Munition GmbH of Germany. The 120mm gun fires the following ammunition: the M865 TPCSDS-T and M831 TP-T training rounds, the M8300 HEAT-MP-T and the M829 APFSDS-T which includes a depleted uranium penetrator. Textron Systems provides the Cadillac Gage gun turret drive stabilisation system.
The commander has a 12.7mm Browning M2 machine gun and the loader has a 7.62mm M240 machine gun. A 7.62mm M240 machine gun is also mounted coaxially on the right hand side of the main armament.

FV4034 Challenger 2 is a main battle tank (MBT) currently in service with the armies of the United Kingdom and Oman. It is built by the British company Vickers Defence Systems (now part of BAE Systems Land and Armaments). The manufacturer advertises it as the world's most reliable main battle tank[2] As of January 2008, two Challenger 2s have been damaged in combat, and one destroyed by another Challenger 2 in a friendly fire incident.
Challenger 2 is an extensive redesign from Challenger 1, the MBT from which it was developed. It uses the basic hull and automotive parts of its predecessor but all else is new. Less than 5% of components are interchangeable. Challenger 2 has now replaced Challenger 1 in service with the British Army and is also used by the Royal Army of Oman. It has seen operational service in Bosnia, Kosovo and Iraq (2003–present). During the 2003 invasion of Iraq the Challenger 2 was the only tank operating in the Gulf that did not suffer a loss to enemy fire. In one engagement a Challenger took multiple hits from rocket propelled grenades and from one MILAN anti tank missile.[

history

Challenger 2 is the third vehicle of this name, the first being the A30 Challenger, a Second World War design using the Cromwell tank chassis with a 17 pdr gun. The second was the Persian Gulf War era Challenger 1, which was the British army's main battle tank (MBT) from the early 1980s to the mid-1990s.
Vickers Defence Systems (later Alvis Vickers, now BAE Systems Land Systems) began to develop a successor to Challenger 1 as a private venture in 1986. Following the issue of a Staff Requirement for a next-generation tank, Vickers formally submitted its plans for Challenger 2 to the Ministry of Defence (MoD). They were awarded a £90 million contract for a demonstrator vehicle in December 1988. In June 1991, after competition from other tank manufacturers designs (including the M1A2 Abrams, the Leopard 2 (Improved) and the Leclerc), the MoD placed a £520 million order for 127 MBTs and 13 driver training vehicles. An order for a further 259 tanks and 9 driver trainers (worth £800 million) was placed in 1994. Oman ordered 18 Challenger 2s in 1993 and a further 20 tanks in November 1997.
Production began in 1993 at two primary sites: Elswick, Tyne and Wear and Barnbow, Leeds, although over 250 subcontractors were involved. The first tanks were delivered in July 1994.
Challenger 2 successfully completed its Reliability Growth Trial in 1994. Three vehicles were tested for 285 simulated battlefield days. Each day is known to have consisted of:
27 km of On-road Travel
33 km of Off-road Travel
34 Main Armament Rounds fired
1,000 7.62 MG rounds fired
16 h Weapon System Operation
10 h Main Engine Idling
3.5 h Main Engine Running
An equally important milestone was the In-Service Reliability Demonstration (ISRD) in 1999. 12 fully crewed tanks were tested at the Bovington test tracks and at Lulworth Bindon ranges. The tank exceeded all staff requirements.
Challenger 2 entered service with the British Army in 1998 (with the Royal Scots Dragoon Guards in Germany), with the last delivered in 2002. It is expected to remain in service until 2035. It serves with the Royal Scots Dragoon Guards, the Royal Dragoon Guards, the Queen's Royal Hussars, the King's Royal Hussars and the 2nd Royal Tank Regiment, each of which is the tank unit of an armoured or a mechanised brigade. Two squadrons of the 1st Royal Tank Regiment use Challenger 2 in a training / demonstration role.
Deliveries of Challenger 2 to Oman were completed in 2001.
The Trojan minefield breaching vehicle and the Titan bridge-laying vehicle based on aspects of the Challenger 2 were shown in November 2006; 66 are to be supplied by BAE Systems to the Royal Engineers, at a cost of £250M.[4]

Defence
Challenger 2 is one of the most heavily armoured and best protected tanks in the world.[6] The turret and hull are protected with second generation Chobham armour (also known as Dorchester) the details of which are still classified. Explosive Reactive Armour (ERA) kits are also fitted as necessary. The nuclear, biological and chemical (NBC) protection system is located in the turret bustle. On each side of the turret are five L8 smoke grenade dischargers. Challenger 2 can also create smoke by injecting diesel fuel into the exhaust manifolds.

[edit] Drive System
Engine: Perkins 26.1 litre CV12 diesel engine delivering 1,200 hp (895 kW).
Gearbox: David Brown TN54 epicyclical transmission (6 fwd, 2 rev).
Suspension: Second-generation Hydrogas.
Track: William Cook Defence Hydraulically Adjustable double-pin.
Maximum speed: 45 mph, 75 km/h (road) 25 mph, 40 km/h (cross country)
Range: 280 miles, 450 km (road) 156 miles, 250 km (cross country).