Vickers Main Battle Tank Mark 3
The Vickers MBT Mk. 3 is a main battle tank by Vickers, a development of the Vickers MBT, and introduced in 1975 for the export market. It was the last of the Vickers tanks to see sales in numbers abroad. History. In 1974, Vickers pressed on with development of a Mark 3 version of their Vickers MBT. This stems from Design No. 51400 T and differs from the Mark 1 mainly in having a turret with a well-shaped cast front welded to a fabricated armour plate body. It also has a cast gun  mantlet which is better shaped from the point of view of its resistance to armour-piercing projectiles than the flat mantlet of the Mark. 1. The Mark 3 embodies various other improvements, such as an increase in the depression of its main gun from -7 to -10 degrees below the horizontal and an increase in the ammunition from 44 to 50 rounds. The first production order for Mk. 3 tanks was placed in 1977 by the Government of Kenya. In 1977, Vickers acquired a 100 million pounds trade deal to produce 76 Mk. 3 MBT and 7 Mk. 3 ARV /ARRV for the Kenyan Army. They were built at the Vickers Scotswood factory in Newcastle between 1977 and 1981. In 1981, after five years of negotiations, Vickers signed a 115 million pounds contract to provide 108 Mk. 3N "Eagle" tanks, 15 Mk. 3 AVLB and 18 Mk. 3 ARV/ARRV to the Nigerian Army. Tanzania took delivery of two Mk. 3 ARVs which are used to recover Chinese supplied MBTs. In 1990, Nigeria ordered 64 more Mk. 3 for an amount of 282 million pounds. In 2015, several Mk.3N Eagle of the Nigerian Army were involved in the combats in  Yola as part of the Boko Haram insurgency, some of them were captured by Boko Haram insurgents and later re-captured by the Nigerian Army in Maiduguri. Technical characteristics. The Mk. 3 retains most of the proposed features of the Mk. 2. Others were the provision for infrared/white-light searchlights and the abandonment of flotation gear. A laser rangefinder of the type being fitted to the Chieftain was also proposed since the range of the L7 105 mm gun was well beyond that of the 12.7 mm ranging machine gun fitted. Some thought was also given the idea of  mounting the heavier British L11 120 mm gun on the Vickers tank, but this was abandoned because the 105 mm L7-series rifled gun was becoming the NATO standard, 120 mm ammunition was more expensive than 105 mm and was used only by the British Army in Europe, and the weight advantage of the Vicker's tank would be reduced. Sighting/Fire control. The gunner is provided with a Barr & Stroud Tank Laser Sight (TLS) which was also featured on the FV4201 Chieftain main battle tank. The TLS has a magnification of ×1 and ×10, which is also provided with  a ballistic graticule. The gunner's sight is linked to gun by a temperature-compensated link bar and to a collimator in the commander's cupola. The collimator projects an illuminated ballistic graticule image into the field of view of the commander's sight when the cupola and the turret are lined up. The commander can consequently lay and fire the main armament should the need arise. The commander is provided with a contra-rotating gear system that automatically lines up the turret (and therefore turret armaments) with the day/night sight. The cupola has one day/night sight periscope  with a magnification of ×1 and ×10, and six periscopes for all-round observation. The Marconi Radar and Control Systems EC620 system provides full weapon stabilisation. The Marconi Radar Control System SFC 600 computerized system is used as fire control system. Mobility. The Mk. 3 is powered by a General Motors Detroit Diesel 12V-71T two-stroke diesel engine developing 720 bhp. A Rolls-Royce CV12 TCA developing 800 bhp was offered as an option. The suspension consist of torsion bars with smaller secondary torsion bars at wheel stations 1,2 and 6. Protection. Maximum protection is over the frontal arc  of 60° on the welded hull and 45° on the cast turret. Elsewhere, protection is provided against near-burst medium artillery. Protection against mines is by means of additional floor patch plates.