The Type B proved to be a real innovation: it was found that the two-man turret dramatically increased the rate of fire of either weapon, while still allowing both to be fired at the same time. Type B with a single two-man turret mounting a single machine gun and a short-barreled 47 mm OQF 3-pdr Gun. ![]() Type A with two turrets, each mounting a Vickers machine gun.High strength steel tracks gave over 3,000 miles (4,800 km) of life which was considerably better than most designs of the era. This was considered to be a fairly good system and offered better than normal cross-country performance although it could not compare with the contemporary Christie suspension. Upward movement of either set of bogies would force the other down through the spring. The Horstmann suspension used two axles, each of which carried a two-wheel bogie to which a second set of bogies was connected with a leaf spring. The power was provided by an Armstrong Siddeley engine of 80–95 horsepower (60–71 kW) (depending on the version), which gave it a top speed of 22 mph (35 km/h) on roads. ![]() The hull was made of riveted steel plates, 1 inch (25.4 mm) thick at the front and over most of the turrets, and about 3⁄ 4 inch (19 mm) thick on the rear of the hull. The first Mark E was built in 1928 by a design team that included the famed tank designers John Valentine Carden and Vivian Loyd.
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