The Marks I and II of the Light Dragon were relatively expensive and specialised, and in search of something cheaper Vickers-Armstrongs produced the DA50 in 1934. This vehicle was developed into two variants: the Machine Gun Carrier Mk I, which became the basis for the
Bren Carrier, and an artillery tractor, the Light Dragon Mark III. The Mark III had no position for the Vickers machine gun and more space in the back. The wheelbase is shorter than the Mark II, with only three road wheels per side, and only one return roller. The front sprockets are spoked, with solid rear idlers - the reverse of the Light Dragon Marks I and II. For identification purposes the Light Dragon Mark III has the rear sprocket set high, and the suspension springs form a triangle shape - in contrast with the
Light Tank Mk IV, which has the rear sprocket on the ground and suspension springs both pointing the same way. The sloping front was re-designed with a flat vertical section immediately in front of the driver: the headlights are mounted on boxy extensions at driver level. Distinctive forward-sloping mudguard wings cover the tracks at the front of the vehicle, in common with the Machine Gun Carrier Mk I. The engine, gearbox and transmission were all made by
Ford: the centrally located engine was a commercial
V-8, coupled to a 4-speed gearbox with 1 reverse, driving a standard truck rear axle and differential. The steering, probably the invention of
Sir John Carden and his assistant Leslie Little, was a great improvement on the earlier Dragons. The front suspension units were mounted on a common axle which was capable of being moved laterally sideways. When the driver turned the steering wheel a small amount, both front bogies were pushed sideways which bent the tracks. For tighter turns, a greater movement of the steering wheel brought
skid steering into play, where a clutchless brake was applied to one side or other of the differential. Sixty-nine Vickers D50s were bought by the army for conversion to Light Dragons Mark III.
See also Universal Carrier § Design and development. ==Variants==