Trojan

The company was founded by Leslie Hayward Hounsfield (1877–1957) who went into business as a general engineer in a small workshop called the Polygon Engineering Works in Clapham, South London. He got the idea to make a simple, economical car that would be easy to drive and started design work in 1910. Hounsfield was a Whitworth Exhibitioner in 1898 and President of the Whitworth Society in 1946.

In 1913 a prototype was completed. It had a two-stroke engine with four cylinders arranged in pairs, and each pair shared a common combustion chamber – a doubled-up version of what would later be called the "split-single" engine. The pistons in each pair drove the crankshaft together as they were coupled to it by a V-shaped connecting rod. The claim was that each engine had only seven moving parts, four pistons, two connecting rods and a crankshaft. This was connected to a two-speed epicyclic gearbox, to simplify gear changing, and a chain to the rear wheels. Solid tyres were used, (even though these were antiquated for car use), to prevent punctures and very long springs used to give some comfort.

War broke out before production could start, and from 1914 to 1918, Trojan Ltd, as the company had become in 1914, made production tools and gauges. In 1920 the first series of six cars was made from a works in Croydon · · and the final production version was shown at the 1922 London Motor Show. An agreement was reached with Leyland Motors to produce the cars at their Kingston upon Thames factory · · · ·, where work on reconditioning former Royal Air Force wartime trucks was running down. This arrangement continued until 1928, when Leyland wanted factory space for truck production. During the nearly seven years of the agreement 11,000 cars and 6700 vans were made.