Coatalen continued to experiment with ever-more odd designs such as the star-layout Sunbeam Malay, which never got beyond a prototype, the air-cooled Sunbeam Spartan and the diesel-powered Sunbeam Pathan. However Sunbeam was successful with the introduction of newer manufacturing techniques and became one of the first to build aluminium single-block engines, a design that would not become common until the 1930s. Vehicles and aircraft During the First World War Sunbeam built trucks and ambulances. It also participated in the Society of British Aircraft Constructors pool which shared aircraft designs with anyone that could build them. In this role Sunbeam produced 15 Short Bombers powered by their own Sunbeam Gurkha engines, 20 Short Type 827s, 50 Short 310s, and others including Avro 504 trainers; they even designed their own Sunbeam Bomber, which lost to a somewhat simpler Sopwith design. Sunbeam had produced 647 aircraft of various types by the time the lines shut down in early 1919. End of an era and sale to Darracq Marston's third son, Roland, had been expected to take over as chairman of Sunbeam but he suddenly died in March 1918 and John Marston himself died the morning after Roland's funeral. He was aged 82. Cureton was already in poor health and would die in 1921. They had made Coatalen a joint managing director in 1914 alongside William Marklew Iliff (1873–1957). S.T.D. Motors In June 1920 Darracq bought Wolverhampton's Sunbeam Motor Car Company Limited. In 1919, following the First World War, Darracq had bought a London motor manufacturer, Clément-Talbot. The Sunbeam Talbot and Darracq businesses retained their separate identities. The Sunbeam car would continue to be made at Moorfield Works, Wolverhampton, the Talbot in North Kensington and the Darracq at Suresnes with central buying, selling, administration and advertising departments with S T D in Britain On 13 August 1920 Darracq changed its name to S T D Motors Limited. The initials represented Sunbeam, Talbot and Darracq. S.T.D. Motors Limited had been first incorporated in London in 1905, at that time bearing the name A Darracq and Company (1905) Limited, though it continued to manufacture its Darracq cars in Suresnes, Paris. S T D Motors Limited group in 1924 Clement-Talbot Limited: Talbot cars Darracq Motor Engineering Company Limited: motorcar bodies and assembly of French-sourced Talbot components for sale in the British market as Darracq-Talbot cars. Sunbeam Motor Car Company Limited: Sunbeam cars Jonas Woodhead & Sons Limited: