The Sunbeam Spartan was a British 12-cylinder aero-engine designed and built in 1916. Design and development Louis Coatalen concentrated on water-cooled engines for the most part, but did design an air-cooled V-12 named Spartan. Little is known of this engine which had a bore of and stroke of , capacity of and output of driving a propeller through a reduction gearbox. The single overhead camshaft operated two inlet and two exhaust valves per cylinder via rockers, and ignition was supplied by two 6-cyl. magnetos supplying spark to one spark plug per cylinder. Specifications (Spartan) See also References Bibliography Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. . External links Spartan 1910s aircraft piston engines