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 1050NaN0 and stroke of 1300NaN0, capacity of 14.030NaN0 and output of 1490NaN0 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.