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evidence: Le Rhone was the name given to a series of popular rotary aircraft engines produced in France by Societe des Moteurs Le Rhone and the successor company of Gnome et Rhone .. rotary aircraft engines. Rotary engine. Societe des Moteurs Le Rhone. Gnome et Rhone#Le Rhone. Gnome et Rhone. Gnome et Rhone. They powered a number of military aircraft types of the First World War .. First World War. World War I. Le Rhone engines were also produced under license worldwide .. Although not powerful -LRB- the largest wartime version produced 130 hp -RRB- , they were dependable rotary engines .. The Le Rhone 9 was a development of the Le Rhone 7 , a seven-cylinder design .. Examples of nine-cylinder Le Rhone rotary engines are on public display in aviation museums with several remaining airworthy , powering vintage aircraft types .