Rotary Radial Engines Early engine makers developed a method of providing adequate cooling air by designing a configuration in which the crankshaft was fixed to the airframe while the entire crankcase and cylinders rotated. The concept was pioneered by French automotive engineers Louis and Laurent Seguin, who founded the “Societe des Moteurs Gnome” in Gennevilliers, near Paris, in 1905. Claimed to be the first company dedicated to aircraft propulsion, its famous lightweight ...

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