The Gnome 9 Delta was a French designed, nine-cylinder, air-cooled rotary aero engine that was produced under license in Britain. Powering several World War I era aircraft types it produced from its capacity of . Variants DeltaThe baseline 9-cylinder rotary engine. Delta-DeltaAn 18-cylinder two-row rotary engine - Two Deltas on a common crankshaft. Applications List from Lumsden Avro Type 500 Caudron Type L Pemberton-Billing P.B.25 Royal Aircraft Factory S.E.2 Vickers No.7 Monoplane Vickers F.B.9 Gunbus Engines on display A preserved Gnome 9 Delta engine is on public display at the Musée des Arts et Métiers, Paris Specifications (9 Delta) See also References Air-cooled aircraft piston engines 1900s aircraft piston engines Delta Rotary aircraft piston engines