Gnome Lambda was a 7-cylinder rotary engine rated at approximately 80 hp, one of the most important early rotary powerplants of the pre-war and early First World War period.

Designed in France and produced under licence in other countries, it became known for its light weight, compact construction, and good power-to-weight ratio for its time.

The engine was widely used in early military and training aircraft, and also served as the basis for the German-built Oberursel U.0.

Typical applications included:
• Avro 504
• Nieuport 10

Engines of this type represent the pioneering stage of rotary engine development before more powerful and specialized wartime designs became common.

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