Gnome Monosoupape 9N was a 9-cylinder rotary engine rated at approximately 160 hp, representing one of the most advanced developments of the Gnome engine series during the later stages of the First World War.

The “Monosoupape” (single-valve) system simplified the engine design compared to earlier Gnome types, reducing mechanical complexity while maintaining high power output.

This engine was primarily used in late-war French aircraft and experimental designs, where increased performance was required from rotary engines.

Typical applications included:
• Nieuport 28
• Various late-war French aircraft and experimental designs

Engines of this type represent the final stage of rotary engine evolution before more efficient inline and radial engines became dominant.

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