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The Gnome 7Σ Sigma is a French seven-cylinder, air-cooled rotary aero engine.
The Sigma produced 60 hp from its capacity of 9.5 l.
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The Gnome 7Σ Sigma is a French seven-cylinder, air-cooled rotary aero engine.
The Sigma produced 60 hp from its capacity of 9.5 l.