Gnome Sigma

The Gnome 7Σ Sigma (commonly called the Gnome 60 hp) is a French seven-cylinder, air-cooled rotary aero engine.[1]

Sigma
Gnome 7 Sigma as shown in a 1913 Gnome catalog
Type Rotary aero engine
National origin France
Manufacturer Société des Moteurs Gnome
Unit cost 13,000Francs

The Sigma produced 60 hp (45 kW) from its capacity of 9.5 l (579.73 cu in).

Specifications (7 Sigma)
Longitudinal elevation of Gnome 7 Sigma, from 1913 Gnome catalog

Data from Société Des Moteurs Gnome[2]

General characteristics

  • Type: 7-cylinder, single-row, rotary engine
  • Bore: 120 mm (4.72 in)
  • Stroke: 120 mm (4.72 in)
  • Displacement: 9.5 l (579.73 cu in)
  • Length: 1,125 mm (44.29 in)79 cm (31 in)
  • Diameter: 826 mm (32.52 in)
  • Dry weight: 79 kg (174 lb)

Components

  • Valvetrain: pushrod operated overhead exhaust valves plus pressure-driven inlet valves located in the piston crowns[3]
  • Fuel system: a single static Bloctube carburretor feeding the crankcase
  • Fuel type: 40 / 50 octane gasoline
  • Oil system: pressure-fed total loss, castor oil
  • Cooling system: Air-cooled
  • Reduction gear: Direct drive, right-hand tractor, left-hand pusher

Performance

  • Power output: 45 kW (60 hp) at 1,200 rpm
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See also

Comparable engines

  • Clerget 7Z
  • Le Rhône Type 7A
  • Le Rhône Type 7B
  • Le Rhône Type 7B2

Related lists

References

Notes
  2. Moteurs Gnome (PDF) (in French). Paris: Société Des Moteurs Gnome. October 1913. pp. 6–10. Retrieved 26 June 2018.

Bibliography
  • Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.
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