Gnome Delta

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This article refers to the two-valve Gnome rotary engine (automatic inlet valve in the piston crown and pushrod operated exhaust valve). For the 100 hp Monosoupape engine go to Gnome Monosoupape 9 Type B-2, (Monosoupape engines had a single pushrod operated exhaust valve and inlet ports exposed by the piston near bottom dead centre).

Type Rotary aero engine
Manufacturer Société des Moteurs Gnome
First run c.1909
Major applications Avro 500
Vickers F.B.9 Gunbus
Unit cost 22,000 Francs

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 100 horsepower (75 kW) from its capacity of 16 litres (990 cubic inches).[1]


List from Lumsden

Engines on display[edit]

Specifications (9 Delta)[edit]

Data from Lumsden.[1][3]

General characteristics

  • Type: 9-cylinder, single-row, rotary engine
  • Bore: 124 mm (4.88 in)
  • Stroke: 150 mm (5.91 in)
  • Displacement: 16.28 l (993.47 cu in)
  • Length: 1,150 mm (45.28 in)
  • Diameter: 1,020 mm (40.16 in)
  • Dry weight: 135 kg (297.6 lb)


  • Valvetrain: Automatic centre-piston inlet valve, one overhead exhaust valve per cylinder [4]
  • Fuel system: one static Bloctube carburettor feeding the crankcase
  • Fuel type: 40 / 50 Octane gasoline
  • Oil system: Total loss pressure fed
  • Cooling system: Air-cooled


See also[edit]

Comparable engines
Related lists



  1. ^ a b Lumsden 2003, p. 152.
  2. ^ Hauet (2001) p.55
  3. ^ Moteurs Gnome (PDF) (in French). Paris: Société des Moteurs Gnome. October 1913. pp. 6–10. Retrieved 3 October 2014. 
  4. ^ Angle 1921, p. 212.