Gnome Delta

Delta
	Gnome 9 Delta as shown in a 1913 Gnome catalog
Type	Rotary aero engine
Manufacturer	Société des Moteurs Gnome
First run	c.1909
Major applications	Avro 500; Vickers F.B.9 Gunbus
Variants	Oberursel U.I

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 hp (75 kW) from its capacity of 16 litres (980 cu in).^[1]

Variants

Delta: The baseline 9-cylinder 100 hp (75 kW) rotary engine.
Delta-Delta: An 18-cylinder 200 hp (150 kW) two-row rotary engine - Two Deltas on a common crankshaft.

Applications

List from Lumsden

Engines on display

A preserved Gnome 9 Delta engine is on public display at the Musée des Arts et Métiers, Paris

Specifications (9 Delta)

Gnome 18 Delta-Delta from the 1913 Gnome catalog

Data from Lumsden.^[1]^[3]^[4]

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)

Components

Valvetrain: Automatic centre-piston inlet valve, one overhead exhaust valve per cylinder.
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

Performance

Power output: 75 kW (100 hp) at 1,200 rpm
Specific fuel consumption: 362 g/(kW·h) (0.6 lb/(hp·h))

References

^ ^a ^b Lumsden, Alec S.C. (1994). British piston aero-engines and their aircraft (1. publ. in the UK. ed.). Shrewsbury: Airlife Publ. p. 152. ISBN 1-85310-294-6.
^ Hauet, André (2001). Les Avions Caudrons. Vol. 1. Outreau: Lela Presse. p. 55. ISBN 2 914017-08-1.
^ Moteurs Gnome (PDF) (in French). Paris: Société des Moteurs Gnome. October 1913. pp. 15–18. Retrieved 26 June 2018.
^ Angle, Glenn D. (1921). Airplane Engine Encyclopedia. Dayton, Ohio: THE OTTERBEIN PRESS. p. 212.

[Lumsden-1] Lumsden, Alec S.C. (1994). British piston aero-engines and their aircraft (1. publ. in the UK. ed.). Shrewsbury: Airlife Publ. p. 152. ISBN 1-85310-294-6.

[Hauet-2] Hauet, André (2001). Les Avions Caudrons. Vol. 1. Outreau: Lela Presse. p. 55. ISBN 2 914017-08-1.

[gnomedelta-3] Moteurs Gnome (PDF) (in French). Paris: Société des Moteurs Gnome. October 1913. pp. 15–18. Retrieved 26 June 2018.

[Angle-4] Angle, Glenn D. (1921). Airplane Engine Encyclopedia. Dayton, Ohio: THE OTTERBEIN PRESS. p. 212.

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