Gnome Sigma
# Gnome Sigma

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

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

## Specifications (7 Sigma)

Data from Société Des Moteurs Gnome

### 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
* 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
