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The Bristol Neptune was a seven-cylinder air-cooled radial engine developed in 1930. It had the same size cylinders as the earlier Mercury and Titan engines, 5.75 in (146 mm) x 6.5 in (165 mm) which gave a displacement of 1,182 cu in (19.3 L) and produced a maximum of 320 horsepower (239 kW). The Neptune was effectively a seven-cylinder version of the Titan.[1]
| Neptune | |
|---|---|
 | |
| The Bristol Neptune | |
| Type | Radial aircraft engine |
| Manufacturer | Bristol Aeroplane Company |
| First run | 1930 |
| Major applications | Bristol Type 110 |
| Developed from | Bristol Titan |
Data from Lumsden. [1]
General characteristics
- Type: 7-cylinder air-cooled radial engine.
- Bore: 5.75 in (146 mm)
- Stroke: 6.5 in (165 mm)
- Displacement: 1,182 cu in (19.3 L)
- Diameter: 48.4 in (1229.3 mm)
- Dry weight: 630 lb (286 kg)
- Designer: Roy Fedden
Components
- Valvetrain: Overhead valve, Four valves per cylinder
- Fuel type: 73-77 octane petrol
- Cooling system: Air-cooled
- Reduction gear: Direct drive, left hand tractor
Performance
- Power output: 295 hp (220 kW) at 1,700 rpm (rated power), 320 hp (239 kW) at 1,870 rpm at sea level
- Compression ratio: 5:1
- Power-to-weight ratio: 0.5 hp/lb (0.83 kW/kg)
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Related development
Comparable engines
- Armstrong Siddeley Cheetah
- Armstrong Siddeley Lynx
- Avia Rk.17
- Gnome-Rhône 7K
- Jacobs R-915
- Piaggio Stella P.VII
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