De Havilland Gipsy Twelve
# De Havilland Gipsy Twelve

The de Havilland Gipsy Twelve was a British aero engine developed by the de Havilland Engine Company in 1937. Approximately 95 were manufactured. It was known as the Gipsy King in Royal Air Force service.

## Applications

* de Havilland DH.91 Albatross
* de Havilland DH.93 Don

## Engines on display

Preserved de Havilland Gipsy Twelve engines are on public display at the following museums:

* de Havilland Aircraft Museum
* London Science Museum.

## Specifications (Gipsy King I)

Data from Lumsden

### General characteristics

* Type: Inverted 60 degree V-12 piston engine
* Bore: 4.646 in (118 mm)
* Stroke: 5.512 in (140 mm)
* Displacement: 1121.3 cu in (18.4 L)
* Length: 82.6 in (2,098 mm)
* Width: 31.5 in (800 mm)
* Height: 37.4 in (950 mm)
* Dry weight: 1,058 lb (480 kg)

### Components

* Valvetrain: Overhead valve
* Supercharger: Single speed
* Fuel type: 87 Octane petrol
* Cooling system: Air cooled
* Reduction gear: Spur geared, reduction ratio 0.667:1

### Performance

* Power output: 425 hp at 2,450 rpm at 0 psi boost (five minutes maximum)
* Compression ratio: 6:1
* Power-to-weight ratio: 0.4 hp/lb
