Gipsy Minor
de Havilland Gipsy Minor at the de Havilland Aircraft Heritage Centre
Type	Piston inline aero-engine
Manufacturer	de Havilland Engine Company
First run	1937
Major applications	de Havilland Moth Minor Short Scion
Number built	171
Developed from	de Havilland Gipsy

The de Havilland Gipsy Minor or Gipsy Junior is a British four-cylinder, air-cooled, inline engine that was used primarily in the de Havilland Moth Minor monoplane, both products being developed in the late 1930s.

Design and development

The engine was a simplified and smaller version of the earlier de Havilland Gipsy. It featured only one magneto where dual ignition was normal for the Gipsy series of engines. A total of 171 engines were produced, including 100 built in Australia as production moved to that country due to the start of the Second World War.^[1]

Applications

• De Havilland Moth Minor
• Short Scion
• Druine Turbi

Engines on display

• A de Havilland Gipsy Minor engine is on public display at the de Havilland Aircraft Heritage Centre, London Colney, Hertfordshire.

Specifications (Gipsy Minor)

Data from ^[2]

General characteristics

• Type: 4-cylinder air-cooled inverted inline piston aircraft engine
• Bore: 4.016 in (102 mm)
• Stroke: 4.528 in (115 mm)
• Displacement: 229.29 in³ (3.759 L)
• Dry weight: 216 lb (98 kg)

Components

• Valvetrain: Overhead valve
• Fuel type: Minimum 70 octane petrol
• Oil system: Dry sump, gear-type pump
• Cooling system: Air-cooled

Performance

• Power output: 90 hp at 2,600 rpm
• Compression ratio: 6:1
• Power-to-weight ratio: 0.41 hp/lb