de Havilland Gipsy Queen 30
Engine overview:
The non-supercharged Gipsy Queen 30 engine was produced specifically for the four engine DH114 Heron.
Engine specifications:
Number of Cylinders: 6
Bore: 120 mm
Stroke: 150 mm
Capacity: 10.18 litres
Maximum Brake Horsepower (BHP): 240
First engine delivered: April 1947
Number built: 1,740