de Havilland
In 1941, de Havilland were asked to build a new aircraft and engine. The company decided on a 3000 lb turbojet which was initially known as the Halford H1, after its designer, Major Frank Halford. The engine later became known as the de Havilland Goblin. The aircraft was the de Havilland Vampire.

In 1944 the de Havilland engine company was formed as a separate concern with Halford becoming chairman of the new company. The H2 Ghost was a larger development of the Goblin and was used to power the worlds first turbojet powered passenger aircraft, the de Havilland Comet Mk1.

The company produced the large H4 Gyron engine which first ran in 1953. Although the Gyron went on to develop a healthy 27,000 lbs thrust with reheat, it never found its way into a production aircraft. The Gyron did however produce an offspring in the form of the Gyron Junior. The Junior, which was produced in 1955, was a 0.45 scale version of the Gyron. Producing 7,100 lbs thrust, it found a home in the Blackburn Buccaneer S1.

de Havilland also produced several rocket engines, two of which powered the distinctive Saunders Roe SR53 and SR177 rocket/jet engined hybrid fighters. In 1959 the de Havilland engine company merged with Bristol Siddely engines.
de Havilland Gyron
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