de Havilland Propellers

de Havilland Propellers. It was a pioneering British aerospace company established as a subsidiary of the de Havilland Aircraft Company to specialize in advanced propeller design and manufacture. The company became a world leader in propeller technology, particularly through its development of constant-speed propeller systems and, later, groundbreaking work on aircraft radar and guided missiles. Its innovations were critical to the success of numerous Allied aircraft during World War II and propelled British aviation into the jet and missile age.

History

The division was formed in 1935 at Hatfield, Hertfordshire, to consolidate and advance the de Havilland Aircraft Company's expertise in metal variable-pitch propellers. Under the leadership of engineers like John Crisp, it rapidly developed the Hydromatic constant-speed propeller, which became a vital contribution to the Royal Air Force's wartime capability. During World War II, the company's factories, including a major shadow factory at Lostock, produced over 150,000 propellers for aircraft such as the Supermarine Spitfire, Avro Lancaster, and North American P-51 Mustang. Post-war, the company diversified significantly, establishing a new research and development facility at Hatfield and embarking on projects in airborne radar and guided weapons, which led to its renaming as the de Havilland Engine Company in 1958 before its eventual absorption into the Hawker Siddeley group in 1961.

Products and technologies

The company's foundational product was the Hydromatic propeller, a robust constant-speed unit that automatically adjusted blade pitch for optimal engine performance across different flight regimes. This technology was licensed to the Hamilton Standard division of United Aircraft in the United States. Post-war, the company ventured into sophisticated radar systems, notably the AI Mk. IX radar for the Gloster Javelin and the Firestreak infrared homing air-to-air missile. It also developed the Blue Streak intermediate-range ballistic missile in collaboration with Rolls-Royce Limited and conducted early research into composite materials for propeller blades. These activities positioned the division at the forefront of transitioning from mechanical propulsion to electronic and missile systems.

Notable applications

de Havilland propellers were ubiquitous on British and Allied wartime aircraft. Key applications included the Supermarine Spitfire and Hawker Hurricane fighters, the Avro Lancaster and Handley Page Halifax heavy bombers, and the de Havilland Mosquito multi-role aircraft. Post-war, its propellers equipped the de Havilland Vampire, de Havilland Venom, and early models of the Vickers Viscount airliner. Its advanced systems found critical military use; the Firestreak missile was the primary armament for the English Electric Lightning interceptor, while its radar equipped the Gloster Javelin and de Havilland Sea Vixen. The ambitious Blue Streak project, though cancelled as a weapon, later formed the first stage of the Europa satellite launch vehicle.

Legacy and successors

The company's legacy is one of successful technological transition from propellers to guided weapons and avionics. Its absorption into Hawker Siddeley in 1961 saw its missile and radar activities continue under the Hawker Siddeley Dynamics banner, contributing to projects like the Sea Dart missile. These assets eventually passed to British Aerospace (BAE) following the Aircraft and Shipbuilding Industries Act 1977, and subsequently to BAE Systems. The propeller business itself was gradually wound down as the jet age advanced, but its pioneering work in constant-speed mechanisms set a global standard. The Stevenage site, originally developed for missile work, remains a major centre for MBDA and BAE Systems in advanced weapons design, directly tracing its lineage to the post-war endeavours of the propeller company.

Category:Aircraft component manufacturers of the United Kingdom Category:Defunct companies based in Hertfordshire Category:Manufacturing companies established in 1935