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Hawker Hector with Napier Dagger III engine

Hawker Hector with Napier Dagger III engine


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Hawker Hector with Napier Dagger III engine

A detail of a Hawker Hector focussing on the Napier Dagger III H-24 air-cooled piston Engine. Developing 805hp the Dagger was the next step for D. Napier and Sons toward the ultimate British piston Engine of World War II, the Napier Sabre. Unlike the later Sabre the fast running Dagger was air-cooled and used conventional poppet-valves, rather than the troublesome sleeve-valves of the Sabre and large Bristol radial Engines. ( Engines of H-configuration had two crankshafts side-by side, both driving the same reduction gearbox to give one output. In some contemporary H- Engines, such as the Fairey Prince, the crankshafts each drove one half of a contra-rotating propeller and could be individually shut done.) Date: 1970s

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Media ID 21130613

© The Peter Butt Aviation Collection / Mary Evans

Air Cooled Bristol Conventional Dagger Developing Driving Drove Engines Fairey Fast Give Half Hawker Hector Napier Output Piston Propeller Radial Reduction Running Sabre Shut Sons Step Troublesome Ultimate Unlike Focussing Gearbox


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> Europe > United Kingdom > England > Bristol > Bristol

> Historic > World War I and II > Airplanes and aviation

> Historic > World War I and II > World War II

> Mary Evans Prints Online > Peter Butt Transport Collection


EDITORS COMMENTS
This photograph showcases a detailed view of a Hawker Hector aircraft, with the focus squarely on its Napier Dagger III H-24 air-cooled piston engine. Developing an impressive 805 horsepower, the Dagger marked a significant step forward for D. Napier and Sons in their quest for the ultimate British piston engine of World War II. In contrast to the later Napier Sabre, the Dagger was air-cooled and employed conventional poppet valves, rather than the problematic sleeve valves of the Sabre and large radial engines. The H-configuration of the Dagger engine was unique, as it featured two crankshafts side by side, both driving the same reduction gearbox to produce one output. In contrast to some contemporary H-engines, such as the Fairey Prince, the crankshafts each drove one half of a contra-rotating propeller and could be individually shut down. The Napier Dagger III engine, which dates back to the 1970s, was a precursor to the more famous Napier Sabre engine. Despite its air-cooling system and conventional valves, the Dagger was a fast-running engine that delivered impressive power for its time. This photograph offers a fascinating glimpse into the intricacies of aviation engineering during the post-World War II era.

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