Variants
The Hampden was powered by two 980 hp (730 kW) Bristol Pegasus XVIII nine-cylinder radial engines. A Mk II variant was developed as the HP.62 by converting two Hampdens to use the 1,000 hp (750 kW) Wright Cyclone engine in 1940 but no more was done of the project.
Interest in the HP.52 by the Swedish for placing a potential order led to the HP.53 prototype, which was subsequently used as a testbed for a pair of 1,000 hp (750 kW) Napier Dagger VIII 24-cylinder H-block air-cooled inline engines.
In 1936, the RAF ordered 150 Dagger-engined Hampdens as the Hereford. Problems with engine cooling resulted in most of those built (by Short & Harland) being re-engined as Hampdens. The surviving Herefords served in training units only.
Read more about this topic: Handley Page Hampden
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