David Irwin, co-founder of Historic Aero Engines (see Facebook link), testing a Rolls-Royce Merlin Mk500-29 following winter maintenance. All HAE display engines are tested before the start of the event season, with any issues resolved before the first public events.

This Merlin is a single stage, two-speed supercharged, T24-2 spec engine rated at 1,620hp at +18psi boost pressure. The propeller is a fully functioning Hamilton Standard 23EX, with constant speed and feathering functions, and has been cropped to 8 feet diameter from its original 13 feet. Maximum display power is typically 2,300rpm at -2psi boost (approximately 500hp).

Maintenance included changes to the oiling and filtering system, and well as the standard winter service. (Check our Facebook page for public events).

Original manufactured as a Merlin Mk22 in June 1943 at the Rolls-Royce Derby factory in England, probably for an Avro Lancaster Mk1. Upgraded in 1945 to a T24-2 for an Avro York used by RAF Transport Command. Renumbered and sold in a batch of 400 Merlins to CASA in Spain for use on the CASA 2.111 bomber. Obsolete by the 1970s and returned to the UK for use in a research wind tunnel until being acquired by David in 2007.

contact: [email protected]
website:   / historicaeroengines  
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The Historic Aero Engine group comprises aero engine enthusiasts from a variety of engineering and technical backgrounds, who share a common interest in researching, restoring, and preserving our aero engine heritage. Some of the engines are restored to ground running condition, and when invited, can display these at public events as a means of celebrating our heritage and inspiring the next generation of young engineers.

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