Pre-season test running of a 1943 Rolls-Royce Merlin aero engine.

David Irwin, co-founder of the Historic Aero Engines group, test running a Rolls-Royce Merlin Mk500-29 following winter maintenance.

HAE is a Facebook group of aero engine enthusiasts (see link below). The engine owners can display these engines at public events to inspire an interest in our aero engineering heritage, for visitors young and old.

It is being test run on a farm (ed. without neighbours!), before the start of the public event season. Check our Facebook page for the public event calendar.

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This Merlin is a single stage, two-speed supercharged, T24-2 spec engine rated at 1,620hp at +18psi supercharger 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).

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 engine for an Avro York used by RAF Transport Command. In the early 1950s the engine was renumbered and sold in a batch of 400 Merlins to CASA in Spain for use on the CASA 2.111 bomber. Obsolete by the mid 1970s and returned to the UK for use in a research wind tunnel until being acquired by David in 2007 (ed. from a batch of five engines that were due to be dismantled for spare parts).

contact: [email protected]
website:   / historicaeroengines  
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The Historic Aero Engine is a Facebook group of 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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