Tempest II due to fly at Eastbourne in August
Gnome de PPRuNe
Join Date: Jan 2002
Location: Too close to Croydon for comfort
Age: 60
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Re civvy Merlins, from Wikipedia...
I seem to recall that "transport banks" were favoured for the race-prepared Merlins at Reno as they had much better longevity - allied with Allison con rods which had the same stroke as the RR parts but seemed better suited to the abuse!
With the end of the war, work on improving Merlin power output was halted and the development effort was concentrated on civil derivatives of the Merlin.[22] Development of what became the "Transport Merlin" (TML)[23] commenced with the Merlin 102 (the first Merlin to complete the new civil type-test requirements) and was aimed at improving reliability and service overhaul periods for airline operators using airliner and transport aircraft such as the Avro Lancastrian, Avro York (Merlin 500-series), Avro Tudor II & IV (Merlin 621), Tudor IVB & V (Merlin 623), TCA Canadair North Star (Merlin 724) and BOAC Argonaut (Merlin 724-IC).[24] By 1951 the time between overhauls (TBO) was typically 650–800 hours depending on use.[25][26] By then single-stage engines had accumulated 2,615,000 engine hours in civil operation, and two-stage engines 1,169,000.[27]
Thread Starter
In the absence of news about the Sywell Tempest, an update on the P&W powered Canadian aircraft
Last edited by Fargo Boyle; 1st Sep 2022 at 10:10.
