alternatehistory.com

The Merlin was crucial to the RAF in WWII and has a good claim as being the engine that won the Air War, but suppose it wasn't what history shows it was. Suppose it proved to be unable to sustain the higher performance levels of the later versions, and was very unreliable at anything over 1,200HP. It still serves well until early 1941 but then the Allies are in trouble, where do they find the high performance engine they need until the Griffin is ready for service and how will this gap effect the war in general?
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