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The gearheads of this forum will certainly remeber the Rolls Royce 'R' engine, that managed to capture several speed records, whether in aircraft, cars or boats. Developed from the RR Buzzard, it was managing beyond 2500 HP in racing trim once debugged.
The POD might be that RR says to themselves by early 1930s:
-Okay, developing and setting production for several engine types might be wasteful. Lets make one main engine type, for front-line aircraft, that is based on the R engine. Needs of lower powered engines are and will be met by Kestrel line.

So, for better or worse, there is no Goshawk, Merlin, Exe and Peregrine, there is just the 'R minus' that gives, say, 1300 HP at 15000-16000 ft on 87 oct fuel by 1935. Aircraft designed around it are 'Battle', 'Hurricane' and 'Spitfire' for the starters. On 100 oct fuel, engine makes 1600 HP at ~10000 ft, just for the BoB. Version with iprovements, including the S/C, is available my mid 1940, Packard makes that version under the license.

Whatdaya think - how much is this scenario better for the Allied war effort, what are downsides, what might be likely German answers (provided the can come out with better thins than per OTL, apart from the 'more DB 603s' hymn?). Post 1940 development (the 2-stage S/C comes to the mind easily)?
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