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Crumpp, still some 17 years left of service, going for the full service time Anyways, when looking at that Spitfire Mk.II manual June 1940, paragraph 55 (stating it should be carefully noted) clearly says +12lbs up to 1000ft for take-off or maximum 3min. Rest seems to be +9lbs (all-out for 5min) with no alt restrictions. And continuous/max cruise is +7lbs. So that pretty much says it all IMHO.
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The Military is a good career. I did all of my time in Special Operations. Started out in Rangers and then went to Special Forces.
I agree with your interpretation on the Spitfire Mk II Notes.
It is a fact the Spitfire Mk II was using 100 Octane in June 1940 because the Notes On the Merlin engine specify that as the only option. The emotional investment in this issue so high that many participants confuse
In use with all operational units.
The Operating Notes are a followed and the proceduresYou cannot say "all operational" Spitfire Mk I's or Hurricanes were using 100 Octane in June of 1940.
The USAAF did the same thing when they converted to 100 Octane (100/130 grade). They published instructions to use 91 Octane for training and OCONUS and 100 Octane for operations. The Pilots Operating Handbooks reflect the fuel changeover after that Technical Order was published.
You don't see the Notes on the Merlin Engine being updated until January 1942.