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But at the start of this thread even that notion was disputed, and
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Read my first post in this thread. Your perception is totally wrong if you include me, fruitbat.
I said I don't know and niether does anyone else. We still don't know an exact date.
It is a fact that conversion of all operational Spitfire Mk I's was important enough to warrent a warning in paragraph 1, operating limitations of the Pilots Operating Notes in January, 1941.
We can definately say that full conversion did not take place in June 1940 or earlier as no such warning exist's in the Operating Notes.
Based on the ever increase amount of 100 Octane at the airfields evidenced in Table II, it is highly unlikely it was the major fuel until around October, 1940.
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were spits running around with the potential to go to 12lbs boost, and they were almost certainly in 11 group during the BoB, yes/no?
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Yes but not all of them and certainly not the entire Fighter Command.
The frequency would depend on the timeframe and the dates one picks for the battle. It looks to me like the fuel came into use in July and gradually became more common until total conversion around January.
If you say the Battle of Britian lasted from July to 15 September, 100 Octane is pretty limited.
If you say the battle went from July to December then 100 Octane was probably the standard at the end of it.