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there is no source that states that this is incorrect,
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Yes there is a primary source that refutes the secondary source you posted, Seadog.
The
seventh conference on 18 May 1940 clearly states that certain units in Fighter Command will make the switch.
That document has been posted ad nauseum.
As this on going fuel debate....
The best source on German Aviation Fuels is the Fischer Tropsch Archives.
http://www.fischer-tropsch.org/
They have a good collection of documents online anyone can learn about German fuels. Allied Fuel and German fuels were not directly comparable.
B4 is slightly better than 87 grade Allied fuels and is roughly equal to 91/~115 octane.
C3 began as the equivalent to 100/130 grade allied fuels and was later improved to 100/140 grade which allowed such improvements as a straight manifold pressure increase without additional knock limiting performance enhancement to 1.62ata in the BMW801D2 series and 1.98ata in the DB605 series engines.
C3 was adopted in 1940 and was used during the BoB.
The whole debate is silly and pointless. The arguments are put forth by gamers to make their personal game play more enjoyable such that a game shape performance can overcome their own inadequacies. It is an agenda advanced by clowns who focus on whatever specific portion paints the desired picture without regard to the whole.
The facts are the German fuel was roughly equal but on the whole slightly inferior to the natural petroleum. The Allied fuels were better but allied engine technology could not take full advantage of their superior fuels. The German materials technology, chemical engineering, and fuel metering technology was much better and made up for the lower quality fuels.
Just the fact the Germans had direct fuel injection technology and the allies never did balances any fuel differences. One can make considerable power gains without changing fuel type just by changing the fuel metering system from a carburetor or Throttle Body Injection to Direct Injection. In a 1000 hp engine, you can expect to gain 80-150 hp just by changing the fuel metering method.
The whole debate ends up being a wash.