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As is all the operational squadron records posted that say otherwise to your position that you keep ignoring.
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Fruitbat,
I have not ignored any evidence at all. Re-read those squadron logs, please. The technical order specifies aircraft will be converted on their schedules Service Inspections.
When that conversion is complete, by convention it will be a logbook entry. Most importantly, if they are actually using the fuel that will also be a specific logbook entry by convention.
It will plainly state they are using 100 Octane. Not only will their aircraft be logged as converted, it will be logged they are actually using the fuel.
A single entry of aircraft being converted does not mean they are running around using 100 Octane fuel, only that the aircraft is capable of using it if available and authorized. When my aircraft was converted to use auto fuel, it too got a logbook entry noting it was Supplemental Type Certificated for auto fuel. The aircraft was properly placarded too. That does not mean autofuel is in my fuel tanks!!
It just means the airplane has the capability to use it.
It is the exact same thing with the conversion to 100 Octane. You just can't put the fuel in the tanks and fly off. The airplane has to be placarded, major changes done to the engine, and the proper knowledge given to the pilots as well those that maintain the aircraft. Why, because it is the law and that law conforms to international aviation convention that has been in place since 1919.
The conversion was done on a schedule at the annual Service Inspection. That is what gave the manufacturer time to make the cylinder heads and logistics to distribute them. Once the Operational conversion was ready to adopt 100 Octane fuel, new Operating Notes would be published reflecting that change as we see in January 1941. There is some lag time. I would bet the RAF began conversion in June 1940 and fully converted sometime in December or November, 1940 before the wartime British end dates for the Battle of Britian. That is why you find references to the RAF converting during the battle.