Inaccurate performance data for BOB fighters in COD comparing to RL data

[Crumpp]

100 octane fuel was cleared for operational and non-operational flying by A.L.2 for Section 1 (which is dated May 1940 and way before June 1940):

It does not say that Banks.

It says if the aircraft is suitably modified, it may be used.

That is not the question. There is no doubt, the RAF began the process of operational conversion by June 1940 even in the Spitfire Mk I's.

The language is very specific when something is adopted.

If the Spitfire Mk I's were to use only 100 Octane fuel or all Operational Units, even in July 1940 it would state that under Notes Concerning the Merlin Engine:

Spitfire Mk II Notes, July 1940:



Spitfire Mk I Notes June 1940:



There is no evidence the conversion was complete until January 1942 when the Spitfire Mk I's Operating Notes are amended to reflect ALL OPERATIONAL UNITS:

May 1940 and way before June 1940

That is the June 1940 Operating Notes. A.L No.2 was incorporated into Volume I Section 2 the June 1940 republication of the Operating Notes.

Volume I Section II is from May 1940 but as noted, incorporates all the updates available at the time of June 1940 republication.

There was no Section 2 Paragraph 1 "Operating Notes" in June 1940.

Looks like they did rearrange the format. That happens and finally by convention we all have the exact same format today. That does not change the fact the principles are all the same by convention.

You can see in the July 1940 Spitfire Mk II notes, the format is the same as the June 1940 Spitfire Mk I notes. If 100 Octane was the fuel for all operational Spitfire Mk I's, Notes Concerning the Merlin Engine would clearly state that fact.

It does not and you can conclude for a fact, 100 Octane was not being used by all operational Spitfire Mk I's at that time.