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

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Originally Posted by 41Sqn_Banks

However contrary to the Spitfire I manual the Spitfire II manual does not state that the boost control cut-out will provide +12 boost and that it is authorized for short time and emergency.

That the cut-out will provide +12 boost is obvious, it has the same boost control as the Merlin III and it is also proven by the later amendments.
The question that remains is when it was authorized.

Originally Posted by 41Sqn_Banks

Now that's a interesting find. The page without amendments only give +12 boost for take-off, but the 1939 documents states +12.5 boost for take-off.

However it's still clear from the June 1940 "List of content" that the page that contains the +12 emergency boost was not contained at that date and was added later and at that date only the page without +12 emergency boost was contained.

IMHO the easiest would be to get the combat reports of the "units concerned" (pun intended ) to find one that proofs the use of +12 in a Spitfire II or search in the National Archives for a similar doc like the one that clears the use of +12 emergency boost for Merlin XX.

Hi 41Sqn_Banks,

Please examine the following documentation showing Spitfire IIs of 611 Squadron using emergency boost in combat on 21 August 1940. This was very shortly after the Sptifire II first went operational in the RAF.