Effect of boost control cutout prior to +12 psi boost modifications

[lane]

Originally Posted by ICDP

Remember your linking to info on the Merlin II and III, the document Seadog is linking to is for a Merlin XX.

Oh, I certainly got that, sorry if I didn't communicate the point effectively. The issue I was addressing was that the operational use of a modification may precede, or follow for that matter, the official Air Publication document announcing the clearance or mod. Since Merlin III's were modified to operate at +12 lbs at the unit level before the publication date of the mod, it follows that the Merlin XX may also have been operated with +12 lbs emergency at the squadron level prior to the 15 November 1940 publication date.

For example:
16 February 1940 Operational conversion to the modification

20 March 1940 Publication of the modification

Originally Posted by ICDP

The Merlin XX was not used by fighters during the Battle of Britain so its boost rating is irrelevant since we don't have any flyable plane in CoD with a Merlin XX.

I agree that the Merlin XX has little to do with anything with respect to Viper’s initial subject or the sim FMs. Try telling that to TomcatVip though I’m less certain about your position on introduction into service of the Hurricane II with Merlin XX. See Seadog’s post #40: "The Hurricane/Merlin XX was introduced to combat in August 1940, but not given the designation Hurricane II until Sept 1940." McKinstry writes of the Hurricane II: "The first models emerged from the Langley works in September 1940, going into service initially with 111 'Treble One' Squadron and then replacing other Fighter Command units over the coming months."