There could be a reason for the difference;
read #1219. I know that there is a set of
Spitfire II notes on Scribd; these show that there have been no amendments and it is possible that the operational limits for the Merlin XII were originally set at +9 lbs boost, later pushed to +12 1/2 lbs. (Paragraph 4 of the attached document does state that the Merlin XII was cleared for this boost.) It is possible that on operational units an amendment slip specifying +12 1/2 lbs was issued with the notes.
There is a small possibility of printer error, for example on p3 it describes the Spitfire II as being "powered by a Merlin III..."
Correction: This particular set of notes does incorporate some amendments, on top of page 6 and 19 "Amended by A.L.No.6" - interesting; this indicates they could have been republished later than July 1940.
04-23-2012, 11:37 AM
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