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Re: Placing the Fairey Battle.
Re P-39. I suggest you raise this as a separate thread. A very interesting subject. The effectiveness of the Typhoon is well recorded - see Nick's postings - and accounts of the battle of Mortain (?), amongst others.
Re Critical Mach Number: I refer you to Hoerner's Fluid Dynamic Drag, which presents the equation of the curve defining this parameter, and how the results from a wide range of aircraft fit closely on it. I forget the chapter/page number, or quite where I placed my copy of the relevant pages (I don't own a copy of the book, unfortunately). If I get the time, and remember, I'll look for it tonight, but I think I'm on family ferrying duty.
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