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Re: P-47 Actions 29 Mar 44 near Berlin
Bill, according to Eric Morgan the data you seek was published in a report by RAE Farnborough in June 1945, based on trials the previous year. The purpose was to measure profile drag measurements on the Spitfire's wing at high speeds. The test aircraft was Spitfire Mk XI serial number EN409. The chief test pilot was Squadron Leader Tony Martindale.
If not interested in the original report you could can read summaries in The Spitfire Story by Alfred Price or the hefty Spitfire: The History by Eric Morgan.
The second edition of the Price book contains a photo of EN409 after it was seriously damaged in the controversial dive of 27th April 1944, in which the pilot claimed to have reached 606 mph, and Mach .89. After the motor was destroyed he made a successful landing, wheels down, minus propeller and parts of the engine.
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