Is it possible that the mechanical parts of the cockpit instrument itself are being affected by G-loading? I know this was a problem with some Smiths tachometers fitted to various racing cars in the 60s. When they came to Daytona to run the 24 hour race the drivers were reporting visual RPM drops when the cars were on the high banking at speed. The G forces were actually pulling the needle down.
Just a thought.
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Personally speaking, the P-40 could contend on an equal footing with all the types of Messerschmitts, almost to the end of 1943.
~Nikolay Gerasimovitch Golodnikov
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