How much fuel was in the aircraft during any of these tests? That could be another factor that affects top speed. What if the German tests were with half a tank of Benzine and the Russian/UK/USA tests were with of full tank of there own grade of fuel? This would be a big difference. around 200kilos or 440lbs... Also is the aircraft clean and trimmed properly? Is the airframe bent from battle damage or crash landing?
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