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classified documents from Vickers-Supermarine
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It is the ones from Mtt that the RAE did not have access too. Germany was at war with England at the time so they were not exactly sharing information.
Instead, a pilot with little experience with a selectable pitch propeller had to go up and operate it to record data using a very difficult method of gathering airspeed data.
My Spitfire analysis is in agreement with the RAE's analysis.
The relative performance is not in agreement, but that has to do with Bf-109 performance and not the Spitfire's.