The below flight test was performed on Switzerland`s Bf 109E-3, WNr. 2404, designated 'J-347' in Swiss service. It was powered by a DB 601Aa engine, WNr. 10 912. The aircraft was delivered on 16 October 1939. On 4 November 1941, the aircraft was flight tested with Escher-Wyss propellers and compared to the performance with it's original VDM propeller. At the start of the test, the aircraft had already flown 111 hours and 16 minutes.
J-347 was declared unfit for service on 20 November 1946, after 324 hours and 29 minutes of flying time.
Bf 109E-3, WNr. 2404, 'J-347' in Dübendorf, during the winter of 1939/1940, shortly after it`s delivery to Switzerland. (via Philippe Osché)
The German text on the top translates :
Full-throttle, level flight speeds.
Flown with the aircraft Me 109/J-347
Engine : DB 601 Aa, serial no. 10912.
Comparison of the avarage values.
Unfortunately, little more detail is known about the test itself. However, some observations can be made regarding the results.
Unfortunately, more details of this test is not known at present. If you have additional information or parts of this report, please contact me.