comparsion EZ42 vs G.G.S.

[Draken152]

Hi all,
I have found this text on wikipedia: ,,
The EZ 42 was compared with the Allied G.G.S. captured from in a P-47 Thunderbolt in September 1944 in Germany. Both sights were tested in the same Fw 190, and by the same pilot. The conclusion was critical of the moving graticule of the G.G.S., which could be obscured by the target. Compared to the EZ 42, the Allied sight's prediction angle was found on average to be 20% less accurate, and vary by 1% per degree. Tracking accuracy with the G.G.S. measured as the mean error of the best 50% of pictures was 20% worse than with the EZ 42."

Has anybody origin of this information? It is book (Hahn, Fritz. Deutsche Geheimwaffen 1939-1945. Flugzeugbewaffungen. Heidenheim: Erich Hoffmann Verlag, 1963) or better scan of original germany review? Or any clues about this information?

 

[Greyman]

Came across what seems to be the original document - or at least another step towards the original document. It's a report on 'German Airborne Gun and Rocket Sights' based on interrogation of German personnel, 17 Jul to 21 Aug, 1945.



5.4 . Methods outlined in 5.1 were used to compare the EZ.42 with a G.G.S. captured in a Thunderbolt in September 1944. Both sights were tested in the same F.W.190 with the same pilot, comments were:-

(a) Six spots in the G.G.S. moving graticule were inadequate (the EZ.42 has a nearly continuous ring).
(b) The centre spot in the G.G.S. moving graticule obscured the target at long range.
(c) Prediction angle of the G.G.S. varied by 1% per degree C.
(d) The prediction angle produced by the G.G.S. was on the average 20% less accurate than that of the EZ.42.
(e) Tracking accuracy of the G.G.S. measured as the mean error of the best 50% pictures, was 20% worse than with the EZ.42.
​

5.5 . It is considered by the RAE that their method of assessing the correct angle off by comparison of silhouettes is liable to considerable inaccuracy. In addition their knowledge of the ballistics of U.S. 50 calibre ammunition was not accurate in their own admission. These points ... (rest of section missing)