Nice shots!
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I think there were some four Beaus squadrons in the USAAF.The USAAF operated two (I think...haven't checked) squadrons of Beaufighters as night fighters in the MTO.
....and now I see Sea Hurricane Mk.XIIs with stars during Operation Torch. a thunk
The R-1 three years younger? I don't think so. As per this source the R-1 design started in 1936 and the first fly on 1940 by the spring.The Zmaj R-1 is 3 years "younger" than Do-17. So perhaps the Do-17 was quite similar to R-1.
Where did you get that info that it was designed in 1930? By that date it would had been a very modern design, if not the most. Quite a far achivement for such a small country as Yugoslavia.The R-1 was designed in 1930 and it seems it stayed unrealized for the next six years. Then in 1936 they started its construction at the Zmaj factory. The Dornier project that resulted in the Do-17, started in 1933 as memo serves. So it means that the R-1 was born three years earlier.
Sorry but the first web says "The Zmaj R-1 was a twin-engined prototype bomber from Yugoslavia, designed in the 1930s.", not in 1930.