Re: Kawasaki Ki-61 - Ha40 vs DB601
Maybe the difficulty for Japanese was that it was their first in-line engine.
From my recents reads about Guadalcanal, it seems that in 1942 far more US aircraft were lost to engine failure than Japanese ones, despite the Japanese ones flying far longuer missions. So at least in the first part of the war, engine quality seem not to be an issue for Japan.
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