The Ki-61 'Men' (Flying Swallow) was the only inline-engined (liquid-cooled) monoplane fighter to be used operationally by the Japanese armed forces during World War 2, and when first encountered by Allied pilots was presumed to be of German origin rather than a homegrown machine. The Ki-61 was committed in quantity to the fighting over New Guinea but was plagued by engine problems, which together with other factors, and despite the valiant efforts...
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