Japanese aircraft were behind in timing to Allied aircraft.

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And I'm bringing it back to the P-39. Where it should be.
Alright...now you've done it.

Go sit in the lobby and wait - someone will be with you shortly...

V1 and V2 were powered by a BMW139, which had overheating problems.
It was V5 (there was no V3 or V4) that was powered by the BMW801, that had the annular radiator and cooling intake system that production Fw190s used.

V1 first flew in summer 1939, V5 first flew in spring 1940 - so it didn't take very long.
The early production models still had serious problems with overheating and engine fires. It wasn't until extra cooling slots were added for the A-2 that the problems were addressed.

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