Kawasaki Ki-61 - Ha40 vs DB601

[bearoutwest]

Hi Laurent,
Not intending to re-write history as to why the DB601 wasn't used. I'm happy to accept history as it was.

The intent of my question is more to explore the differences between the Ha40 and the DB601, as manufactured; and to understand how much of a difference this might/would have made to the performance of the Ki-61 Hein.

Thanks for starting the ball rolling.

...geoff