Hi Oxman,
>I was wonderin' , how did the 40 fair against the IJN A/C.
From what I've heard from MF Kirby (who flew P-39, or rather P-400) and Clay Tice (who flew P-40), both of them in New Guinea, the USAAF fighters were outclassed in that theatre.
The P-400 had a poor ceiling, and the Japanese bombers, escorted by radial-engined fighters, could attack at altitudes above the P-400's ceiling. Kirby said he was glad the Japanese fighters didn't come down to fight, for obvious reasons. Kirby and Clay seemed to agree that the was a bit better with regard to the ceiling, but fairly equal otherwise.
The main strength of the USAAF fighters was top speed, and they seem to have employed hit-and-run-for-home tactics. Their margin of superiority was pretty small, and the Japanese fighters held all of the other advantages.
Pilots on New Guinea were desperate to get their hands on newer, better fighters, and Jack Welsh is reported to have bailed out of his P-40s routinely for "engine trouble" after someone told him that they'd get new fighters as soon as they'd used up their remaining P-40 fighters. The story might not be true, but Clay considered it credible, so I think it caught the atmosphere among the pilots at least.
Both Kirby's and Clay's unit received the P-38 at last, and from that moment on, they felt that they enjoyed technological superiority over the Japanese fighters. (Kirby became an ace on P-38s.)
(Kirby said he didn't meet the Ki-61 in combat, though it was employed in New Guinea at that time. It's my impression he only met radial engined fighters.)
Regards,
Henning (HoHun)