I'm no P-38 expert, however I have no problems with flying it.
I rarely have a problem with the P-38 stalling although I fly it on the edge most of the tiime. Only three times since the beta of AH2 began have I ever had a flat spin. When they do happen there isn't much warning. Not even sure how I managed it, but a squad member watch me fall to earth straight down while the plane was still level.
Now sometimes in combat I may loose control for a moment or two, but those are not intentional. Just pushing the envelope a bit to hard. Over all I think the 38 flies much better in AH2, although the glass tail thing is a real disappointment. I killed another P-38 the other night, hit his left engine, scored hits on the inner sections of the the wing around the cockpit. Just before I did hit the cockpit, I watch the whole tail section fall off, and I didn't even put one round into it.
Kind of makes you wonder, just what does make the tail actually fall off!
