On the P40 series:
"... not an easy aircraft to fly properly and as a result, we lost a good number of pilots while training."
"In the first few months after conversion to Kittyhawks, all the squadrons lost heavily to the 109s."
"I found that one had to have a very strong right arm to fly the Kittyhawk I during most maneuvers. In dive-bombing, the aircraft would pick up speed very quickly in the dive, but it had a great tendency to roll to the right. One could trim this out reasonably well with the left hand, but even then when one pulled up, it wanted to roll to the left quite viloently. So I learned to trim about halfway in the dive and hold the control stick central by bracing my right elbow against my right leg and the right wall of the cockpit. It was also distracting to have one's left hand on the trim all the time, when it should be on the throttle."
"In a dogfight, with violent changes of speed, it was all one could do to fly the aircraft."
"Kittyhawk II... was a definite improvement in lateral stability over the Kitty I."
"Eventually, with the Mk IIIs, the Kittyhawk became a good, stable fighting aircraft, although it never did have enough power or climbing ability compared to the 109s or the Spitfire."