Curtiss P-40 Warhawk
The P-40 is described as an average fighter at best because of its handling and range. Prone to enter a spin when it stalled, and took several thousand feet to recover from steep dives. It could not out turn a Japanese Zero.

The P-40 is best known as the aircraft used by Claire Chennault's American Volunteer Group "The Flying Tigers". While not an outstanding fighter, it was well used during the first half of the war, until it was replaced by more capable types.

Merlin Powered P-40F
The P-40F was powered by a Rolls-Royce Merlin engine, only 603 were produced from January - August 1942.

Overseas Exports - Kittyhawk Mark IA (P-40E and P-40E-1
The P-40 "Kittyhawk" was the codename of the export version of the fighter, that was rejected by the RAF, but used by the RAAF and RNZAF in the Pacific. A total of 1,500 were exported between September 1941 - June 1942, and were counted under USAAF deliveries with USAAF serials. RAF s/n ET100-ET999, and EV100-EV699.

Production
Not counting the P-47 or the P-51, P-40s were the most extensively built US fighter, with almost 14,000 units being delivered before production ended in 1944.