The P-40 was originally conceived as a pursuit aircraft and was very agile at low and medium altitudes but suffered due to lack of power at higher altitudes. At medium and high speeds it was one of the tightest turning early monoplane designs of the war, and it could out turn most opponents it faced in North Africa and the Russian Front. In the Pacific Theater, like all Allied Fighters it was out turned at lower speeds by the lightweight fighters A6M Zero and Nakajima Ki-43 "Oscar" which did not possess the structural strength of the P-40 for high speed hard turns. The American Volunteer Group Commander Claire Chennault advised against prolonged dog fighting with the Japanese fighters due to the resulting airspeed reduction which favored the lightweight Japanese designs' low speed turning superiority.
Allison V-1710 engines produced about 1,040 hp (780 kW) at sea level and at 14,000 ft (4,300 m): not powerful by the standards of the time and the early P-40 variants' top speeds were only average. Also, the single-stage, single-speed supercharger meant that the P-40 could not compete with contemporary designs as a high-altitude fighter. Later versions, with 1,200 hp (890 kW) Allisons or more powerful 1,400 hp Packard Merlin engines were more capable. Climb performance was fair to poor, depending on the subtype. Dive acceleration was good and dive speed was excellent. The highest-scoring P-40 ace, Clive Caldwell (RAAF), who claimed 22 of his 28½ kills in the type, said that the P-40 had "almost no vices", although "it was a little difficult to control in terminal velocity". Caldwell added that the P-40 was "faster downhill than almost any other aeroplane with a propeller." The P-40 had one of the fastest maximum dive speeds of any fighter of the early war period and good high speed handling.
The P-40 tolerated harsh conditions in the widest possible variety of climates. It was a semi-modular design and thus easy to maintain in the field. It lacked innovations of the time, such as boosted ailerons or automatic leading edge slats, but it had a strong structure including a five-spar wing, which enabled P-40s to pull high G turns and even survive some midair collisions: both accidental impacts and intentional ramming attacks against enemy aircraft were occasionally recorded as victories by the Desert Air Force and Soviet Air Forces. Caldwell said P-40s "would take a tremendous amount of punishment, violent aerobatics as well as enemy action."Operational range was good by early war standards, and was almost double that of the Supermarine Spitfire or Messerschmitt Bf 109, although it was inferior to the Mitsubishi A6M Zero, Nakajima Ki-43 and Lockheed P-38 Lightning.
A little bit of information about the P-40