1937 Curtiss changed Allison V-1710-19 liquid cooled engine in a p36 fighter. The plane of the military project code is XP-40. The aircraft first flew successfully in October of the following year and reached a maximum speed of 587 km. In April 1939, the U.S. Army ordered the P-40A to start production and in a number of years have been changed out of type B and C. The P-40C (Hawk81 A-2) to increase the self sealing fuel tank based on type B, effectively improve the comprehensive protection of the fuel system. At the same time also increased the rack to Ground Weapons. Two weapons including a 12.7 mm machine gun and 4 wing was on a 7.62 mm gun. After the outbreak of World War II, the British government purchased a large number of military aircraft to the United States, including 930 type P-40C. These planes are called "Tomahawk" MK.IIB, and assigned to the Commonwealth Army Air Forces. The performance is not as good as the Lufftwaffe`s BF-109, the Commonwealth army's "Tomahawk" was mostly used as a fighter bomber. The British Royal Air Force 112nd FS is the first painted shark mouth pattern on the nose of the Allied forces. Under the command of captain Clif Caldwell with the total record of 28.5 aircraft( 22 on Tomahawk), As the Allied air forces in the North African theater of the first ACE. The box art is his fighter`s painting..