1937年,美国柯蒂斯公司的P-36战斗机经过一番周折,终于得到军方210架的订货。为提高性能,P-36A第10号生产机改装了一台艾利逊液冷发动机,它被称为X P-40(也称为H awk81)。在1938年10月试飞时,其时速比P-36快70千米!次年5月,P-40被美国选中,成为订货量最大的战斗机,最初生产的20 In 1937, the United States Curtiss P-36 fighter after some twists and turns, and finally get 210 military orders. To improve performance, the P-36A Production Unit 10 was retrofitted with an Allison liquid-cooled engine, called X P-40 (also known as H awk81). When it was flown in October 1938, its speed was 70 km / h faster than the P-36. In May the following year, the P-40 was selected by the United States as the fighter with the largest order volume. The original production of 20