第二次世界大战前,航空技术的飞速发展,让各国的空中力量也有了很大的进步。不仅是战斗机,轰炸机等其他作战机种也产生了巨大的变化。20世纪30年代,收放式起落架、机组人员的气密座舱、机舱内置炸弹、悬臂式下单翼布局等新技术开始在轰炸机上得到了应用。尤其是空气动力学的发展,使得机体的线型更加合理。再加上发动机功率的提高,金属材料、工艺的进步,使轰炸机等作战飞机的各项性能均有大幅度的提高。 Before the Second World War, the rapid development of aviation technology made great strides in the air power of all countries. Not only fighter planes, bombers and other combat aircraft have also undergone tremendous changes. In the 1930s, new technologies such as retractable landing gear, crew airtight cockpits, cabin built-in bombs, and cantilevered lower wing configurations began to be applied to bomber aircraft. In particular, the development of aerodynamics, making the body’s line more reasonable. Coupled with the increase in engine power, metal materials, process improvements, so that the performance of combat aircraft such as bombers have greatly improved.