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1944年5月19日,首架Il-1开始试飞,速度达到579千米/小时。考虑到Il-1那身厚实的装甲,能够达到这样的速度已经难能可贵了。试飞表明Il-1的速度和加速性能同德国战斗机相差不大,但是水平机动能力同FW 190相比仍有差距,且火力不如德国战斗机。其实早在这次试飞之前,伊留申就已经意识到Il-1前途渺茫。因为1944年4、5月后,苏联已经逐渐掌握战场上的制空权,大批高性能战斗机补充到部队,像Il-1这种半路出家的重装甲战斗机实在没有存在的必要。而且伊留申对重装甲战斗机的思路也一直很不理解。走到这一步,他干脆提出因为Il-1在战场上已经没有适合的任务,且结构复杂,所以
May 19, 1944, the first Il-1 began a test flight at a speed of 579 km / h. Taking into account the Il-1 thick armor, to achieve such a rate has been commendable. Flight tests showed that Il-1's speed and acceleration performance were similar to that of German fighters, but there was still a gap between the horizontal mobility and FW 190 and the firepower was not as good as that of German fighter aircraft. In fact, long before the test flight, Ilyushin realized that the future of Il-1 was slim. Because in April and May 1944, the Soviet Union had gradually mastered the air superiority on the battlefield and a large number of high-performance fighter jets were added to the troops. There was no such need for a semi-armored heavy armor fighter like Il-1. And Ilyushin's idea of heavy armored fighters has also been very poorly understood. At this stage, he simply put forward that because the Il-1 has no suitable task on the battlefield and the structure is complex,