1975年,当前苏联的一种新型攻击机苏-25第一次通过鉴定时,西方的观察家们对此感到万分惊讶,因为大后掠角三角翼是俄罗斯战斗机经常采用的气动布局。例如,苏霍伊设计局具有代表性的苏-7/17“装配匠”系列,苏-9和苏-15等。之所以要研制苏-25,是因美国基本上在同一时期正在开发近距空中支援飞机A-X(A-10A“雷电”Ⅱ就出自于此)。为了抗衡A-X,前苏联开始设计一种结构简单、坚固耐用、性能可靠的攻击机,这种攻击机 In 1975, Western observers were greatly surprised when the new Soviet attacker SU-25 first passed the appraisal, because the large sweep angle delta wing is a frequently used aerodynamic layout by Russian fighter jets. For example, Sukhoi Design Bureau representative Su-7/17 “Assembly Carpenter ” series, Su-9 and Su-15 and so on. The reason for developing the Su-25 is that the United States is developing a near-air-support aircraft, A-X, basically from the same period (from which the A-10A and Thunderbolt II came out). In order to counter the A-X, the Soviet Union began to design a simple structure, durable, reliable performance attack aircraft, this attack aircraft