All Aero

The I-1 led to several further developments epitomized by the I-3U (1-380) fighter-bomber beaten by the Su-22, and the I-3P (with an unknown alternative designation in the I-¬380 series) radar-equipped interceptor beaten by the Su-9. The I-3 series of fighter-bomber prototypes were powered by the 18,518-lb (8400-kg) thrust Klimov VK-3 turbojet and had about double the empty weight of the initial MiG-21 variants.