In the mid-’70s, China managed to get their hands onto Egyptian MiG-23BNs and -MSs, and downed American F-111s. Using this captured technology, Nanchang was asked to develop a swing-wing strike aircraft for the PLAAF. Originally, plans centered around a quick domestic copy of the MiG-23BN. However, when PLAAF requirements added air-to-air capabilities, the MiG-23BN would prove inadequate. Plans then shifted to repurposing the F-111 electronics for the new design. Chinese industry proved incapable of producing systems as small as the design called for, forcing a major redesign that made the Q-6 comparable in size to the Su-24. The side intakes of the MiG-23 proved inadequate for dogfighting, so they were relocated to the chin, while the inadequate engine was to be replaced with the domestically-produced WS-6 turbofan. Overall, however, the project quickly proved to be beyond the means of the Chinese aerospace industry. Development dragged on as much of the intended onboard systems proved too difficult to copy. While an advanced fly-by-wire system (first of its kind for China) was developed for the Q-6’s swing wings, it proved to be 12% heavier than the one employed on the MiG-23. The WS-6 proved to be failure as well, and thus, in 1989, with requirements shifting away from swing-wing designs, the Q-6 was finally cancelled.