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J-6II High Altitude Fighter

In order to deal with the harassment of high-altitude unmanned reconnaissance aircraft, and to effectively intercept and destroy U-2 high-altitude reconnaissance aircraft, the Air Force requires that the static ceiling of the J-6 aircraft be increased on the basis of the already improved J-6I aircraft, and then further improved. On May 20, 1968, the factory production headquarters issued a notice, deciding to develop the F-6II on the basis of the F-6I. In order to accomplish this task, the 112 factory added Hou Youku, Xu Dianju and other 7 members on the basis of the modification team of the flight test workshop. At this time, it was called the J-6 modification team. Cao Yixiang and Mao Yilian are in charge, and the test flight team cooperates. The Air Force First Research Institute sent two technicians to participate.

For the purpose of further increasing the ceiling, the F-6? further increased the wing area on the basis of the Type I; the spoiler, universal beam, camera gun, flare gun, bulletproof steel plate, engine protection plate, 9 Box oxygen cylinders, etc.

In addition, the aircraft has also improved the air intake system, adding an adjustable shock cone to the air intake of the F-6 to improve the intake efficiency under high-speed conditions and reduce drag. At the same time, the radius of the intake lip is reduced, and 8 auxiliary intake valves are added. As early as when Dongfeng 102 was trial-produced by Factory 112, a fixed central shock cone was installed for the F-6 aircraft. At that time Soviet experts were very supportive. However, Soviet experts don’t know how to design the central shock cone, but they apparently have seen MiG-21 aircraft with shock cones in the air inlet in the Soviet Union, and therefore support this improvement. On the basis of the Dongfeng 102 trial-manufactured flight test experience, the 112 factory designers designed a new adjustable shock cone for the F-6II aircraft.

While taking weight reduction measures for the F-6II, in order to compensate for the lack of firepower caused by the original F-6I only retaining a 30mm fuselage gun, a 23mm gun was installed on the left side of the fuselage.

After 7 months of intense work, the remodeling was completed 5 days in advance as planned. On March 25, 1969, the first F-6II aircraft No. 3301 successfully flew by Ye Guangrong. In August, the first J-6II went to Beijing Nanyuan Airport for a performance, and the central leadership gave it high praise. The two F-6IIs produced were all delivered to the 24th division in September 1969.

The J-6II successfully flew for the first time in 1969 with a Mach number of 1.44 and a ceiling of 19,500 meters. However, the aircraft has not been designed and finalized due to the problem of excessively high temperature of the tail cover during the flight. In addition, the United States stopped bombing northern Vietnam in 1968. By 1969, the activities of the U.S. "Firebee" high-altitude unmanned reconnaissance aircraft were also coming to an end. At the end of 1969, the U.S. military basically stopped using reconnaissance aircraft to survey the southwest border of my country. The J-6II, designed for high-altitude reconnaissance aircraft such as the Firebee and U-2, was not put into mass production.