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DF 105 / MiG-19PM / F-6B (all-weather missile)

The Air Force proposed that a large number of fighter jets were needed at that time, in order to quickly meet the needs of the replacement of the troops, with the help of the 112 Factory and the 410 Factory, around November 1958, the 320 Factory and the 331 Factory also began to manufacture MiG-19P aircraft and engines. Imitation. On February 24, 1959, the aircraft copied from the 320 factory flew for the first time; on April 20, the engine copied from the 331 factory passed the 100-hour long-term test run and started small batch production.

On March 21, 1959, the First Machinery Department and the Fourth Bureau sent a telegram to Factory 320: "In order to appropriately reduce the types of aircraft produced by Factory 112 and maintain the mission of Factory 320 to continue to produce jet supersonic fighters, it was decided to replace the MiG-19PM aircraft with The imitation task and batch production task were changed to the 320 factory, and the trial production was completed at the end of this year, and the batch production was transferred to batch production in 1960.” On April 18 of the same year, the Fourth Bureau decided to use the original data and 5 parts and finished products of the model. The 112 factory was completely transferred to the 320 factory.

The 320 factory has some experience in trial production of the MiG-19P. The MiG-19PM has 87% of the same parts and components as the MiG-19P, and the trial production will soon begin. In September 1960, it entered the component assembly stage. The imitation MiG-19PM is called Dongfeng 105.

Due to the general decline in the quality of aviation products at that time, a comprehensive quality rectification began at the end of 1960, and the final assembly and flight test were not continued. In 1963, the first MiG-19PM was successfully tested, and by 1966, 19 were delivered. On June 30, 1967, the Ministry of Three Machines formally notified the 320 factory that the MiG-19PM aircraft had been discussed and approved by the Military Commission to stop production and submitted to Chairman Mao for approval. The backlog of parts to be installed was approved to be scrapped.

The J-6B is actually the MiG-19PM imitated by Nanchang Aircraft Factory. Except for the four fixed hanging beams under the wing, the aircraft has almost no difference in appearance from the J-6A. Therefore, there are also articles that consider the aircraft as the latter, and claim that the J-6 A can mount 4 "Thunderbolt-1" missiles. But in fact, the RP-1 radar equipped with the J-6A can only be used with the ASP-5NM optical sight for aerial gun shooting, and cannot be used to guide the K-5M missile.

It is mentioned that the imitation of MiG-19PM by Nanchang Aircraft Factory started in November 1958 (one said it was August 58). At that time, Nanchang Aircraft Factory was preparing to imitate MiG-19P and MiG-19PM, and hoped to realize the leap from a propeller aircraft manufacturer to a jet aircraft manufacturer through the imitation work. On September 28, 1959, Nanchang successfully imitated the MiG-19P, passed the national appraisal on November 28, and then produced 7 aircraft. In March 1959, the Nanchang Aircraft Factory imitated the MiG-19PM (called Dongfeng 105 at the time, then named 59B for a short time, until it was uniformly named the J-6B in 1964) according to the drawings and materials provided by the Soviet Union. It can also be judged that China later purchased additional production licenses for MiG-19PM. In 1963, the first MiG-19PM passed the flight test, and 19 had since been built.

At the beginning of 1958, due to blind optimism at the time, it was hurriedly decided to stop the production of MiG-17F, so MiG-17F was completely discontinued in the second half of 1959. However, the long-term failure of the MiG-19 to be delivered to the troops made the Air Force unable to obtain new fighters for nearly two years, and the equipment plan was frustrated. In 1960, the number of combat aircrafts fell by 12% compared with 1959, and normal training could not be carried out. It was very unfavorable for combat readiness. In addition, after the bombardment of Kinmen began in the second half of 1958, the combat readiness situation was tight, the air force's combat duty and training missions increased sharply, and the level of equipment damage became more and more serious.

The Kuomintang Air Force was equipped with a new F-100 fighter jet. Chiang Kai-shek clamored to "counterattack the mainland," and the situation was very tense. The Air Force reported to the Central Committee that the new aircraft could not be delivered, and the spare parts were not available, the old aircraft were dead and there were no aircraft to deal with the enemy. Due to a serious shortage of spare parts, a large number of aircraft were grounded, forcing the Air Force to decide in September 1960 to shorten the pilot training time to extend the use time of the engine. Among them, the largest compression was only 1/35 of the prescribed training flight time, which seriously affected Improve the combat effectiveness of the troops. On the other hand, the activities of the Kuomintang Air Force’s high-speed reconnaissance aircraft had become increasingly rampant.

The J-6B with the aircraft number 14121 collected in the Chinese Aviation Museum has two obvious differences from the standard MiG-19PM in appearance: the wing root retains two aircraft cannons, and the corresponding positions on both sides of the fuselage are equipped with defenses. Flame plate; the deceleration parachute is moved up to the root of the vertical tail.

It is the deceleration parachute that aroused my suspicion. Although it is only moved from the belly to the root of the vertical tail, it is the result of long-term experience accumulation-this movement changes the parachute moment from the bow moment to the nose up moment, so that the aircraft can be in the situation where the nose gear is not touching the ground. Lower the umbrella to greatly shorten the running distance. However, the Chinese Air Force only began to equip the MiG-19 in September 1958. It has not been equipped with an aircraft with a deceleration parachute before. It is impossible to have such experience accumulation and issue requests for improvement in such a short time. The aforementioned Dongfeng 102 was designed almost at the same time as the F-6B imitation. However, in this model that emphasizes self-centered and improved design, no changes to the deceleration parachute can be seen. After that, it was not until the J-6III that was designed in 1968 that the improved design of the deceleration parachute was seen again (the later-produced J-6 also adopted this improvement).

The No. 14121 aircraft is probably not a real J-6B, but a new J-6A produced in Guizhou. This can explain why the wing-rooted cannon and the reduction parachute cabin improvements that are only available in the late J-6 model.