There are some fighters which were initially designated by some sources as Dong-Feng fighters: the Shenyang J-6 MiG-19PF and MiG-19SF were also known as Type-59 and later called Dong Feng 102 (DF-102). This initial Dong Feng fighter was followed by two other East Wind fighters based on the MiG-19: A MiG-19PF derivative with a limited all-weather capability was called Dong Feng 103 but also known as Type 59A and the MiG-19PM all weather version, which was build by Nanchang. Its initial designation was Dong Feng 105 or otherwise Type 59B.
The first real indigenous East Wind series fighter was the DF-104 and seems to have been under development in between the DF-103 and DF-105 MiG-19 derivates. Not much is known about this project only that it remained a real “paper project”, which was designed by the Shenyang Aircraft Factory (not the Shenyang-based 601 Aircraft Design Institute) with Soviet help but not as a copy of a Soviet design. The DF-104 was designed as a Mach 1,4 capable fighter using design elements of the latest fighters and it could be assumed that it was to be powered by two maybe up-rated WP-6 turbojet engines as used by the J-6 and Q-5. Its development started about the end of 1957 or beginning of 1958 only to be given up in favour of an enlarged version of the DF-104 called DF-107 a few months later.
This design was suggested when the Aviation Industry Control Section insisted early in 1958 on much higher performance especially for a top speed of Mach 1,8 at a service ceiling of 20.000 m. The design of the DF-104 started in 1958 and already some form of prototype construction had begun in May 1959, when only one month later the concept needed some significant modifications.
Of the many novel technology used for the DF-107 was a variable angle of attack wing design similar to the F-8 Crusader or some of the Mikoyan Ye-series fighter prototypes. Otherwise this fighter closely resembles a twin engined Starfighter fuselage with a standard tail and sharply ranked wings. The two engines were to be fed by two lateral air intakes and seem to have been much improved and up-rated engines derived from the WP-6 called “Hong Qui-2” (“Red Flag-2”). This was the second indigenous turbojet designed by the Shenyang Aeroengine Design Office (SADO) following the initial success of the PF-1A developed for the JJ-1. Even after early ground test runs seem to have been successful or at least quite promising, it was once again decided to stop all development work on the engine and the fighter itself from November 1859 on and to develop another engine called “Type-814” for the next project the DF-113.
Source: China Today - Aviation Industry, 1989, Beijing