The Shenyang JJ-1, also known as the Hong Zhuan-503 or Red Special, was a jet trainer developed in the People's Republic of China (PRC) during the 1950s.

To ensure that the People's Liberation Army Air Force could re-equip and train to fly jet fighters Shenyang Aircraft Corporation were approached by the PLAAF to design and build a prototype jet trainer.

Most team members were recent university graduates, and only three people: Xu, Huang, and Lu Xiaopeng, had any aircraft design experience.

[1][3] Power was supplied by a Shenyang Aircraft Development Office PF-1A, (Chinese copy of the Klimov RD-500 itself a copy of the Rolls-Royce Derwent), centrifugal compressor turbojet fitted in the centre fuselage, exhausting through a jet pipe extending to the tail of the fuselage.

[3] Data from International Resin Modellers,[3] Chinese Aircraft: China's aviation industry since 1951[1]General characteristics Performance Armament 1x 23 mm (0.91 in) automatic cannon