Yuanzheng

Yuanzheng (Chinese: 远征; pinyin: Yuǎn Zhēng; lit.

'Expedition') is a restartable upper stage developed by the China Academy of Launch Vehicle Technology (CALT) for the Long March rocket family.

[3] Yuanzheng has a thrust of 6.5 kN (1,500 lbf) with a specific impulse of 315.5 seconds.

It uses the storable hypergolic propellants unsymmetrical dimethylhydrazine (UDMH) and dinitrogen tetroxide (N2O4), and can perform at least two burns within its rated life of 6.5 hours, sufficient to reach the transfer orbit apogee, and perform the circularization burn from there.

The debut flight of the Long March 7 in 2016 included an improved version called Yuanzheng-1A that can flexibly deploy multiple payloads into various target orbits.