The YF-77 is China's most powerful cryogenic rocket engine using liquid hydrogen fuel and liquid oxygen oxidizer. Engine development began in the 2000s, with testing directed by the China National Space Administration (CNSA) commencing in 2005. The engine has been successfully tested by mid-2007.
^Chen, Minkang; Ru, Jiaxin (2007). 神箭凌霄 : 长征系列火箭的发展历程 [Divine Arrow Crosses the Sky: Development History of Long March Rocket Series] (in Simplified Chinese). Shanghai: Shanghai Science Technology and Education Press. ISBN7542841130. OCLC223362195.edit