I believe that this engine doesn't exists or it is the YF-75D.

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I've been reading a Chinese presentation at the IAC 2013 regarding the history of hydrogen/oxygen rocket engines in China and I have found no mention of the YF-50t.[1] Neither did I found it in any modern Long March 5 specification. The YF-75D is a closed cycle engine (albeit an expander) and is going to power the second stage of the Long March 5. So, may be the YF-50t was a project but the trades ended up with the YF-75D? I couldn't find any reference besides the Encyclopedia Astronautica article, which seems unsourced.— Preceding unsigned comment added by Baldusi (talkcontribs) 2015-07-09T00:36:08

  1. ^ Nan, Zhang (2013-09-23). "The Development of LOX/LH2 Engine in China" (pdf). 64rd International Astronautical Congress, Beijing, China. IAC-13-C4.1 (1x18525). International Astronautical Federation: 5. Retrieved 2015-07-02.{{cite journal}}: CS1 maint: date and year (link)