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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 ( talk • contribs) 2015-07-09T00:36:08