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That's what was mentioned in my initial post of a gap for 29 years.......... instead of your claim of 40 years By the way can you elaborate on the differences between the cryogenic engines of both nations which must have been possible in the two decade gap

The same wikipedia page which you cited says the first firing happened in 1987 Secondly we had a working engine in the last decade..... so the gap is only about a decade

At the cost of repeating myself, this is only 29 years and not 40 years as you had stated earlier........ secondly, if you make an assertion be ready to defend it even if it means repitition

Hi, new to this forum.......... but would like to understand, if YF77 was the first cryogenic engine for China..... how can it be 40 years old technology for China