CZ-5 and 921 are not exactly the same rocket Replying to: CZ-5DY has hier payload to launch mass ratio than CZ-5B though the latter -- InTheNameOfJesus Post ReplyForum motif 07/17/2021, 19:46:09 Author Profile | Edit CZ-5 first stage in core use only two 50 ton YF-77, while the three core stages in 921 each use 7 thrust vector YF-100K of 130 ton thrust. YF-100K is derived from the CZ-5 booster's YF-100 non-thrust vector engine of 120 ton. So the four boosters of CZ-5 use 4 x 2 YF-100 engine, 921's 3 core stage use 3 x 7 YF-100K engine. Although Long Lehao dubbed 921 lunar version as CZ-5DY, 921 may actually gained its own designation, perhaps CZ-10. Recommend | Alert | 5 4 3 2 1 0 -1 -2 -3 -4 -5 Where am IGo Up Go TopPost ReplyBack

Followups