Here..LEO load to launch wt ratio: CZ-5dy--(70:2211) > CZ-9b--(50:1964)
Replying to: CZ-5 and 921 are not exactly the same rocket -- motif	Post Reply Forum

InTheNameOfJesus

07/17/2021, 20:09:13

Author Profile | Edit

YF100 is the booster engine of the original CZ-5. 2680 tons thrust means at lift off, about 20 YF100s(@120 tons each) are ignited during CZ-5DY liftoff. Something fishy that it says the 1st stage has 7 YF100: just how do the 2 boosters share the remainder 13 YF100s ?.

...........

OK,u're rite that the CZ-9 will use the later 500 tons kerosene/LO engine and the CZ-9b 1st stage will use 5 of them. Mind u these engines have hier specific impulse than the YF-100 and why does the CZ-9b have lower LEO load to lift-off mass ratio?

Uploaded file

cz5dy.PNG(663.9 KB) cz9b.PNG(257.0 KB)

Recommend | Alert |

Followups

They're not the same rocket, is that a surprise? [no text] - motif 07-17 20:55 | 0 bytes | +1
- They use the same fuel combo;why hier specific impulse=>less payload? - InTheNameOfJesus 07-18 11:54 | 161 bytes | +1
  - Pls, payload is determined by lift off thrust, specific impulse measure engine - motif 07-18 14:21 | 11 bytes | +1
    - Pls,U don't hav the basics1)Payload:takeoff WT ratio depends on a no.of factors - InTheNameOfJesus 07-19 10:36 | 1163 bytes | +1
      - Take a look at Falcon 9 (24:770) > Delta 4 Heavy (29:961) - motif 07-19 20:53 | 247 bytes | +1
        
        Where did u get the'961'from'Delta 4 Heavy (29:961)'? - InTheNameOfJesus 07-20 06:38 | 259 bytes | +1
        
        Both figure lift off thrust - motif 07-20 22:03 | 93 bytes | +1
        
        U missed a no.of important things.Ur'Payload:thrust'ratio also overlook many - InTheNameOfJesus 07-21 17:24 | 7285 bytes | link +1
        
        The same apply to your comparison of 921 to CZ-9B - motif 07-21 20:54 | 450 bytes | +1
        
        If I missed something bcos they're not there in the'leaked infos',as u said - InTheNameOfJesus 07-22 13:32 | 393 bytes |