sevenperforce Posted November 4, 2022 Share Posted November 4, 2022 One thing that would be super nice would be if all of the entry points so far -- Cote d'Ivoire, the Maldives, Borneo, and now the Pacific Coast of Central America -- were along the same great arc. That would suggest that China designs the re-entry such that the vehicle is at least expected to come down within a single orbit. Unfortunately, those four points are not at all along the same great arc. Link to comment Share on other sites More sharing options...
steve9728 Posted November 4, 2022 Share Posted November 4, 2022 (edited) Do some research: CZ-5B Y1 was launched on 5 May 2020. And its wreckage was re-enter on13 May. 8 days. CZ-5B Y2 was launched on 29 April 2021. Wreckage was re-enter on 9 May. 10 days. CZ-5B Y3 was launched on 24 July 2022. Wreckage was re-enter on 31 July. 7 days. And this time was launched on 31 Oct. 2022, Wreckage was re-entered 4 days later. The first launch was a 21-ton test piece for Next-generation crewed spacecraft. The second was a 22.5t core module for the space station. I guess it was probably for the sake of safety that made the second one goes into orbit a bit higher resulting in it being two days later than the previous one. Then it turned out that it didn't need to be so conservative so there was a significant acceleration later. Edited November 4, 2022 by steve9728 Link to comment Share on other sites More sharing options...
sevenperforce Posted November 5, 2022 Share Posted November 5, 2022 This might be better placed in the regular Chinese space program spot, but I'm trying to figure out the minimum amount of work China would need to do to make this not happen again. If they simply added propulsive vents to the tanks and some basic star trackers to be able to maintain pointing, surely it would be able to use propulsive vents to point retrograde. Then firing additional propulsive vents should be enough dV to lower perigee, right? If the tanks are pressed to something on the order of 2 bar and the stage has 2% propellant residuals, how much dV would that provide if you just vent it all? Link to comment Share on other sites More sharing options...
mikegarrison Posted November 6, 2022 Share Posted November 6, 2022 On 11/5/2022 at 9:26 AM, sevenperforce said: I'm trying to figure out the minimum amount of work China would need to do to make this not happen again. First they would have to care, and apparently they don't. Link to comment Share on other sites More sharing options...
Vanamonde Posted November 7, 2022 Share Posted November 7, 2022 Since this issue is now resolved, please take any further discussion or similar situations to the main thread: Link to comment Share on other sites More sharing options...
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