Author Topic: Space Launch System (SLS) Q&A  (Read 16058 times)

Offline clongton

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Re: Space Launch System (SLS) Q&A
« Reply #40 on: 08/11/2017 12:18 PM »
  Seeing that Project Constellation was looking at 6 RS-68 engines for the core, which would have been less expensive and more powerful than RS-25, how did SLS get to looking at 4-6 RS-25 engines?
Was it merely ablative(RS-68) vs. regenerative nozzle(RS-25) cooling?

Thank you In Advance.

It was determined that the RS-68 would not survive the thermal environment of the proximity to the SRBs long enough to even reach MECO. Providing a regen nozzle for the RS-68 was not an option per USAF sources. Therefore the RS-68 was dropped from consideration and replaced with the RS-25, the next best option.
« Last Edit: 08/11/2017 12:19 PM by clongton »
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Offline whitelancer64

Re: Space Launch System (SLS) Q&A
« Reply #41 on: 12/05/2017 03:49 PM »
Is the Mobile Launcher Platform for the SLS called MLP-4?

*edit* it looks like it's called ML-1. Back to the old Apollo nomenclature, I guess.
« Last Edit: 12/06/2017 03:47 PM by whitelancer64 »
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Offline Hog

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Re: Space Launch System (SLS) Q&A
« Reply #42 on: 12/11/2017 05:39 PM »
Is there any Composite Overwrapped Pressure Vessels(COPV) used on SLS?
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Offline brickmack

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Re: Space Launch System (SLS) Q&A
« Reply #43 on: 12/11/2017 06:58 PM »
iCPS/DCSS uses a bunch of them for pressurant and attitude control propellant. EUS will use them as well, though its looking like they may go with IVF for those systems and only need a couple COPVs for storing high-pressure boiloff gas. AFAIK the core stage will use COPVs for pre-ignition tank pressurization as well, the same as on the Shuttle.

Offline Markstark

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Re: Space Launch System (SLS) Q&A
« Reply #44 on: 12/12/2017 02:08 AM »
Is there any Composite Overwrapped Pressure Vessels(COPV) used on SLS?
There are several COPVs in the Engine Section of the Core Stage. 5 big helium tanks used for pneumatic valve operations in flight. Some COPVs for hydraulic fluid used in the TVC system as well.


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