Author Topic: SLS Development Stage UPDATE Thread (2)  (Read 392411 times)

Offline Chris Bergin

Re: SLS Development Stage UPDATE Thread (2)
« Reply #860 on: 11/09/2017 02:07 AM »
Article on the official announcement via the internal rallying memos going around (via L2):

https://www.nasaspaceflight.com/2017/11/sls-managers-troops-slip-2020/

Offline FutureSpaceTourist

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #861 on: 11/16/2017 06:32 PM »
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Orbital ATK technicians put final touches on @NASA_SLS boosters’ aft exit cones as we continue to prepare for the vehicle’s EM-1 mission!

https://twitter.com/orbitalatk/status/931241992327229440

Offline ncb1397

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #862 on: 11/22/2017 06:17 PM »
Space Flight Insider video on LVSA and OSA components of SLS.


Offline Steven Pietrobon

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #863 on: 11/24/2017 05:56 AM »
Here's the next part talking engine the SLS Engine Section.

Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Chris Bergin

Re: SLS Development Stage UPDATE Thread (2)
« Reply #864 on: 11/30/2017 01:44 PM »
MAF simulating SLS engine installation with RS-25 pathfinder
https://www.nasaspaceflight.com/2017/11/maf-engine-installation-rs-25-pathfinder/
« Last Edit: 11/30/2017 01:44 PM by Chris Bergin »

Offline Eric Hedman

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #865 on: 11/30/2017 02:22 PM »
Here are some videos of NASA people visiting a contractor (Weldall in Waukesha, Wisconsin) building test equipment for SLS:

https://www.youtube.com/watch?v=IGhcg2Qle04&feature=youtu.be

https://www.youtube.com/watch?v=-7f04exu4sE&feature=youtu.be

Offline deruch

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #866 on: 11/30/2017 05:49 PM »
Here's the next part talking engine the SLS Engine Section.


Part 3 of the SFI Marshall tour, looking at the the structural test stands for the LOX and Hydrogen tanks:


« Last Edit: 11/30/2017 05:50 PM by deruch »
Shouldn't reality posts be in "Advanced concepts"?  --Nomadd

Offline FutureSpaceTourist

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #867 on: 12/05/2017 06:41 PM »
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Final assembly and transportation crew pose with the 10th @NASA_SLS booster segment as it goes into storage, completing a full flight set of solid rocket boosters!

https://twitter.com/orbitalatk/status/938101017966776320

Offline AncientU

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #868 on: 12/05/2017 10:44 PM »
So, has it been determined what is the shelf-life of a new booster?
These need to sit for 3-4 years, the next ones being built for possibly twice that.
"If we shared everything [we are working on] people would think we are insane!"
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Offline ncb1397

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #869 on: 12/05/2017 11:22 PM »
So, has it been determined what is the shelf-life of a new booster?
These need to sit for 3-4 years, the next ones being built for possibly twice that.

I don't know. The ICBMs and Ground Based Interceptors sit for a long time though. It is probably like canned food. After 100 years, you could probably eat it and be fine, but you wouldn't want to.
« Last Edit: 12/05/2017 11:49 PM by ncb1397 »

Offline JAFO

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #870 on: 12/06/2017 05:57 AM »
So, has it been determined what is the shelf-life of a new booster?
These need to sit for 3-4 years, the next ones being built for possibly twice that.

I don't know. The ICBMs and Ground Based Interceptors sit for a long time though. It is probably like canned food. After 100 years, you could probably eat it and be fine, but you wouldn't want to.

Must be some kind of date, wasn't the Ares I-X made up of expired 4 segment sections?
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Offline AnalogMan

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #871 on: 12/06/2017 11:38 AM »
So, has it been determined what is the shelf-life of a new booster?
These need to sit for 3-4 years, the next ones being built for possibly twice that.

I don't know. The ICBMs and Ground Based Interceptors sit for a long time though. It is probably like canned food. After 100 years, you could probably eat it and be fine, but you wouldn't want to.

Must be some kind of date, wasn't the Ares I-X made up of expired 4 segment sections?

Originally shuttle RSRMs had a 5-year certified service life.  From ST-117 onwards that was extended to 5.5 years for already built motors.

The materials in the motor (or chemically similar materials) are used in rocket systems certified for 20+ years.  A shuttle flight verification motor (FVM-2) aged 7.2 years was test fired by ATK in May 2008 for life validation purposes.

Other limiting time requirements were: 1-year maximum stacked life, and 180 days max on pad.

Up to 39-year old Minuteman motors (which use similar materials) have been successfully static test fired.

Offline envy887

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #872 on: 12/11/2017 05:17 PM »
So, has it been determined what is the shelf-life of a new booster?
These need to sit for 3-4 years, the next ones being built for possibly twice that.

I don't know. The ICBMs and Ground Based Interceptors sit for a long time though. It is probably like canned food. After 100 years, you could probably eat it and be fine, but you wouldn't want to.

Must be some kind of date, wasn't the Ares I-X made up of expired 4 segment sections?

Originally shuttle RSRMs had a 5-year certified service life.  From ST-117 onwards that was extended to 5.5 years for already built motors.

The materials in the motor (or chemically similar materials) are used in rocket systems certified for 20+ years.  A shuttle flight verification motor (FVM-2) aged 7.2 years was test fired by ATK in May 2008 for life validation purposes.

Other limiting time requirements were: 1-year maximum stacked life, and 180 days max on pad.

Up to 39-year old Minuteman motors (which use similar materials) have been successfully static test fired.

I thought Minuteman used HTPB instead of PBAN in current SLS/STS motors?

Offline Hog

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #873 on: 12/11/2017 06:34 PM »
Space Shuttle solid-rocket booster Thiokol AP/PBAN/Al ca. 245 11-point star and tapered perforations 1981


Minuteman I
Stage 1 Thiokol AP/PBAA/Al ca. 245 6-point star 1962
Stage 2 Aerojet AP/polyurethane/Al ca. 270 4-point star 1962
Stage 3 Hercules Powder Company AP/HMX/nitrocellulose/ nitroglycerine/Al ca. 275 core and slotted tube modified end burner 1962

I cant find anything that directly discusses Minuteman-III using Hydroxyl-terminated Polybutadiene (HTPB).

Paul

Offline ncb1397

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Re: SLS Development Stage UPDATE Thread (2)
« Reply #874 on: 12/19/2017 09:24 PM »
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The EM-1 Orion stage adapter, which joins the interim cryogenic propulsion stage to the Orion spacecraft, is nearly finished. In November, engineers installed mounting brackets to hold the 13 CubeSat secondary payload dispensers and one avionics unit. After fitting the brackets, technicians flipped the adapter and installed the diaphragm. The final steps before shipping the adapter to Kennedy Space Center include installing the avionics unit, connecting cables and performing electrical tests, and mounting a hazardous gas detection tube.
https://www.nasa.gov/sites/default/files/atoms/files/sls_november_mthly_highlights_web.pdf


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