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Commercial and US Government Launch Vehicles => SNC Dream Chaser Section => Topic started by: Ronsmytheiii on 01/22/2018 05:39 PM

Title: SNC DSG NextSTEP-2
Post by: Ronsmytheiii on 01/22/2018 05:39 PM
Presentation to the NASA FISO telecon group from Jeff Valania on SNC's NextSTEP-2  Deep Space Gateway project:

 http://fiso.spiritastro.net/telecon/Valania_1-3-18/
Title: Re: SNC DSG NextSTEP-2
Post by: Lar on 01/22/2018 06:52 PM
Presentation to the NASA FISO telecon group from Jeff Valania on SNC's NextSTEP-2  Deep Space Gateway project:

 http://fiso.spiritastro.net/telecon/Valania_1-3-18/
Fascinating use of some existing components... Nice proposal from a scrappy company (but why ILC Dover instead of Bigelow?)

Title: Re: SNC DSG NextSTEP-2
Post by: yg1968 on 01/22/2018 07:12 PM
Presentation to the NASA FISO telecon group from Jeff Valania on SNC's NextSTEP-2  Deep Space Gateway project:

 http://fiso.spiritastro.net/telecon/Valania_1-3-18/
Fascinating use of some existing components... Nice proposal from a scrappy company (but why ILC Dover instead of Bigelow?)

Bigelow has its own NextSTEP-2 proposal.
Title: Re: SNC DSG NextSTEP-2
Post by: brickmack on 01/23/2018 04:16 PM
Aesthetically way less ugly than their previous concept at least...

Previous proposal involved ISS staging with buildup on Dream Chaser launches, right? Looks like they've gone for a more conventional (rigid) airlock too. I like the reusable LEO-to-cislunar cargo system as well, not 100% sold on use of electric propulsion there though
Title: Re: SNC DSG NextSTEP-2
Post by: yg1968 on 01/26/2018 12:34 AM
SIERRA NEVADA CORPORATION SIGNS TWO NEXTSTEP-2 CONTRACTS WITH NASA
Deep Space Habitat Prototype Production to Begin
https://www.sncorp.com/press-releases/snc-nasa-sign-two-nextstep-2-contracts/
Title: Re: SNC DSG NextSTEP-2
Post by: Patchouli on 01/26/2018 01:23 AM
I like this concept esp the use of solar electric propulsion which would save a lot on refueling.
The hab looks large enough enough it shouldn't feel cramped.
Title: Re: SNC DSG NextSTEP-2
Post by: ncb1397 on 02/03/2018 04:58 PM
Tried to get a sense of the scale of their proposal, so put together this graphic based on known measurements on each spacecraft(NASA reference DSG, SpaceX BFS, SNC DSG and Orion)

(https://i.imgur.com/yrTdx1d.png)

As far as avoiding shadowing on the arrays when putting together a "DST" with multtiple 100 KW PPE units, you can achieve that by adjusting the truss structure.

(https://i.imgur.com/8ZcDlHD.png)

Main problem is that that the indicated 15 mN/KW thrust to power ratio on the AEPS thruster seems low. Other engines are in the 50-90 mN/KW range which would be better for manned interplanetary travel(AEPS works fine for cargo/cislunar). I'm guessing that the magnetic shielding on AEPS extends life considerably at considerable power usage. Anyways, dual habs would provide about 600 cubic meters of volume which is more than you need for interplanetary trips and essentially equivalent to BFS.
Title: Re: SNC DSG NextSTEP-2
Post by: yg1968 on 05/19/2018 02:35 PM
Sierra Nevada Corporation's Lunar Orbital Platform:
https://www.youtube.com/watch?v=Xp_ZODcQcx8
Title: Re: SNC DSG NextSTEP-2
Post by: yg1968 on 05/19/2018 02:48 PM
Here is an article that discusses the video above:
http://www.orlandosentinel.com/news/space/go-for-launch/os-sierra-nevada-corp-lunar-orbital-platform-20180517-story.html
Title: Re: SNC DSG NextSTEP-2
Post by: brickmack on 05/19/2018 05:47 PM
Have they dropped the 2 arrays on the DC-Cargo module-derived portion then? Seemed weird to include that anyway, when they had that giant array on the PPE
Title: Re: SNC DSG NextSTEP-2
Post by: Rocket Science on 05/23/2018 02:35 PM
Presentation to the NASA FISO telecon group from Jeff Valania on SNC's NextSTEP-2  Deep Space Gateway project:

 http://fiso.spiritastro.net/telecon/Valania_1-3-18/
Fascinating use of some existing components... Nice proposal from a scrappy company (but why ILC Dover instead of Bigelow?)
Legacy NASA contractor?
Title: Re: SNC DSG NextSTEP-2
Post by: whitelancer64 on 05/23/2018 02:51 PM
Presentation to the NASA FISO telecon group from Jeff Valania on SNC's NextSTEP-2  Deep Space Gateway project:

 http://fiso.spiritastro.net/telecon/Valania_1-3-18/
Fascinating use of some existing components... Nice proposal from a scrappy company (but why ILC Dover instead of Bigelow?)
Legacy NASA contractor?

Or... Bigelow isn't the only company in the world that could make an inflatable habitat.
Title: Re: SNC DSG NextSTEP-2
Post by: Rocket Science on 05/23/2018 03:09 PM
Presentation to the NASA FISO telecon group from Jeff Valania on SNC's NextSTEP-2  Deep Space Gateway project:

 http://fiso.spiritastro.net/telecon/Valania_1-3-18/
Fascinating use of some existing components... Nice proposal from a scrappy company (but why ILC Dover instead of Bigelow?)
Legacy NASA contractor?

Or... Bigelow isn't the only company in the world that could make an inflatable habitat.
Sure, why not... My observation of Mark at SNC over the years is that he likes to do things the "NASA way" which my thinking is that 'he" believes it gives him a "leg-up" for his company so that the agency feels comfortable with him. Off the top of my head the one time SNC deviated from the "NASA way" was in the proposed use of Hybrid engines for the Crewed DC and it may have cost them the contract and they probably learned from that... IMHO...
Title: Re: SNC DSG NextSTEP-2
Post by: Ronsmytheiii on 08/11/2018 08:43 AM
Quote
Sierra Nevada Corporation (SNC) completed a NASA study for the Power and Propulsion Element (PPE), which is the first module planned to be launched for NASAís Gateway in lunar orbit. The study was performed under one of SNCís Next Space Technologies for Exploration Partnerships-2 (NextSTEP-2) contracts. SNC plans to submit a bid to win the NASA contract when the agency issues its formal solicitation for the element later this year.

http://parabolicarc.com/2018/08/10/sierra-nevada-completes-key-step-nasas-nextstep2-longduration-space-travel-study/