Author Topic: Ares I Development Thread  (Read 339488 times)

Offline Jim

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Re: Ares I Development Thread
« Reply #1320 on: 08/04/2017 01:39 PM »

J-2X is an essential engine for the SLS and manned-exploration programs,

Not true at all.  An assumption not supported by data.  J-2X is not needed for anything.
« Last Edit: 08/04/2017 01:40 PM by Jim »

Offline TrevorMonty

Re: Ares I Development Thread
« Reply #1321 on: 08/04/2017 02:45 PM »
OA NGL will use BE3 as its US engine.

Unfortunately for J-2X it is never likely to fly.

Offline Propylox

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Re: Ares I Development Thread
« Reply #1322 on: 08/05/2017 03:40 PM »
Unfortunately for J-2X it is never likely to fly.
I was thinking the same thing about New Glenn, Vulcan and NGL which is why I asked about an Ares1 redux.

Offline Jim

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Re: Ares I Development Thread
« Reply #1323 on: 08/05/2017 03:49 PM »
Unfortunately for J-2X it is never likely to fly.
I was thinking the same thing about New Glenn, Vulcan and NGL which is why I asked about an Ares1 redux.

There is nothing that supports such thinking.  NG and Vulcan are flying.  If they don't fly, J-2X is certainly not going to fly.  Actually, there is no scenario where J-2X flies, especially since SLS is not going to last long.  There is even less chance of Ares I redux.  There is no case that supports NASA developing such a vehicle.
« Last Edit: 08/05/2017 03:53 PM by Jim »

Offline Patchouli

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Re: Ares I Development Thread
« Reply #1324 on: 08/07/2017 09:33 PM »


J-2X is an essential engine for the SLS and manned-exploration programs, thus I'm assuming its production and use as the 2nd-stage engine. I'm also assuming a 5m 2nd-stage based on the Delta IV, or Vulcan, or a redesign of the Delta IV with common bulkhead, or a knockoff from elsewhere ~ whatever.
Lastly, I'm using Antares' upper and orbital placement from prime contractor Orbital/ATK for GTO launches.



I'd say it's more of a nice have engine for some missions mostly ones needing the largest possible LEO payload vs absolutely necessary.
Though for those missions the simpler and cheaper to produce J-2S would be more desirable I'm surprised they didn't go this route with the J-2X after Ares I was canceled.
« Last Edit: 08/07/2017 09:35 PM by Patchouli »

Offline Propylox

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Re: Ares I Development Thread
« Reply #1325 on: 08/08/2017 04:09 AM »
I'd say it's more of a nice have engine for some missions mostly ones needing the largest possible LEO payload vs absolutely necessary.
Though for those missions the simpler and cheaper to produce J-2S would be more desirable I'm surprised they didn't go this route with the J-2X after Ares I was canceled.
It's not simply "large-to LEO", but delivers +40mT to the Moon in addition to +130mT to LEO without Advanced Boosters, or RS-25, and uses the same tooling as the core. I'd say that's "nice to have". Here's the +70mT single stage as well as two-stage core configuration. Discuss here;
Rocket https://forum.nasaspaceflight.com/index.php?topic=38069.msg1705330#msg1705330
Boattail https://forum.nasaspaceflight.com/index.php?topic=38069.msg1706197#msg1706197
« Last Edit: 08/08/2017 04:10 AM by Propylox »

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