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CEV Design Q&A
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post Oct 6 2007, 02:45 AM
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Starting this thread in hopes that we'll all have some detailed insight into the next generation of MSF engineering.

Noble goal, eh? rolleyes.gif Truth of the matter is that I was just looking at one of the innumerable 'CEV enroute to the moon' artist conceptions, and I realized that the solar arrays as depicted meant that the vehicle almost certainly has to remain in a fixed attitude with respect to the Sun for them to operate at maximum efficiency. IIRC, the Apollos had to spin a bit in order to maintain thermal equilibrium & avoid localized heating and/or freezing.

Am I missing something here in terms of trade-offs? Seems unwieldy at best to have the arrays mounted to a sort of slip-ring assembly (with mast articulation) to maintain solar lock while the main body rotates. Likewise, seems as if an extensive--and in terms of power & volatile requirements/risk, expensive--ECS would be needed to avoid the temperature differential problem if the S/C is intended to maintain a continuous power-positive attitude during transit.

Sure that there's a simple answer I've missed; would very much like to hear it! smile.gif (Let me guess: LOTS of heat pipes?)


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ElkGroveDan
post Oct 6 2007, 03:13 AM
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I have a CEV DVD that the PIO at Dryden gave me. It looks like the vehicle and the solar panels retain a constant attitude for the entire trip. Perhaps those kinds of thermal concerns are not an issue with this more modern vehicle.

I'll see if I can figure out how to convert this into something I can share. Interestingly they are suggesting that the vehicle touchdown on return would be at Edwards. That would be way too cool.


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post Oct 6 2007, 03:36 AM
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QUOTE (ElkGroveDan @ Oct 5 2007, 08:13 PM) *
Interestingly they are suggesting that the vehicle touchdown on return would be at Edwards. That would be way too cool.


Well, can't bust you by then; I'll be long retired! laugh.gif Cool indeed, though.

All I can think of is that they're planning on a very efficient and extensive heat pipe system, then; probably would need a controllable external radiator with a good amount of surface area as well, unless they're dual-using the solar arrays.


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Posts in this topic
- nprev   CEV Design Q&A   Oct 6 2007, 02:45 AM
- - ElkGroveDan   I have a CEV DVD that the PIO at Dryden gave me. ...   Oct 6 2007, 03:13 AM
|- - nprev   QUOTE (ElkGroveDan @ Oct 5 2007, 08:13 PM...   Oct 6 2007, 03:36 AM
- - dvandorn   Y'all have painted the Apollo thermal problem ...   Oct 6 2007, 07:58 AM
|- - Jim from NSF.com   I disagree. There wasn't a difference in the ...   Oct 6 2007, 03:08 PM
|- - dvandorn   QUOTE (Jim from NSF.com @ Oct 6 2007, 10...   Oct 7 2007, 03:16 PM
- - nprev   Aha! I was hoping that MSF sensei oDoug would ...   Oct 6 2007, 12:02 PM
- - ElkGroveDan   Here's a compressed version of the CEV demo vi...   Oct 6 2007, 06:31 PM
|- - ugordan   How old is that video? I might be out of loop, but...   Oct 6 2007, 06:43 PM
|- - ElkGroveDan   QUOTE (ugordan @ Oct 6 2007, 10:43 AM) Ho...   Oct 6 2007, 07:13 PM
|- - simonbp   QUOTE (ugordan @ Oct 6 2007, 12:43 PM) Ho...   Jan 2 2008, 10:10 PM
- - Jim from NSF.com   http://history.nasa.gov/SP-4011/ makes no mention...   Oct 8 2007, 12:26 AM
- - lyford   Nasa Constellation Program Draft Environmental Imp...   Dec 28 2007, 03:14 AM
- - PhilCo126   Check out this Orion 1/48 scale model: http://www....   Jan 15 2008, 10:18 AM
- - nprev   Apparently, a significant resonant vibration issue...   Jan 19 2008, 05:10 PM
|- - ugordan   From what I've read on nasaspaceflight.com thi...   Jan 19 2008, 05:34 PM
|- - nprev   QUOTE (ugordan @ Jan 19 2008, 09:34 AM) S...   Jan 19 2008, 06:04 PM
- - dvandorn   Problem is, the CEV has been redesigned and made s...   Jan 19 2008, 06:27 PM
|- - nprev   QUOTE (dvandorn @ Jan 19 2008, 10:27 AM) ...   Jan 19 2008, 06:42 PM
||- - Jim from NSF.com   QUOTE (nprev @ Jan 19 2008, 01:42 PM) esp...   Jan 20 2008, 02:00 PM
|- - ugordan   I don't think the problem can be adressed by c...   Jan 19 2008, 06:52 PM
|- - nprev   QUOTE (ugordan @ Jan 19 2008, 10:52 AM) I...   Jan 19 2008, 07:13 PM
- - Greg Hullender   Great opportunity for those SpaceX guys to get the...   Jan 20 2008, 04:50 PM


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