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MSL Cruise Phase
nprev
post Nov 26 2011, 03:50 PM
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Okay, we're off and running! Please post all comments relating to MSL's transit to Mars here.


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Hiwayman
post Dec 4 2011, 03:56 PM
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Sorry for this being posted in the wrong forum, but the launch topic is closed. Did anyone notice the "umbilical" or "hose like" aperture that was still attached to the fairing during launch? It was about 10' - 15' ft from the top of the nose and protruded out about 3-4 feet? Not all cameras caught it, but it was clearly visible on the camera that showed the fairing separation, and another ground based camera. Once the fairing was ejected, the aperture went with it, so it became a mute point, but it sure looked like it was something that should have been left on the ground rather than fly with the vehicle. Did anyone see it? It obviously did not affect the trajectory as it was close to perfect.
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post Dec 4 2011, 08:43 PM
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QUOTE (Hiwayman @ Dec 4 2011, 04:56 PM) *
Sorry for this being posted in the wrong forum, but the launch topic is closed. Did anyone notice the "umbilical" or "hose like" aperture that was still attached to the fairing during launch? It was about 10' - 15' ft from the top of the nose and protruded out about 3-4 feet? Not all cameras caught it, but it was clearly visible on the camera that showed the fairing separation, and another ground based camera. Once the fairing was ejected, the aperture went with it, so it became a mute point, but it sure looked like it was something that should have been left on the ground rather than fly with the vehicle. Did anyone see it? It obviously did not affect the trajectory as it was close to perfect.


At NASASpaceflight.com they have a drinking game going on for every time this question is being asked (ps: better to ask a question about it than just assuming it is an error):...
http://forum.nasaspaceflight.com/index.php?topic=27385.360

QUOTE
QUOTE
QUOTE
???
I was rewatching the curiosity launch and noticed a thin bent tube rocket firing on the side of the fairing right before fairing sep...what is the engineering and aerospace reasoning for this?
LH2 vent fin

Atlas V launch drinking game: when someone asks this question, drink. When someone answers accurately, drink. If Jim is first, drink again.


And as to what it actually is, it is called the LH2 vent fin.

Supremely uncatastrophical explanation here:

"Its a LH2 vent fin — a small pipe. The RL-10 engine, which powers the second stage of the rocket and is enclosed inside the fairing, uses liquid hydrogen as fuel. The LH2 is constantly boiling off producing gas, some of it is used to keep the tank pressurized, the rest must be vented overboard as a gas (it is not ignited) to avoid an explosive situation in the enclosed and confined interstage area while the RL-10 engine is inactive.
After the fairing is jettisoned, the H2 gas is simply vented directly to space causing the flare/glow that you see.
As far as any thrust is concerned resulting from the venting, it is trivial compared to the muscle of the RD-180 engine which powers the first stage — there is a lot of control authority from it."

Engineering drawings here:
http://forum.nasaspaceflight.com/index.php?topic=26327.345
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Posts in this topic
- nprev   MSL Cruise Phase   Nov 26 2011, 03:50 PM
- - Oersted   The live footage of the first couple of kilomete...   Nov 26 2011, 03:52 PM
- - climber   Oppy, here I come ! Waiting for post launch co...   Nov 26 2011, 04:07 PM
|- - Oersted   QUOTE (climber @ Nov 26 2011, 05:07 PM) O...   Nov 26 2011, 04:34 PM
|- - climber   QUOTE (Oersted @ Nov 26 2011, 05:34 PM) W...   Nov 26 2011, 04:48 PM
- - nprev   Yeah, that was indeed a beautiful sight to behold,...   Nov 26 2011, 04:08 PM
- - vikingmars   ... and we just had champagne at home near Paris t...   Nov 26 2011, 04:14 PM
- - DEChengst   They just started showing the title card for the p...   Nov 26 2011, 05:34 PM
|- - sgendreau   EDIT2: Not much news. No news is good news for ...   Nov 26 2011, 06:01 PM
- - dmg   Anyone know why the telemetry pickup from the laun...   Nov 26 2011, 07:07 PM
- - MarsEngineer   No news is good news indeed! We are watching...   Nov 26 2011, 09:51 PM
|- - Pando   QUOTE (MarsEngineer @ Nov 26 2011, 02:51 ...   Nov 26 2011, 11:16 PM
|- - Oersted   QUOTE (MarsEngineer @ Nov 26 2011, 10:51 ...   Nov 27 2011, 12:20 AM
- - climber   Tanks Rob, I was browsing like mad to get any news...   Nov 26 2011, 10:11 PM
- - MERovingian   Bravo to all the teams involved, JPL, ULA, NASA, K...   Nov 26 2011, 10:52 PM
- - nprev   Rob, thanks very much for taking the trouble durin...   Nov 27 2011, 12:01 AM
- - Explorer1   Actually the last EDL was in 2008 with the Phoenix...   Nov 27 2011, 12:01 AM
- - Oersted   I uploaded footage of the launch and spacecraft se...   Nov 27 2011, 12:44 AM
|- - Syrinx   Thank you sir for the videos. I was unable to wat...   Nov 27 2011, 02:02 AM
- - tanjent   I'm having some trouble with "data dropou...   Nov 27 2011, 03:34 AM
|- - kwan3217   (Full inline quote removed- Mod) The apogee for a...   Nov 27 2011, 02:23 PM
|- - scalbers   QUOTE (kwan3217 @ Nov 27 2011, 03:23 PM) ...   Nov 27 2011, 04:08 PM
|- - kwan3217   (Full inline quote removed- Mod) The guys at JPL ...   Nov 28 2011, 08:58 PM
- - john_s   I was watching those numbers too. The apogee shou...   Nov 27 2011, 03:54 AM
- - tanjent   OK - I bet it actually finds the perigee by lookin...   Nov 27 2011, 04:04 AM
|- - MahFL   The separation video was just awesome, although I ...   Nov 27 2011, 04:49 AM
|- - OKB001   QUOTE (MahFL @ Nov 26 2011, 08:49 PM) The...   Nov 27 2011, 05:59 AM
- - tanjent   Well, the altitude should be directly observable b...   Nov 27 2011, 02:50 PM
- - Astro0   A little late to the party I guess. My weekend was...   Nov 27 2011, 10:05 PM
|- - MarsEngineer   QUOTE (Astro0 @ Nov 27 2011, 02:05 PM) A ...   Nov 28 2011, 12:36 AM
- - Oersted   Oh, a rainbow to boot! Lovely panorama and tha...   Nov 27 2011, 10:30 PM
- - MarsEngineer   Hi all, Please take a look at the observations ma...   Nov 28 2011, 12:54 AM
- - nprev   ...words utterly fail me. Just remarkable. Many t...   Nov 28 2011, 12:59 AM
- - eoincampbell   WOW! Thanks for sharing another "Heimdall...   Nov 28 2011, 03:05 AM
- - tanjent   Quote: http://www.facebook.com/BrisbanePlanetarium...   Nov 28 2011, 08:36 AM
- - Oersted   That is an amazing timelapse! http://www.yout...   Nov 28 2011, 01:12 PM
- - Oersted   On my youtube page of MSL launch movies I am getti...   Nov 28 2011, 03:10 PM
|- - Greg Hullender   QUOTE (Oersted @ Nov 28 2011, 07:10 AM) ...   Nov 28 2011, 03:57 PM
- - Roby72   Here you could see Curiosity 10 hours 30 minutes a...   Nov 28 2011, 09:51 PM
- - Bobby   Question? Is there a site either through JPL or a...   Nov 29 2011, 12:40 AM
- - punkboi   http://space.jpl.nasa.gov/ MSL's position sho...   Nov 29 2011, 12:49 AM
- - Astro0   As usual, Eyes on the Solar System can take us all...   Nov 30 2011, 04:12 AM
- - Explorer1   Is the cruise stage's spin in real-time? Great...   Nov 30 2011, 05:57 AM
|- - MahFL   Don't forget, the whole Rover is spinning....l...   Nov 30 2011, 12:08 PM
- - MahFL   I am not sure how accurate the model is but it loo...   Nov 30 2011, 12:13 PM
- - ilbasso   Should we bring her back for repairs?   Nov 30 2011, 12:18 PM
|- - MahFL   I just read that the hand lens imager can take pic...   Nov 30 2011, 01:52 PM
|- - eoincampbell   QUOTE (MahFL @ Nov 30 2011, 05:52 AM) ......   Nov 30 2011, 04:19 PM
|- - Deimos   http://msl-scicorner.jpl.nasa.gov/Instruments/MAHL...   Nov 30 2011, 04:50 PM
- - pospa   Also VERY cool would be any MAHLI picture from ins...   Nov 30 2011, 02:22 PM
- - climber   You can even dream of a shot of Spacecraft separat...   Nov 30 2011, 03:05 PM
- - ElkGroveDan   The next images we'll see from MSL will likely...   Nov 30 2011, 03:46 PM
- - djellison   QUOTE (pospa @ Nov 30 2011, 06:22 AM) Als...   Nov 30 2011, 04:40 PM
|- - MarsEngineer   QUOTE (djellison @ Nov 30 2011, 08:40 AM)...   Nov 30 2011, 04:57 PM
- - john_s   I love the idea of the rover doing an "arms-l...   Nov 30 2011, 05:21 PM
- - djellison   It took all the way until working on the MSL anima...   Nov 30 2011, 05:23 PM
- - climber   I noticed on a previous video that legs extended a...   Nov 30 2011, 06:18 PM
- - djellison   Actually - the descent stage thrusters do start be...   Nov 30 2011, 07:25 PM
- - john_s   That "hard drop", with the rover falling...   Nov 30 2011, 07:38 PM
|- - climber   I read, where?, that, as soon as released, Curiosi...   Nov 30 2011, 07:53 PM
- - Ron Hobbs   From what I thought was a very informative article...   Nov 30 2011, 08:17 PM
|- - djellison   Ron - as far as I know, that article has it about ...   Nov 30 2011, 10:33 PM
|- - MahFL   Well I should have known better the tragectory man...   Dec 1 2011, 12:23 AM
- - Syrinx   http://www.sciencedaily.com/releases/2011/...11201...   Dec 2 2011, 07:42 AM
- - stevesliva   Seems to be regurgitating the same source: http://...   Dec 2 2011, 07:56 AM
|- - MahFL   The Eyes on the Solar System make my IE 8 crash af...   Dec 2 2011, 03:10 PM
|- - djellison   QUOTE (MahFL @ Dec 2 2011, 07:10 AM) The ...   Dec 2 2011, 06:52 PM
- - B Bernatchez   No problems for me (that wouldn't be fixed by ...   Dec 2 2011, 05:42 PM
- - Mars Attack   I'm a bit concerned about the reported reset o...   Dec 4 2011, 02:57 PM
|- - stevesliva   QUOTE (Mars Attack @ Dec 4 2011, 10:57 AM...   Dec 4 2011, 04:55 PM
||- - Mars Attack   QUOTE (stevesliva @ Dec 4 2011, 04:55 PM)...   Dec 4 2011, 05:20 PM
|- - Paolo   QUOTE (Mars Attack @ Dec 4 2011, 03:57 PM...   Dec 4 2011, 07:04 PM
- - ElkGroveDan   There is extra fuel aboard and my understanding is...   Dec 4 2011, 03:42 PM
|- - centsworth_II   QUOTE (ElkGroveDan @ Dec 4 2011, 10:42 AM...   Dec 4 2011, 07:18 PM
- - Hiwayman   Sorry for this being posted in the wrong forum, bu...   Dec 4 2011, 03:56 PM
|- - Oersted   QUOTE (Hiwayman @ Dec 4 2011, 04:56 PM) S...   Dec 4 2011, 08:43 PM
- - elakdawalla   Someone else pointed this out to me on the Atlas f...   Dec 4 2011, 04:19 PM
|- - Hiwayman   QUOTE (elakdawalla @ Dec 4 2011, 09:19 AM...   Dec 4 2011, 04:28 PM
|- - climber   QUOTE (elakdawalla @ Dec 4 2011, 05:19 PM...   Dec 4 2011, 06:52 PM
- - djellison   From http://trs-new.jpl.nasa.gov/dspace/handle/201...   Dec 4 2011, 08:23 PM
- - nprev   Yeah, it really was a sweet launch...and major kud...   Dec 4 2011, 08:49 PM
- - Mars Attack   Mr. Doug Djellison, any chance that you could expa...   Dec 4 2011, 11:00 PM
- - djellison   We hope to - but it's entirely a matter of bud...   Dec 4 2011, 11:12 PM
|- - climber   QUOTE (djellison @ Dec 5 2011, 12:12 AM) ...   Dec 5 2011, 11:38 AM
- - punkboi   You can now view MSL's current position in spa...   Dec 7 2011, 05:57 AM
- - Syrinx   http://space.jpl.nasa.gov/cgi-bin/wspace?t...=1...   Dec 7 2011, 07:56 AM
- - Lucas   For the impatient among us... http://space.jpl...   Dec 7 2011, 02:56 PM
- - pospa   T +18 days - MSL has about 9% of its cruise done a...   Dec 14 2011, 02:32 PM
- - punkboi   Where is Curiosity now? There's now a dedicate...   Dec 14 2011, 10:27 PM
- - Lunik9   New sunspot 1387 erupted during the late hours of ...   Dec 26 2011, 09:28 AM
- - Explorer1   How large would an event have to be to seriously i...   Dec 26 2011, 11:40 PM
|- - centsworth_II   According to Curiosity and the Solar Storm, CMEs p...   Dec 27 2011, 08:05 AM
- - pospa   TCM-1 scheduled for Jan 11th, dv 5,5 m/s. Then eq...   Jan 6 2012, 11:03 PM
- - pospa   TCM-1 completed successfully. Rob Manning describ...   Jan 13 2012, 10:01 AM
- - Phil Stooke   "By the time a CME reaches the Earth-Mars exp...   Jan 13 2012, 12:12 PM
- - climber   According to AW&ST next trajectory correction ...   Jan 31 2012, 06:53 PM
- - pospa   Not sure if mentioned here before, but radio amate...   Feb 6 2012, 09:53 AM
- - MahFL   Software fix for Star Tracker problem. Tracker   Feb 10 2012, 01:37 PM
- - Mars Attack   The computer that received the software fix, is i...   Mar 1 2012, 03:36 PM
- - MahFL   QUOTE (Mars Attack @ Mar 1 2012, 03:36 PM...   Mar 2 2012, 12:20 AM
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