Artemis Moon Program

Empire said:
UPDATE: Get excited! NASA officials said in an update Tuesday that the next attempt to launch Artemis 1 will happen on Saturday, Sept. 3, from the Kennedy Space Center.

The launch window opens at 2:17 p.m.
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Saturday? I thought that it was going to be Friday. Oh well looks like I will have something to look forward to come the weekend, let’s see if the SLS can actually launch this time round.
 
FighterJock said:
Empire said:
UPDATE: Get excited! NASA officials said in an update Tuesday that the next attempt to launch Artemis 1 will happen on Saturday, Sept. 3, from the Kennedy Space Center.

The launch window opens at 2:17 p.m.
Click to expand...

Saturday? I thought that it was going to be Friday. Oh well looks like I will have something to look forward to come the weekend, let’s see if the SLS can actually launch this time round.
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Maybe because the weather will look better?
 
https://twitter.com/x/status/1564737334066790405
View: https://twitter.com/ChrisG_NSF/status/1564737334066790405

Chris G tweet said:
3/x: Management Team agreed to change loading procedure and start engine chilldown earlier. Work at pad to address LH2 leak purge can, and moved launch to SATURDAY, Sept. 3rd! OK... one extra day to launch.
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https://twitter.com/x/status/1564739028674662403
View: https://twitter.com/chrisg_nsf/status/1564739028674662403


6/x: They will open up the LH2 purge can, inspect, and re-torque and make a change to how things flow into the purge can.
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https://twitter.com/x/status/1564739444367695872
View: https://twitter.com/bubbinski/status/1564739444367695872


Mark Berger, weather officer: issue with lightning just before tanking. Thunderstorms threatened for one hour. Rest of tanking weather was quiet, but new storms moved westward and was no go at T-0. Also cleared all weather violations in the last 3rd of window.
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https://twitter.com/x/status/1564739702518857728
View: https://twitter.com/spcplcyonline/status/1564739702518857728


Berger: weather on Sat favors showers and possibly a few thunderstorms but optimistic at least some clear air in the afternoon. Possibility of violation is pretty high though [I didn't hear him say what it is.]
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Apparently it was a faulty sensor causing the problems but it’s hard to replace it at the pad.
https://twitter.com/x/status/1564751273676705793
View: https://twitter.com/jeff_foust/status/1564751273676705793


End of the briefing. Takeaway is that NASA is thinking the anomalous engine 3 temp may be a sensor issue: the way the sensor is behaving, Honeycutt said, doesn’t match the physics of the situation. Replacing the sensor now isn’t feasible, so developing flight rationale.
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Flyaway said:
Apparently it was a faulty sensor causing the problems but it’s hard to replace it at the pad.
https://twitter.com/x/status/1564751273676705793
View: https://twitter.com/jeff_foust/status/1564751273676705793


End of the briefing. Takeaway is that NASA is thinking the anomalous engine 3 temp may be a sensor issue: the way the sensor is behaving, Honeycutt said, doesn’t match the physics of the situation. Replacing the sensor now isn’t feasible, so developing flight rationale.
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NASA better fix the sensor before they try to launch the SLS on Saturday better being safe than sorry. If that means missing Saturdays launch window and going into September.
 
As a former QA/QC person, I'm a bit surprised those temperature sensors were not subject to a local 'sanity' check. That's where, before putting the widgets on-line, you line up a bunch side-by-side and compare their readings at a set of temperatures spanning usage range. If cryo-end requires thermo-wells in a dewar of eg liquid air, so be it...
 
TomcatViP said:
My cultural lag might show off as much as your network data rate... But who's the guy?!
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Gary Seven

memory-alpha.fandom.com

Gary Seven

Captain, we could say that Mister Seven and Miss Lincoln have some interesting experiences in store for them.Spock Gary Seven was the code name for a Human male whose ancestors were abducted from Earth around 4000 BC and taken to another planet. He was a Class 1 supervisor, and listed as...
memory-alpha.fandom.com memory-alpha.fandom.com
 
If the rocket has been detanked wouldn't technicians be able to enter the thrust structure's inspection hatch check out the sensor?
 
Flyaway said:
https://twitter.com/x/status/1565452010568253442
View: https://twitter.com/spcplcyonline/status/1565452010568253442


Chatting with Aerojet Rocketdyne folks here at the NASA KSC press site, they are "100%" certain the problem is the sensor, which is on the core stage side of the interface between the hydrogen tank and the engine.
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So what are the chances that the SLS will lift off as scheduled on Saturday if the sensor is still playing up? I thought that NASA would have to de-fuel the rocket so that they can fix the sensor.
 
FighterJock said:
Flyaway said:
https://twitter.com/x/status/1565452010568253442
View: https://twitter.com/spcplcyonline/status/1565452010568253442


Chatting with Aerojet Rocketdyne folks here at the NASA KSC press site, they are "100%" certain the problem is the sensor, which is on the core stage side of the interface between the hydrogen tank and the engine.
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So what are the chances that the SLS will lift off as scheduled on Saturday if the sensor is still playing up? I thought that NASA would have to de-fuel the rocket so that they can fix the sensor.
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Time is of the essence here. If they are sure that the problem is with the sensor, it is not worth the time and effort to de-fuel the rocket and risk missing the launch window. Now or never.
 
in my opinion this is a make or break situation.
the last time NASA took a risk it ended in the deaths of seven people. the sensor i am worried about the most. if there is an issue withe the engine and the sensor is unable to detect it and deploy countermeasures or emergency prompts. the entire craft is at risk.
the issue with the exterior insulation. the chances of debris coming off and ripping the rocket to pieces is low. but still possible.
the fact that they are still going for launch is risky. but bold. we will either see history. or see a tragedy that will forever be etched in our minds, and history textbooks.

however i am confident that NASA will do everything they can to be as persistent as possible to make this launch not only possible. but successful.
 
https://twitter.com/x/status/1565688524686376961
View: https://twitter.com/jeff_foust/status/1565688524686376961


Launch weather officer Melody Lovin says weather should trend better through the 2-hour launch window: 60% go at the start to 80% at the end.
For backup day Monday 70% go, but a little more uncertainty.
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https://twitter.com/x/status/1565689190674829314
View: https://twitter.com/jeff_foust/status/1565689190674829314


She adds there could be showers around the time taking starts, but difficult to predict. Any delays in tanking is not necessarily a minute-for-minute launch delay, says Jeremy Parsons, deputy manager of exploration ground systems.
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https://twitter.com/x/status/1565689261550190593
View: https://twitter.com/cbs_spacenews/status/1565689261550190593


SLS/Artemis 1: 1st and 2nd stage tanks should be topped off and in replenish mode by 12:07pm with a final 30m hold at the L-minus 10-minute point starting at 1:37pm; assuming management concurrence, the count should resume at 2:07pm for a launch at 2:17pm
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indicisivedivide said:
Why does nasa have such an affinity for hydrolox engines. They are a pain to work with as far as I know.
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Better specific impulse...lighter....lends itself to NTRs...water vapor exhaust. Well worth it.

I just wish Musk wasn't so afraid of it. It may just be a sensor glitch---like on my car recently.
 
publiusr said:
indicisivedivide said:
Why does nasa have such an affinity for hydrolox engines. They are a pain to work with as far as I know.
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Better specific impulse...lighter....lends itself to NTRs...water vapor exhaust. Well worth it.

I just wish Musk wasn't so afraid of it. It may just be a sensor glitch---like on my car recently.
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The energy density is so low that the tank will have to be huge in volume. Also liquid hydrogen is very difficult to handle.
 
The huge volume is a plus if you go wet workshop. No heat shield, no Adama maneuver---that's hard to handle too.
 
NMaude said:
indicisivedivide said:
The energy density is so low that the tank will have to be huge in volume. Also liquid hydrogen is very difficult to handle.
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That's why RP-1 is a more appropriate fuel for a first-stage and a major factor why the Saturn 5's S-IC used RP-1 instead of LH2.
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A modernised f-1 would be better than the rs-25 cluster
 

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