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Ulrich Elkmann Offline




Beiträge: 13.459

08.09.2023 22:19
#26 RE: SpaceX. Boca Chica, Starbase. Antworten

Zitat
The Federal Aviation Administration (FAA) announced Friday the conclusion its mishap investigation into the first integrated test flight of SpaceX’s reusable Starship launch vehicle. It stressed SpaceX has 63 corrective actions that need to be taken before Starship can make a second test flight.

“SpaceX must implement all corrective actions that impact public safety and apply for and receive a license modification from the FAA that addresses all safety, environmental and other applicable regulatory requirements prior to the next Starship launch,” the FAA said in a statement.

The announcement came days after SpaceX completed stacking its Starship vehicle (S25) on top of a Super Heavy Booster (B9). Company founder Elon Musk said it was ready for Integrated Test Flight 2 (IFT-2) and was “awaiting FAA license approval”.

The FAA said the mishap investigation report itself won’t be released publicly due to the disclosure of proprietary information within it, but spoke generally to some of the needed changes.
...
Without the full list of 63 changes that the FAA is mandating from SpaceX, it’s impossible to know exactly how close it is to reaching compliance, but the company did provide some updates on Friday.

In its own statement, SpaceX said the first Starship flight offered “numerous lessons” that are guiding the updates being made ahead of the next launch.

“SpaceX has built and tested a hot-stage separation system, in which Starship’s second stage engines will ignite to push the ship away from the booster. Additionally, SpaceX has engineered a new electronic Thrust Vector Control (TVC) system for Super Heavy Raptor engines,” SpaceX stated. “Using fully electric motors, the new system has fewer potential points of failure and is significantly more energy efficient than traditional hydraulic systems.”

One of the big issues that came up during IFT-1 was the delayed destruction of Starship as it failed to reach stage separation. While making its ascent, there were “fires from leaking propellant in the aft end of the Super Heavy booster, which eventually severed connection with the vehicle’s primary flight computer. This led to a loss of communications to the majority of booster engines and, ultimately, control of the vehicle.”

“SpaceX has since implemented leak mitigations and improved testing on both engine and booster hardware,” SpaceX stated. “As an additional corrective action, SpaceX has significantly expanded Super Heavy’s pre-existing fire suppression system in order to mitigate against future engine bay fires.”


https://spaceflightnow.com/2023/09/08/fa...-second-flight/



PS.

Zitat
Abhi Tripathi@SpaceAbhi
I've seen dozens of "Twitter experts" misunderstand this (often time by adding "Breaking..." to their post for extra clicks) so let me reiterate and further explain what Chris details below.

SpaceX LEADS the investigation. SpaceX issues the corrective actions. They pre-write a mishap investigation plan before they even launch. Then they execute their plan if they have an actual mishap. The FAA formally reviews the plan and also the investigation results and SpaceX-recommended corrective actions (but...informally they already know what's coming because of close coordination). The FAA provides feedback, and could recommend adding something if warranted. Their main job is to verify and enforce that SpaceX does what SpaceX said it will do once they approve the final report. In reality, 90% or more of corrective actions may be finished before the report is even formally submitted. Just depends on how well the root cause(s) are understood and easy to fix.

The general public often believes the FAA writes all the corrective actions and has a large team of people conducting the investigation with a heavy hand (e.g. "the big bad government"). No way. I doubt that will ever be the case for any mishap or anomaly. That is simply not how the government is staffed.

The FAA (and their NASA colleagues who have the relevant technical expertise) are typically in super close contact with the SpaceX team through the head of SpaceX Flight Reliability (where the chief engineers reside).

The statements released by the government are usually kept vague but factual, often to the great dismay of social and traditional media (as well as "stans") who want a juicy bite, ideally brimming with conflict. It is in a government agency's best interest to maintain flexibility and work with who they are overseeing...while keeping the politicians and click-bait journalists and influencers away. Inflammatory statements could rally politicians to one side or the other, and then SpaceX and the FAA's job could become charged and harder. Many people want to see that happen for many reasons.

If the final approval stalls, often times it is over a corrective action that was too open to interpretation. As an example of what I mean, if a corrective action is worded as such:
"Redesign of the launch pad to increase its robustness."
Ooh boy. So you want to break that down into discrete actions defining what "robustness" means.

If you want to learn more about the FAA's role, read their website here:
https://www.faa.gov/space/compliance_enforcement_mishap
7:35 PM · Sep 8, 2023



https://twitter.com/SpaceAbhi/status/1700201198941515881

Zitat

Abhi Tripathi @SpaceAbhi
As I stated in an earlier post this week, getting a rocket on the pad and then getting a “you can’t launch yet” statement from the FAA earlier this week is all part of predictable chain of events. Nothing dramatic in any of these moves so far.
4:15 PM · Sep 8, 2023


https://twitter.com/SpaceAbhi/status/1700150870879440937



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

10.09.2023 14:49
#27 RE: SpaceX. Boca Chica, Starbase. Antworten

Hier übrigens die Liste der FAA mit den angemahnten Nachbesserungen und der Status.

Zitat
Elon Musk@elonmusk
Congrats to SpaceX for completing & documented the 57 items required by the FAA for Flight 2 of Starship!

Worth noting that 6 of the 63 items refer to later flights.
10:32 AM · Sep 10, 2023


https://twitter.com/elonmusk/status/1700789411279966339

https://twitter.com/elonmusk/status/1700...9966339/photo/1
https://twitter.com/elonmusk/status/1700...9966339/photo/2

Observation/description ID# Corrective Action Description Status

Tank sensing
C1 Replace certain fittings with welds inside tank / Complete

Aft and cavity environment failure
C2 Increase fire suppression capacity by 15x /Complete

Booster leak mitigation
C3 Replace certain manifolds with welds in specific location / Complete
C4 Replace certain flanges with better seals and improve joint design / Complete
C5 Replace certain fittings with welds in specific location / Complete
C6 Replace accessible valves of a certain type with new design / Complete
C7 Replace certain flange bolts with higher strength bolts and increase torque / Complete
C8 Disallow certain seal re-use, and add cameras to monitor all engines during ground operations / Complete
C9 Increased scrutiny on leak checks / Complete
C10 90+ cameras added to detect leakage during operations / Complete

Raptor leak mitigation
C11 Add leak capture and drain hardware for valves of a certain type / Complete
C12 Add leak checks and screen for porosity on igniter units / Complete
C13 Improved igniter seal design / Future Action
C14 Weld certain alignment bolt holes shut / Complete
C15 Reassess k-factor and torque for engine hot joint #1, add leak capture and route overboard / Complete
C16 Reassess k-factor and torque for engine hot joint #2 / Complete
C17 Add safety cable to certain fluid lines on high risk locations / Complete
C18 Add one methane sensor per engine bay / Complete
C19 Ground test campaign to better characterize typical engine leakage / Complete
C20 Improve structural FEA/Fatigue analysis for all medium to high criticality lines / Complete

Collateral damage from fire
C21 Add insulation to engine lines sensitive to thermally driven loads / Complete
C22 Add insulation to avionic harnessing / Complete
C23 Add backup wire to specific harnessing / Complete
C24 Improve thermal protection of avionics tray / Complete
C25 Change routing to flight computers / Complete

Booster reliability improvement
C26 Replace sensor with more reliable units / Complete
C27 Coat gimbal assembly with lubricant / Complete
C28 Add pump pressure sensors to certain location / Complete
C29 Add pump temperature sensors to certain location / Complete
C30 Replace pump temperature sensors to certain location / Complete
C31 New seal design for certain areas of booster / Complete
C32 Add electric actuation system / Complete
C33 Better manage engine bay pressure by increasing fire suppression capacity by 15x / Complete
C34 Change certain booster valve timing / Future Action

Booster reliability improvement
C35 Add final leak checks for critical joints / Complete
C36 Add support bracket for certain sensor / Complete
C37 Add support bracket for certain sensor / Complete
C38 Add check valves to certain areas of engine / Complete
C39 Improve oxygen valve design / Future Action
C40 Improve oxygen valve seal design / Future Action
C41 Improve design of ht manifold / Future Action

C42 Change nitrogen shutdown usage / Complete
C43 Change engine shutdown logic / Complete
C44 Increase capability for ground leakage mitigation / Complete
C45 Redesign fire suppression system / Complete
C46 Change conditions around bolts / Complete
C47 Change timing of specific valve actuation / Complete


Avionics reliability improvement
C48 Eliminate certain type of connector / Complete
C49 Redesign network architecture / Future Action

Risk Process
C50 Improve risk tracking process / Complete

Safety System
C51 Implement improvements to safety system / Complete
C52 Verify flight safety systems design improvements using additional type of test article / Complete
C53 Verify flight safety system design improvement via analysis / Complete
C54 Perform component testing / Complete

C55 Review and improve operations surrounding flight safety systems / Complete

Change Control
C56 Improve CAD controls / Complete
C57 Ad engineering walkdown / Complete
C58 Improve use of change management system / Complete

Pad Design
C59 Redesign of launch pad deck / Complete
C60 Improve assumptions for new pad deck design / Complete
C61 Add water cooled pad deck / Complete

Pad Design Process
C62 Improve pad deck design documentation / Complete
C63 Improve pad design process / Complete



PS.

Zitat

Scott Manley@DJSnM
A lot of these changes are ‘reduce chance of thing leaking under flight conditions, and adding stuff to help find origins of leaks’
I don’t know if they’re going to be able to downlink 90+ engineering cameras in flight or if that’s primarily for pad operations.
3:48 PM · Sep 10, 2023


https://twitter.com/DJSnM/status/1700868795441783047]



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

04.11.2023 12:32
#28 RE: SpaceX. Boca Chica, Starbase. Antworten

Zitat
SpaceX poised for ‘mid-November’ launch of second Starship test flight

More than half a year after its first flight, SpaceX believes it’s on the cusp of getting to launch its Starship rocket for a second time.

On Friday afternoon, the company updated its website to announce that the second integrated flight test (IFT-2) of it’s towering rocket “could launch as soon as mid-November, pending regulatory approval.” Sources suggest the launch could be as soon as Nov. 13, but that’s far from set in stone.

Those regulatory hurdles surrounding the fully reusable launch vehicle are now mainly centered around the conclusion of an environmental review, which is in the hands of the U.S. Fish and Wildlife Service (FWS).

Earlier this week, the Federal Aviation Administration (FAA) said it had concluded the Starship-Super Heavy safety review. In a statement to Spaceflight Now, the agency said that “The environmental review is the last major element to complete before the FAA makes a license determination.”



https://spaceflightnow.com/2023/11/04/sp...ip-test-launch/

Auch wenn es nicht so aussieht: aber es ist nicht SpaceX, sondern die Flugishcerheitsbehörde FAA, die hier in der Zwickmühle sitzt. Natürlich können sie durch die Verweigerung weiterer Probestarts den gang der Dinge um Monate, wenn nicht Jahre, verzögern. Aber die Freigabe ist die einzige Mögichkeit, das "System Starship" in der Prais zu testen, uz verbesern & eine Freigabe für bemannte Starts zu erhalten. Und der Termin für die Bemannte Landung von Artemis 3 steht mit Ende 2025 bislang fest. Und bis dahin muß das Starship nicht nur eininge erfolgreiche Starts, sondern verläßlich mehrere sichere Landungen hintereinander absolviert haben.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

06.11.2023 19:35
#29 RE: SpaceX. Boca Chica, Starbase. Antworten

Zitat
Everyday Astronaut@Erdayastronaut
Hey @elonmusk / @SpaceX, for the upcoming Starship IFT-2 mission, is there a way to have mission control audio come through local analogue airways, or a low latency digital stream (like on spaces) so those watching in person have a reliable countdown? X / YouTube streams are 10-20 seconds behind real time and makes for the potential to miss the launch due to delayed information. Or at least a low latency YouTube stream for Mission Control audio or launch like the old days would be nice too!
6:50 PM · Nov 6, 2023

Elon Musk@elonmusk·38m
We can improve the latency for real-time video on 𝕏. It should be as fast as your connection will allow.

Everyday Astronaut@Erdayastronaut·28m
I think the lowest latency option would be for SpaceX to do mission control over X's "spaces" so it's virtually real time. Even SRT feeds or HVEC will always have some noticeable latency, no matter the connection speed


https://twitter.com/Erdayastronaut/statu...585800423305498

Wer einmal ein paar Starts von SpaceX mitverfolgt hat, weiß, daß das Videosignal (bei beiden Stufen der Raketen) mit ungefähr 10 Sekunden Zeitverzögerung läuft.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

14.11.2023 21:21
#30 RE: SpaceX. Boca Chica, Starbase. Antworten

Kommt gerade rein.

Zitat

Elon Musk@elonmusk
Was just informed that approval to launch should happen in time for a Friday launch

Zitat
SpaceX@SpaceX
Starship preparing to launch as early as November 17, pending final regulatory approval → http://spacex.com/launches
2:58 AM · Nov 11, 2023


4:40 AM · Nov 14, 2023



https://twitter.com/elonmusk/status/1724271004044644800



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

16.11.2023 08:55
#31 RE: Starship Startfreigabe Antworten

Zitat
FAA clears SpaceX for second Super Heavy-Starship test flight

SpaceX’s huge Super Heavy-Starship rocket has been cleared for a second test flight Friday in an attempt to boost the unpiloted Starship upper stage into space for the first time, the company announced Wednesday.

The Super Heavy’s liftoff from SpaceX’s Boca Chica flight test facility on the Texas Gulf Coast is targeted for 8 a.m. EST Friday, the opening of a two-hour window.


https://spaceflightnow.com/2023/11/16/fa...ip-test-flight/



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

16.11.2023 21:19
#32 RE: Starship Startfreigabe Antworten

Zitat
Update (2:30 p.m. EST Thurs. Nov. 16, 2023): Launch delayed to Saturday to replace grid fin actuator.


https://spaceflightnow.com/2023/11/16/fa...ip-test-flight/

Zitat
Elon Musk@elonmusk
We need to replace a grid fin actuator, so launch is postponed to Saturday
8:17 PM · Nov 16, 2023


https://twitter.com/elonmusk/status/1725231694645461403



PS.

Zitat
Liftoff is currently scheduled for Saturday, November 18th after Elon stated that one of Booster 9’s grid fin actuators needed to be replaced.The new 20-minute launch window opens at 7:00 a.m. CT, meaning the expected T-0 may vary due to the circumstances of the test.


https://tlpnetwork.com/news/2023/11/spac...eady-for-launch

Central Time = 7h vor MEZ; die Startzeit bleibt also wie beim ersten vorgesehenen Versuch bei 14:00.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

17.11.2023 14:15
#33 RE: Starship Startfreigabe Antworten

Zitat
Chris Bergin - NSF@NASASpaceflight
Now inside T-24 hours. Hot Staging Ring is reinstalled after workers replaced three grid fin actuators overnight.

Preparing to return to full stack for a launch attempt on Saturday morning.

http://nsf.live/starbase
2:04 PM · Nov 17, 2023


https://twitter.com/NASASpaceflight/stat...500222262984914

Zur Erinnerung: beim "Stacking," beim Aufeinandersetzen, wird die 50m hohe Zweitstufe mit Hilfe der Mechazilla-Greifarme so eben von der 70m hohen Startstufe demontiert, abgesetzt & nach der Nachbesserung wieder aufgesetzt. Jeder dieser Liftvorgänge dauert ca. 90 Minuten.



Womit übrigens 3 Starts von SpaceX innerhalb von 24 Stunden anstehen (vorausgesetzt, es verzögert sich nichts): Starlink Tranche 6-28 von Cape Canaveral in 14h, 30 Min, Starlink 7-7 von Vandenberg in 17h 45 Min und Starship von Boca Chica in 23h 30 Min.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

18.11.2023 13:16
#34 RE: Starship Startfreigabe Antworten

Livestream (T minus 45 Minuten):

https://www.youtube.com/watch?v=m-LFzFWaACo

Zitat
37 minutes ago
Propellant load is underway. SpaceX reports weather looks good for today's planned test flight.


https://spaceflightnow.com/2023/11/18/li...nd-test-flight/

Zu den beiden anderen Starts, die ich ein Stockwerk höher erwähnt habe: Starlink 6-28 von Cape Canveral hat um 08:05 MEZ abgehoben; 7-7 ist gestern abend um 24 Stunden verschoben worden und soll in 18 Stunden starten.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

18.11.2023 13:36
#35 RE: Starship Startfreigabe Antworten

Betankungsstatus, MEZ 13:34.

Starship:
CH$ 89%
LOX 93%

Booster:
CH4 65%
LOX 68%



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

18.11.2023 14:02
#36 RE: Starship Startfreigabe Antworten

Start. Explosion des Boosters 30 Sekunden nach Stufentrennung in 60 km Höhe.
09:28. Starship hat Umlaufbahn erreicht.
10:30. Wie es aussieht, ist auch die Zweitstufe, noch über den Golf von Mexiko, explodiert.

Das "hot staging" bei der Stufentrennung (Zündung der sechs Merlin-Motoren, während die Stufen noch nicht getrennt sind) hat wie vorgesheen funktioniert.
Keins der 33 Triebwerke der Startstufe ist ausgefallen.

Zitat
Chris Bergin - NSF@NASASpaceflight
Ship 25 FTS triggered. But what a win!

Amazing performance from the Booster - firing all 33 going uphill. Hotstaging worked. All six engines on Ship 25 firing for a long duration.

And all our cams around the pad are OK. No rock tornados this time! Thanks Water Deluge System!
2:17 PM · Nov 18, 2023


https://twitter.com/NASASpaceflight/stat...865737577693400



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

18.11.2023 15:45
#37 RE: Starship Startfreigabe Antworten

Genaue Zahlen.

Die Stufentrennung ist bei Minute 2:48 in einer Höhe von 73 Kilometern und einer Geschwindigkeit von 5280 km/h erfolgt.
Der Booster ist 13 Sekunden später bei der Zündung der Triebwerke für den "Boostback burn" zur Abbremsung für die Landung explodiert, in 80 km Höhe.
Das Starship ist bei t +7.07 explodiert, bei einer Geschwindigkeit von 17.752 km/h, in einer Höhe von 149 km.




Zitat
SpaceX@SpaceX
Congratulations to the entire SpaceX team on an exciting second integrated flight test of Starship!
Starship successfully lifted off under the power of all 33 Raptor engines on the Super Heavy Booster and made it through stage separation

The booster experienced a rapid unscheduled disassembly shortly after stage separation while Starship's engines fired for several minutes on its way to space.

With a test like this, success comes from what we learn, and today’s test will help us improve Starship’s reliability as SpaceX seeks to make life multiplanetary
3:12 PM · Nov 18, 2023


https://twitter.com/SpaceX/status/1725879726479450297



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

18.11.2023 16:39
#38 RE: Starship Startfreigabe Antworten

Zitat
Zack Golden@CSI_Starbase
Lots of TPS tiles missing on S25 today. It’s important to note that SpaceX likely fully expected this to happen. On S28 every tile was tested using a suction cup to verify adhesion. This was not performed on S25 and as a result a large number of tiles along the ring weld lines fell off during flight.

In other words, it’s not as bad as it looks.
4:00 PM · Nov 18, 2023


https://twitter.com/CSI_Starbase/status/1725891849225679047



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

18.11.2023 23:53
#39 RE: Starship Startfreigabe Antworten

Letztlich ist das hier zu diesem Zeitpunkt frei flottierender Flurfunk, aber ich geb' das mal weiter.

Zitat
Seemed from the footage like slosh & possible ullage collapse extinguished one or more engines and kept others from starting up for boostback, followed by FTS. Awesome progress, very exciting that both stages made it through stage sep intact.

4:35 PM · Nov 18, 2023


https://twitter.com/BellikOzan/status/1725900525932327089

"Ullage" bedeutet in der Nautik fehlenden Treibstoff in einem Tank, infolge von Lecks oder durch Verdunstung. In der Raumfahrt werden kleine Hilfstriebwerke, sog. ullage engines, verwendet, die kurz vor der Neuzündung eines Hauptantriebs gezündet werden und den Treibstoff im Tank gegen den Boden/die Brennkammer drücken. Nach der Stufentrennung beim Start und dem MECO (dem Main Engine Cutoff) befindet sich die Startstufe im freien Fall, so daß das nicht durch die Erdschwerkraft erfolgt.



PS. Und dies noch.

Zitat
Scott Manley@DJSnM
I resynced the telemetry bar with the video of MECO & Hot Stage. Now it's more obvious the order of engine shut down, relight and failure on the boost back.
I suspect that booster failure is something like a fluid hammer effect given the stop and restart puts lots of stress on plumbing.

One thing I wondered was whether the engines failing on one side had any relation to the rotation, but by matching the restart we can see the rotation probably isn't correlated with this.
3:13 PM · Nov 18, 2023


https://twitter.com/DJSnM/status/1725879871115833705

Erster Gedanke: bei den beiden atmosphärischen Zündungen der F9-Booster (in 52 bzw. 3 km Höhe) kommt es aber zu keinem vergleichbaren Druckstoß ("water hammer")... Zweiter Gedanke: dort zünden auch nur 3 bzw. 1 der Merlin-Triebwerke, und die Raptor-Motoren der zweiten Baureihe, wie sie in B9 verwendet worden sind, sind ganz andere Ungeheuer in ihren technischen Spezifikationen, die mit einem inneren Druck von 300 Atmosphären arbeiten. Zudem ist flüssiges Methan 8mal so dicht wie flüssiger Wasserstoff, der dort verbrannt wird.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

19.11.2023 20:09
#40 RE: Starship Startfreigabe Antworten

Zitat
Scott Manley@DJSnM
So, if we can trust the telemetry from Starship’s flight, there was a significant negative g observed on the booster during staging. More force was transmitted to the booster than anticipated during hot staging, this would have generated a lot of propellent slosh that may have been enough to damage the booster and ultimately cause it to fail.

One last observation - during hot staging the booster velocity drops rapidly for a moment, this is faster than can be explained by gravity. If this is accurate the booster had negative g loading for a moment, possibly lifting propellent off bottom of tanks. It's very short, but still a bigger deceleration than I expected
9:44 PM · Nov 18, 2023


https://twitter.com/DJSnM/status/1725978274348908929

Die entsprechende Stelle findet sich im Video des Starts bei Minute 02:45, bei einer Höhe von 71 km. Innerhalb von nur einer Sekunde sinkt die Geschwindigkeit des Boosters von 5620 km/h auf 5578 km/h.

Zum "Hot staging": kurz vor der Stufentrennung sind erst die 20 Triebwerke des äußeren Rings abgeschaltet worden, dann die 10 des inneren. Die drei zentralen Raptor-Triebwerke haben weiterhin Schub geliefert, um den Treibstoff für die zweite Stufe in Richtung der Triebwerke zu pressen. Zum Zweck der heißen Stufentrennung, also vor der Abtrennung der beiden Komponenten die 6 Raptor-Triebwerke des Starship zünden zu können, hat Space X zwischen die beiden Stufen einen großformatig perforierten Trennungsring, in technischen Jargon "vented interstage" genannt, montiert, um die austretenden Gase seitlich abzuleiten. Nach dieser Vermutung oben hätte dieser Schub so stark auf den Booster eingewirkt, daß der restliche Treibstoff dort zu sehr Kobolz geschlagen hätte.

Die russischen Raketen verwenden seit 65 Jahren heiße Stufentrennungen; die NASA hat es nur für die Titan II verwendet, mit der die 12 Starts des Geminiprogramms zwischen 1964 und 1966 durchgeführt worden sind. Der Knackpunkt ist, daß es sich bei allen diesen Systemen um Einmal- und Wegwerfraketen (ge)handelt (hat), bei denen eine Neuzündung der Triebwerke nie vorgesehen war.

Die Startstufe, Seriennummer B8, ist Ende 2022 voll montiert worden und hat seine ersten Kühl- und Druckbetankungen am 22. und 29. Dezember 2022 bestanden. Die Vented Interstage ist vier Monate nach dem ersten Starship-Start, am 18. August 2023, aufgesetzt worden. Am 5. September ist das Starship Nr 25. zum ersten Mal aufgesetzt worden; abgebaut am 14. September; am 21. September ist auch der Zwischenring wieder abgebaut worden. Von Anfang Oktober bis zum Start gestern ist die Kombination noch 5 Mal montiert und wiederabgebaut worden; das ditte Mal, um am 9. November das Selbstzerstörungssystem (Flight Termination System) am Booster zu installieren.

Auf Starbase befinden sich zurzeit noch die Booster 10 bis 13, zwei davon betriebsfertig in der Mega Bay 1; Nr. 11 auf dem Teststand für Kühltests bei der Betankung mit flüssigem Methan/Sauerstoff und Nr. 13 in der Endmontage.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

19.11.2023 21:32
#41 RE: Starship Startfreigabe Antworten

Zitat
Elon Musk@elonmusk
Just inspected the Starship launch pad and it is in great condition!
No refurbishment needed to the water-cooled steel plate for next launch.
Congrats to @Spacex team & contractors for engineering & building such a robust system so rapidly!
8:54 PM · Nov 19, 2023


https://twitter.com/elonmusk/status/1726328010499051579



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

20.11.2023 07:35
#42 RE: Starship Startfreigabe Antworten

Zitat von Ulrich Elkmann im Beitrag #40

Auf Starbase befinden sich zurzeit noch die Booster 10 bis 13, zwei davon betriebsfertig in der Mega Bay 1; Nr. 11 auf dem Teststand für Kühltests bei der Betankung mit flüssigem Methan/Sauerstoff und Nr. 13 in der Endmontage.


Zitat
Elon Musk@elonmusk
Starship Flight 3 hardware should be ready to fly in 3 to 4 weeks. There are three ships in final production in the high bay (as can be seen from the highway).
3:07 AM · Nov 20, 2023


https://twitter.com/elonmusk/status/1726422074254578012

Herr Musk ist in solchen Terminesetzungen bekanntlich überaus großzügig. Im April hieß es nach dem ersten fehlgeschlagenen Start: "in zwei Monaten." Es sind dann doch 7 geworden.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

13.01.2024 00:17
#43 RE: Starship Startfreigabe Antworten

Verspäteter Nachtrag zu Starship / Integrated Flight Test 2.

Zitat
Gav Cornwell@SpaceOffshore
Elon on Starship Flight 2: "Flight 2 actually almost made it to orbit (...) The reason it didn't quite make it to orbit is we vented the liquid oxygen (...) ultimately led to a fire and explosion (...) we wanted to vent the (LOX) because we normally wouldn't have had that (LOX) if we had a payload. Ironically if it had a payload it would have reached orbit"
12:11 AM · Jan 13, 2024


https://twitter.com/SpaceOffshore/status/1745946623958483273



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

Ulrich Elkmann Offline




Beiträge: 13.459

27.02.2024 00:30
#44 RE: Starship Startfreigabe Antworten

Update zu Starship, Integrated Flight test 2 (IFT-2).

Zitat
February 26, 2024

Following stage separation, Super Heavy initiated its boostback burn, which sends commands to 13 of the vehicle’s 33 Raptor engines to propel the rocket toward its intended landing location. During this burn, several engines began shutting down before one engine failed energetically, quickly cascading to a rapid unscheduled disassembly (RUD) of the booster. The vehicle breakup occurred more than three and a half minutes into the flight at an altitude of ~90 km over the Gulf of Mexico.

The most likely root cause for the booster RUD was determined to be filter blockage where liquid oxygen is supplied to the engines, leading to a loss of inlet pressure in engine oxidizer turbopumps that eventually resulted in one engine failing in a way that resulted in loss of the vehicle. SpaceX has since implemented hardware changes inside future booster oxidizer tanks to improve propellant filtration capabilities and refined operations to increase reliability.

At vehicle separation, Starship’s upper stage successfully lit all six Raptor engines and flew a normal ascent until approximately seven minutes into the flight, when a planned vent of excess liquid oxygen propellant began. Additional propellant had been loaded on the spacecraft before launch in order to gather data representative of future payload deploy missions and needed to be disposed of prior to reentry to meet required propellant mass targets at splashdown.

A leak in the aft section of the spacecraft that developed when the liquid oxygen vent was initiated resulted in a combustion event and subsequent fires that led to a loss of communication between the spacecraft’s flight computers. This resulted in a commanded shut down of all six engines prior to completion of the ascent burn, followed by the Autonomous Flight Safety System detecting a mission rule violation and activating the flight termination system, leading to vehicle breakup. The flight test’s conclusion came when the spacecraft was as at an altitude of ~150 km and a velocity of ~24,000 km/h, becoming the first Starship to reach outer space.

SpaceX has implemented hardware changes on upcoming Starship vehicles to improve leak reduction, fire protection, and refined operations associated with the propellant vent to increase reliability. The previously planned move from a hydraulic steering system for the vehicle’s Raptor engines to an entirely electric system also removes potential sources of flammability.

The water-cooled flame deflector and other pad upgrades made after Starship’s first flight test performed as expected, requiring minimal post-launch work to be ready for vehicle tests and the next integrated flight test.


https://www.spacex.com/updates

Also ein blockierter Filter in der Zuleitung für flüssigen Sauerstoff und ein Leck in der unteren Stufe.



"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire

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