Zitat So SpaceX's process is messier, but it is also much faster. Consider this: NASA spent billions of dollars and the better part of a decade constructing the Space Launch System rocket that had a nearly flawless debut flight—aside from damage to the launch tower—in late 2022. NASA followed a linear design method, complete with extensive and expensive analysis, because a failure of the SLS rocket would have raised serious questions about the agency's competence.
Fortunately for SpaceX, the company can afford to "fail." It can do so because it has already built three more Super Heavy rockets that are nearly ready to fly. In fact, SpaceX can build 10 Super Heavy first stages in the time it takes NASA to build a single SLS rocket. If the first five fail but the next five succeed, which is a better outcome? How about in two or three years, when SpaceX is launching and landing a dozen or more Super Heavy rockets while NASA's method allows it a single launch a year?
So, yes, SpaceX's rocket exploded on Thursday. The company will learn. And it will fly again, perhaps sometime later this fall or winter. Soon, it probably will be flying frequently.
Hier kommt man übrigens zum gleichen Schluß wie meine Wenigkeit.
Zitat
Zitat The more footage that's coming in from the remote cameras the more it looks like they just got very lucky. Super heavy is quite a vehicle to have survived so much ground damage. HPU shrouds were both torn off and missing after liftoff HPUs were exposed to the air stream. Subsequently exploded between 30 seconds and 50 seconds into flight. Probably due to ground damage.
What are the HPU shrouds?
Hydraulic Power Unit covers, referred to as “chines” here.
IIRC the next booster won’t even use hydraulic TVC.
B9, the next booster, won't have hydraulic tvc. The "chimes", the three long covers that run to around half the height of the lox tank do not house the HPU, they house COPVs. The HPU are housed in smaller covers nearly at engine level.
Zitat Quote from: novo2044 on 04/20/2023 06:21 pm
Do we have any actual confirmation it was debris that caused the engine outs?
Nothing official lots of video evidence of debris chunks flying vertical up the side of the vehicle. Implies heavily it was blasting up into the engine bay as well.
Same thing happened during one of the starship static fires they had to re build the entire back end of the vehicle after and replace the engines due to the damage.
Zurzeit geht die Diskussion dahin, daß der Ausfall der ersten 3 Raptor-Triebwerke beim Start wohl darauf zurückzuführen ist, daß sie durch hochgeschleuderte Betontrümmer unter dem Starttisch beschädgit worden sind. und daß die Belastung der Hydraulikleitungen, um den asymmetrischen Schub zu kompensieren, zu deren Explosion geführt hat.
Zitat Erc X @ErcXspace Launch animation, accurate flame diverter? 11:18 PM · Oct 7, 2020
Elon Musk @elonmusk Aspiring to have no flame diverter in Boca, but this could turn out to be a mistake 11:19 PM · Oct 7, 2020
Zitat A flame trench is a long deep channel situated below the launchpad of an orbital rocket and forms part of the flame trench-deflector system. It is used to deflect the flames generated by the first-stage rocket boosters away from the rocket to protect the vehicle from the heat and energy generated. ... Conclusion
The flame trench-deflector system is one of the unsung heroes of a successful orbital rocket launch. Although relatively simple in design, the system has proven its effectiveness over time by safely deflecting the hot gases from a rocket’s boosters away from the launchpad.
As this article illustrated, alongside the sound suppression system, a launch site’s flame trench forms a crucial part of keeping an orbital launch vehicle, launchpad, and support structure safe during a launch event.
Zitat von Teslarati vom 13.12.2019In a very on-brand move, SpaceX has decided to build Starship’s East Coast orbital pad within the bounds of Pad 39A but without using the pad’s existing launch mount or concrete flame trench. Instead, SpaceX is building a separate steel mount and water-cooled thruster diverter designed to stand up to the fury of a Super Heavy booster without allowing the rocket’s plume to dig a crater in the ground after ever ignition.
While choosing to pursue a dramatically different launch pad design for Starship may at first glance seem risky, SpaceX actually has more than a decade of experience building and operating similar mount and flame diverter setups at its McGregor, Texas rocket development and test facilities. A step further, NASA itself once heavily relied on similar technologies and strategies to rapidly build, test, and fly rockets larger than anything that came before them.
Most notably, the Saturn I rocket that preceded the massive Saturn V used a launch mount and flame diverter that looks quite similar to a conceptual setup SpaceX recently showed off in an updated Starship launch render.
Booster 9 wird übrigens für die TVC / Schubvektorensteuerung keine Hydraulik mehr verwenden.
Zitat Booster 9 (B9)
Booster 9 (B9) is a Super Heavy booster prototype. After assemby, it was moved to the OLS cryo station for preliminary structural testing. According to Elon Musk it has many design changes with regard to B7 and likely also B8:
As it appears, B9 is the first booster to use electric TVC (Thrust vector control) actuators instead of hydraulic, as no hydraulic power units have been installed as of September 27.
27 Sep 2022: Spotted in mega bay, it appears to be the first booster to use electric TVC (thrust vector control) as no hydraulic power units have been installed.
Zitat Eric Berger@SciGuySpace The damage in Boca Chica at the Starbase launch site looks pretty serious, but a former senior SpaceXer from there says he believes the pad can be repaired; and a (water-cooled?) flame diverter installed in 4 to 6 months. Just passing on what I was told. 11:11 PM · Apr 21, 2023
Eric Berger@SciGuySpace·13m "The lead mechanical guy responsible for the launch mount/flame diverter is one of the smartest people I know. I bet his team designed the launch mount that exists now for some sort of flame diverter to be installed in the future knowing that this was going to happen."
Elon Musk@elonmusk·4m 3 months ago, we started building a massive water-cooled, steel plate to go under the launch mount.
Wasn’t ready in time & we wrongly thought, based on static fire data, that Fondag would make it through 1 launch.
Looks like we can be ready to launch again in 1 to 2 months.
Eric Berger@SciGuySpace·5m Thanks Elon. Good luck!
Analyse der Videoaufnahmen des Starts zeigt mindestens 2 größere Bruchstücke des Betonbodens unter em Starttisch direkt neben der Raketenspitze in 100 m Höhe; sie wurden also nicht nur zur Seite geschleudert, sondern auch senkrecht empor; somit ist es durchaus möglich, daß solche Trümmer die ersten 3 Raptoren getroffen haben.
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
Zitat von Ulrich Elkmann im Beitrag #4 Im Englischen nennt man das wohl "the smoking gun."
Der Chef vor 10 Minuten:
Zitat Elon Musk@elonmusk Still early in analysis, but the force of the engines when they throttled up may have shattered the concrete, rather than simply eroding it. The engines were only at half thrust for the static fire test. 5:42 PM · Apr 22, 2023
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