Cuky
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Posts posted by Cuky
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4 hours ago, Exoscientist said:
Sorry, but a 10 second burn is not “full-duration”. THIS is full-duration:
If test parameters are "Start all 6 engines, keep them on for 10s and then shut down and have no problems during all of that" and they burn for those 10s that means that full duration of the test was performed. How is that so hard to grasp for so many static fires and pages of this thread is beyond me really.
All engines are tested before they get to be mounted on SH or SS and what those static burns are are basically checks to see that all the plumbing, wiring etc. was done correctly. Same as F9, they raise it vertical on launch pad, test fire for few seconds to see that everything is in spec and prepare for launch.
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6 minutes ago, Mikki said:
(Not related to recent events)
Can`t dragchutes/ parachutes or glidechutes assist SH and SS at landing and save on fuel?
The whole system starts to look bruteforcing a good idea which should be smoothed somehow.
(But who am i to ask such dumb questions ;D)
they could, but that beats the goal of rapid reuse. Parachutes need to either be repacked after landing which takes quite a bit of time. Since it would probably include removing them from the vehicle to repack they could switch them up for already pre-packed ones. But that again adds complexity and failure mode to the vehicle.
On the other hand it could include some that are used higher up and then jettisoned. But then they have failed in making a fully reusable vehicle since they throw parachutes away.
As for bruteforcing the landing, I guess they are searching for limits of control so that they can design the system that can precisely place the booster in a place for chopsticks to catch it.
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Great, more competition = more pushing for developing needed technologies = faster progress.
But on the other side, Boeing can't reliably get astronauts into LEO, yet they think of being first to Mars
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My feeling is that mishap isn't because of braking up during re-entry but rather because of problems they had with controling both the booater and the ship. I may be wtong but I understood that goal of this flight was to get to orbital speed, test control of booater when returning, show that they cen transfer fuel internaly on the ship, test the control of a ship a d re-enter the atmosphere with hipefully not breaking up. Both booster and shio had problems with control and mishap investigation will probably look into reasons behind that.
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As a launch vehicle it is undoubtedly outdated. As a tool to keep jobs for people and votes for politicians it is not good, it is brilliant.
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2 hours ago, Exoscientist said:
could we get a lunar lander that could be used on the SLS to get a single launch lunar landing architecture that staged from NRHO? The answer is yes. If we made it an Apollo-sized lander but hydrolox powered instead of using storable propellant engines.
Whilst I agree with most of your post this is the part that I don't. Whilst yes, with some different design choices, they could have done what they did in Apollo that wouldn't make much sense tbh. Back then the goal was to get to the Moon and return back and do it before Soviets do it. Now the goal is not to just go to the Moon and come back, the goal is to go to the Moon, stay there for longer period of time and when the crew comes back different crew can take over from where they left. It is not about going to the Moon, it is about staying on the moon. And Apollo, or any vehicle/program designed as a modern version of Apollo wouldn't be able to pull that off.
Also, if I am not mistaken Orion itself is one big confused spacecraft which can't decide what it wants to be. It was designed to fly astronauts to the Moon, but also as a transportation to the ISS and possibly other stations. I think I have also seen some plans to use it for Mars missions as well where astronauts would get into LEO on Orion, dock with big Mars vessel in which they would be for the duration of the flight. Orion would stay as a life boat and go to the Mars and back and then return crew to the Earth once they come back.
And as fighter planes have shown, trying to make one design to be at the top of the game in many different aspects results in a compromised design that is good enough at everything but is mastering nothing and is usually much more expensive.
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This is the first launch since they started streaming exclusively on X that I did not forget to watch. Launch went well as usual, recovery as well. But I am super disappointed by the stream. When they were on YouTube it was always nice and crisp in full screen no matter where I was watching (smartphone, 1440p PC monitor or 4K TV). On X it looked as if the stream was in 480p or 720p at max and it really felt as a step back in comparison to my previous experiences.
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6 minutes ago, Exoscientist said:
SpaceX still not doing full thrust, full flight duration static fires for either stage.
Robert Clark
I may be wrong but they aren't doing full flight full thrust static fires for Falcon 9 either.
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53 minutes ago, Exoscientist said:
The Raptor has been in development since 2016 and no such reliability estimates are offered for it for an engine intended to power craft carrying astronauts and even civilian passengers.
You are comparing still in development rocket engine with the one that has been in developing and flying (not competely without a glitch) since 1960s.
Merlin engines as well didn't work flawlessly but soacex improved on design until it got to the point that they are now where they more often scrub the launch or loose a booster due to bad weather for recovery than because of. technical issues.
I guess this SpaceX program has the same opposition as it was for when they were choosen for crew transport to ISS... it is best left to do for big government contractors because there is not place for a private company to develop the tools and know how. I think most still can't wrap their heads around someone willing to spend money building stuff and testing until failure i stead of running simulations for years without any tangible hardware to be seen. And that is then more fueled by smears against Elon that mainstream media is pushing around
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13 hours ago, Vanamonde said:
@Cuky, please clarify if this is only on the Science sub?
Lately I am actively browsing only through the Science sub so that is where I have noticed it. A bit of briwsing that I did through KSP 1 and 2 modding sub didn't have any problems, but it was too small of a sample to really make a good judgement on it
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I have a problem on. mobile where the page loads, but pics and links (nost notably X) don't. Then after few seconds the whole page just goes blank white and I have to refresh. On PC I haven't had anny issues.
Both on my PC and Android I use the latest available version of Firefox
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Christmas eve LES test went (totally not) as planned so instead we informed the media about the big fireworks we've had at Kerbal Space Center
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1 hour ago, CatastrophicFailure said:
Have you never seen the ISS?
Sadly no. Even starlink today I just happened to be outside at the time they were passing above. The problem I have is that it mostly passes far out of sight and is only visible for few seconds so I don't even try. But now that you asked me I went to check and on December 20th it should pass above just 100-150km north from where I am located and should be visible for around 5 minutes so I might go looking for it if I don't forget
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A bit under 3h ago was the first time that I have seen Starlink satellites passing above my island and those weren't as bright as I actually expected. If they didn't move in a perfect line one after the other one could easily mistake them for a star or a plane. But it was nice finally experiencing seeing something man made with my naked eyes in the night sky
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50 minutes ago, tater said:
I didn't know they launched for 250 times already, let alone landed that many times. Just wow!
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Have they stated any reason, other than Elon owning X now, why they stopped streaming launches on YouTube? While they were on even if I forgot about the launch I would get a notification and I'd watch or, in cases where time zone differences meant it was in super early morning for me I'd watch a replay. Since they stopped streaming on YouTube I haven't seen a single launch, X is just not my go to app/site.
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2 hours ago, Exoscientist said:
I am dismayed by the level of unreliability of the Raptor. In this latest static fire test two of the Raptors had to be shut down for only a 5 second test and 50% thrust level. But this is the same number that had to be shut down in the earlier static fire test prior to a test launch for only a 5 second test at 50% thrust level. Does anyone really believe the Raptor is more reliable than before?
At this point I don’t think anyone doubts that if there is another test launch in like two weeks there will be engine failures like before. The only question is how many. Will it this time be only four or six instead of eight? Or this time will it be 10 or 12 or more instead of eight? Nobody not even SpaceX knows the answer to that.
Bob Clark
If Raptor was an engine that is being used in commercial applications then yes, those failures would be quite worrying. But Raptor is still very much a in development engine and new version is already in the pipeline.
As a comparison I would use the F1 engine from Saturn V... they were unable to go through any test without it going RUD, but by the time they got to operational status the bugs were ironed. out and they worked like a charm for the most part
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SpaceX confirmed it that all but 2 Raptors did the full duration test
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Don't know how trustworthy this article is, but here it states that it was a 33-engine test with 4 shutting off prematurely
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2 hours ago, darthgently said:
If enough drone ships are made available, I'd think weather windows would be the next bottleneck. Hopefully, the ability to launch in more and more extreme weather will grow with time as happened with aircraft
Even then the number of launch pads and possibly range would become a bottleneck.
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47 minutes ago, Ultimate Steve said:
Soon I expect people to seriously suggest that Falcon 9 is an unreliable piece of junk because of failed fairing recoveries. Unless another Falcon blows up soon, that's about the last leg they can stand on, and it is mighty wobbly.
IMHO that just shows how far Spacex has came. From "they are crazy for talking about landing and reusing boosters, it can't be done" to "landing failures are super rare, but should be counted as launch failures"
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6 hours ago, CBase said:
Since it got a little bit lost into some discussions: SpaceX targets today another attempt !
A little surprising as I thought the TFR was cancelled.
It was reinstated, but was lost in this thread as well
6 hours ago, CBase said:
SpaceX Discussion Thread
in Science & Spaceflight
Posted
If Dreamchaser proves to be capable of rapid reuse and then they combine it with a reusable launcher then we will finally get what Shuttle was supposed to be - a rapidly reusable human acces to space. Eventually working in tandem with Starship and New Glenn as heavy cargo launchers we could. finally have what was envisioned in 70s before all the compromises came into Shuttle program to accomodate different interests from those footing the bill. Better late than never I guess