Starship's Fourth Flight Test [video]
spacex.com
spacex.com
https://www.timeanddate.com/countdown/launch?iso=20240606T07...
I did not think they would nail the booster landing this flight, as it was not stable all the way down on the last flight. Absolutely incredible watching this live
edit : video clip : https://x.com/SpaceX/status/1798701489097183286
https://will-it-explode.com/vote-starship-integrated-flight-...
And maybe it is a PR strategy: it is fun to watch, the public really see the progress, so it is good for stocks.
But in any case, these all Starships are prototypes, they are meant to fail.
> Don't they already have the knowledge and tech to achieve this?
One could say they don't have all the knowledge, and they lacks some tech. Second stage got clogged thrusters and couldn't orient itself. I believe, that it was ice: there was something white on the video. Compressed gases tend to cool to really low temperatures when they evaporate. Maybe the was water in them, or they themselves started to crystallize.
The booster run into troubles with liquid oxigen filters. I cannot say what happened, but some engines didn't restart. It is much better then with the first test when engines didn't start at T-0:00, but still is not good enough.
Now the second stage will run probably into issues with its heat shield. If it will be able to orient itself properly, unlike the last time.
SpaceX progress with Starship is absolutely bottom level. Not even close to where they want to be.
I recommend looking past all of that and cheer along with the idiots when the mission fails.
throwaway0394:
Not even close to where they want to be.
I recommend looking past all of that and cheer along with the idiots when the mission fails.
It's the old, non-iterative everything-up-front method to rocket development that's weird. At least as a developer it seems obvious that a more hardware-rich approach with a high iteration rate will lead to a better outcome in the end, _especially_ when you're trying to push hard on the technological boundaries.
I know nearly nothing about rocketry, so ELI5 (or give me a wikipedia link!)... anyone know what those floaters are? Is it some byproduct of the fuel? An artifact of the cameras? An illusion coming through the haze of the burning rocket?
You can also see this on the Atlas 5 + starliner launch from yesterday to a lesser degree
Those might be satellites reflecting the light from the engines.
grep -i 'max q' ift* | sed -e 's;^; ;'
ift2-timeline.csv:00:00:52 Max Q (moment of peak mechanical stress on the rocket)
ift3-timeline.csv:00:00:52 Max Q (moment of peak mechanical stress on the rocket)
ift4-timeline.csv:00:01:02 Max Q (moment of peak mechanical stress on the rocket)I don't think this is correct.
"Starship reached orbital velocity!" - https://x.com/elonmusk/status/1768271078999167379
"SpaceX's Starship mega rocket launched from Texas on its third test flight, reaching an altitude of 160 kilometers and achieving orbital velocity [...]" https://x.com/CBCNews/status/1768296197846884741
As we're speaking, IFT4 has reached orbit.
This is incorrect. It got to approximately the same velocity as this launch.
> If you look at the readings on the screen
Uhh.... OK.... https://youtu.be/W1WfCVZFZPo?si=XrVOUvsjxAHsvrLU&t=576
> instead of relying on the press releases of a biased party
Elon Musk... ok, he's a biased party. But I also quoted CBC News. Are you suggesting that they're biased or simply not terribly thorough?
Edit: 28000 km/h at 150 km.
The amount of disinformation that SpaceX and Musk create around failed tests is really annoying and honestly somewhat problematic. It would be nice if SpaceX could just honestly say "this worked and this didn't," but we have to pretend that everything is a miraculous success. After the engine failed on IFT3, the immediate line was "we planned it this way" and then days later "we reached orbital velocity." Launching rockets is impressive enough that you don't have to try to gaslight us all on the way there.
As far as I can tell, my scorecard has IFT1 and IFT3 as failures based on what the flight plans said going in, and IFT2 and (so far) IFT4 as successes.
Edit: I'm suspicious of the fact that they turned off the feed right after cutting the engines and some gas vented. Previous tests have had no problem showing a video feed at this phase.
The orbital relight test was not a factor in the fact that Starship was not intended to reach orbital velocity. You may have noticed that the flight plan indicated that Starship was to land somewhere in the Indian ocean and usually reaching orbital velocity vastly increases the difficulty of doing a planned reentry. The flight plans had them turning off the engines before they actually reached orbital velocity
They scrapped the relight test when they realized that they were losing control authority. The relight test was not meant for reaching orbit, it was to prove they COULD relight the engines on Starship while in space.
Just stop being wrong.
The disinformation I mentioned is why everyone keeps being "wrong" about SpaceX. It's incredibly difficult to be right.
Here's the original graphic that SpaceX put out before the flight happened: https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi...
All the info about IFT-3 pre launch always mentioned that they were deliberately not actually going to enter orbit, so as not to need an unproven de-orbit burn to avoid 100t of space junk.
100t of space junk that would then re-enter at some unpredictable time. Bad idea.
So they were on a trajectory that would automatically have the vehicle re-enter the atmosphere and splash down in some ocean, even if it were fully inert.
Read the IFT-3 pre-flight materials, preferably from a source that comes from before the flight. They clearly intended to enter an orbital trajectory and then get out of it. SpaceX's historical revisionism muddies the waters. At the very least, they would not have announced (ie lied about) successful orbital insertion (which they didn't do) if they had no intention to get there.
They deliberately selected a suborbital trajectory with a velocity that matched orbital reentry... See 1:20 of this video.
Everyone who actually follows SpaceX knows this. You are confidently and totally wrong.https://youtu.be/LOerY66mrPc?si=5FUAARFQ3Z98eqjb
And actually, people rely on drag to deorbit huge objects in space in a controlled manner all the time. It's the preferred way to do it, and is basically the only way it's done - any satellite with fuel left will just stay in orbit. They have it down to a science. Usually they aim for the middle of an ocean. Sometimes they miss and chunks fall in a backyard.
Given that the video was posted 4 days prior to that test, it is downright prescient that they are parroting a post-hoc rationalization.
It's possible that SpaceX made the mistake of using the words "orbital velocity" and this YouTuber is right, though.
You are claiming that, SpaceX never claimed that, only "orbital velocity" meaning "orbital speed" in this context. They wanted to test if the Starship is capable of reaching orbit, but w/o entering orbit for safety reasons. For that they wanted to achieve "orbital velocity" but of course not in an "orbital trajectory".
So there... you're vindicated :-)
How many times can you be so stridently wrong about something before you consider the possibility that you might not know what you're talking about?
> Read the IFT-3 pre-flight materials
I did.
> They clearly intended to enter an orbital trajectory and then get out of it
Nope, they very clearly did not.
Even the graphic you linked to earlier shows this very clearly.
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi...
1. At step 4 for Starship, they write "Once S28 has reached orbital velocity..." Not trajectory. Not orbit.
2. At step 8, we have the "relight demo". Note the last sentence, the one in parentheses: "for an actual deorbit burn, the ship would need to yaw 180º first".
So there is no deorbit burn in the flight plan. The relight demo was just supposed to show that they could relight, and thus hopefully could do a deorbit burn. Note also that the ship deorbited despite the fact that there was no relight demo (never mind no deorbit burn).
Sounds like the plan to de-orbit was then to just go belly forward and let drag take you out of orbit. That is pretty much how every object in LEO de-orbits.
The trajectory was suborbital, the perigee was inside earth so the actual trajectory would intersect the earth's surface, and the atmosphere first.
By the way, I agree that they never intended to complete an orbit, just that they intended to get into (and promptly out of) an orbit. IFT4 did that, for example.
After IFT3 failed to achieve orbital insertion (probably because a leak caused it to run out early), SpaceX announced that not only was the plan to not get to an orbit, but also that they had achieved orbital velocity. They claimed both things!
Both of those claims seem to be lies, and it is also logically inconsistent to claim that you never wanted to reach orbital velocity and also that you got there.
And everything matches what they said, what they filled with FAA prior to the fight, etc.
"for an actual deorbit burn, the ship would need to yaw 180º first"
So there was no deorbit burn planned.
How were they going to get the 100t spaceship out of orbit before completing a single orbit without doing a deorbit burn?
The max q, or maximum dynamic pressure, condition is the point when an aerospace vehicle's atmospheric flight reaches the maximum difference between the fluid dynamics total pressure and the ambient static pressure.
I wonder if the proposed flight path for these tests is published anywhere?
https://www.timeanddate.com/countdown/generic?iso=20240606T0...
I think I made a working one: https://www.timeanddate.com/countdown/launch?iso=20240606T07...
Get the URL by going to the Twitter feed (e.g. via spacex.com/launches if you don't want to search for it) and extract the appropriate URL using the network traffic developer tools of your browser. It might be hosted on pscp.tv, the domain of the old Periscope live video streaming service that Twitter took over some years ago.
Playing this stream with VLC:
VLC -> Media -> Open Network Stream (Ctrl+N) -> Network -> "Please enter a network URL:" -> <insert URL here>
The hard bit coming up in 25 minutes. Going forward getting to this point in the flight plan is now basically table stakes. What a marked difference from V1. Love to see it.
At the end of the video feed for the booster, it looks like there is a huge fire and everything is destroyed, but the crowd is cheering
In the future they'll try catching it.
> Streaming live exclusively on this platform!
Broadcast link,
https://x.com/i/broadcasts/1OwxWYzDXjWGQ
---
edit: It looks like there is a YouTube link available (see comment below mine), and what Elon meant is that SpaceX themselves would be streaming exclusively on Twitter. Apologies for confusion.
Is all I get
Great start.
IFT-3 I ended up watching some random restream of the official X stream on YouTube, which was actually less delayed/buffered than X on my phone was
Twitter has been like this since at least 2016.
Why be on HN calling things names while being stupid? These style of comments are constant on HN now.
I get it's autism insulting the users of the site you want help on, but not the stupidity.
But it's a free account for Twitter. A lot of OSINT is on Twitter. A lot of tech info is on Twitter.
If dumb just do what everyone else does for fucks sake or don't ape the media like an NPC with stupid insults. Pretend you are smart, fake it till you make it.
Yes you need a login. There are always other livestreams on youtube.
Last time there was a VLC compatible stream posted on HN
You will also need latest yt-dlp in path. For linux
$ sudo curl -L https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt... -o /usr/local/bin/yt-dlp
$ sudo chmod a+rx /usr/local/bin/yt-dlp # Make executable
They also might be wary of platforms like YouTube which host "Elon Musk wants to give you Bitcoins" scam videos, which Twitter has a stronger incentive to be aggressive in removing because of who owns it, and then there is value to the company in being able to say "none of the YouTube videos are legitimate, you can only see it here."
Edit: nvm, it is fake
Strange user account name.
Aha, it is fake see - https://www.reddit.com/r/youtube/comments/1d5s80x/laminzu_or... . Normally these are used to push crypto scams.
Unlike today's successful Boeing launch, which wasn't in the feed or any trending topics whatsoever.
Twitter is only a news source for topics with benefits.
https://arstechnica.com/space/2024/06/after-a-successful-lau...
My comment is more about how Twitter is misused.
When Crew Dragon first launched back in 2020 it was news -- i.e. it was literally NEW. They were the first people to launch into space from the US since the shuttle retired.
Crew Dragon last launched in March, and I certainly didn't see anything about it, it's business as usual.
A new A350 flew from Qatar to London today. The first time the A350 flew it was news. Today it's not.
Elon retweeted the livestream and wished them luck : https://x.com/elonmusk/status/1798338630471364871
He also congratulated them and retweeted a follow up post from Nasa Kennedy Space center.