Seems like the booster landing burn did not light all the engines and so it crashed into the water.
They had been explaining the post-ignition abort from last week, and showed how 4 out of 33 engines had failed to light on the first stage. This was due to some kind of pump malfunctions. They said that if 1 or 2 fail, it's OK to launch, but more than 2 is an automatic abort. So they were able to replace the finicky motors and fully test them out.
Who knows what caused the underthrust for the landing burn, but at least all 33 engines were operational at launch, and they got plenty of data from this test run, and all Starlink v3 satellites have been deployed successfully for their "suborbital speedrun", so this test flight is doing really awesome!
Is this just a fancy way of saying lightweight fragile aerospace tube with hot stuff all over the outside and flammable stuff on the inside will not respond well to falling on it's side or is there some other thing going on here I don't know about.
There was a couple of times when SpaceX accidentally soft landed a Falcon 9 first stage into the ocean, and had it just float around. They're yet to do that trick with Starship though.
EDIT: Of fucking course.
We had it demonstrated in the past with Starship surviving multiple burnthroughts and now in failing to explode. :-)
This was a great flight, though.
This way they got way more heat shield data, which is, I think, their most critical item they need to learn from and iterate.
interesting, i had no idea. I was going off the info i remembered about when those unexploded parts floated into Mexican waters. It's exciting to see Startship v3 have a perfect test flight. Hopefully the next launch will be fully orbital and they can start making productive use of the capability.
What I find really amazing and cool is that while its reentering the engineering team can drive it around and look at heating effects on tiles/spars/etc all while retrieving telemetry by Starlink. What many people don't realize is that early capsules were the shape they were because that was the limit of what they could simulate for re-entry forces. The ability to get real time confirmation of systems response in re-entry is a capability that we've never had. So there's that.
So at this point it looks like they are down to un-reliabile raptor relights on the booster.
Congrats to everyone who worked on this.
The SpaceX solution is to steer carefully and have the default trajectory end in the sea. Only if everything looks good, is the booster redirected to the tower.
Raptors are much more finely controllable and both stages of Starship can even hover when necessary, so the total control envelope, while not perfect, is much larger. That is why they can even try to land into a steely embrace, with no landing legs used.
Did the suicide burn actually play a role in the various barge-holing events? It’s been a while but I don’t remember that being the hard part.
What they cannot is achieve thrust-to-weight ratio of <= 1 when the first stage is empty, so controlled descent is basically impossible and suicide burn is the only option to land.
When it comes to failed returns, I think that at least once they ran out of fuel several meters early(?)