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SpaceX Starship rocket explodes minutes after launch from Texas

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Re: SpaceX Starship rocket explodes minutes after launch from Texas

#421

Earlier quoted context omitted.

Part of SpaceX company culture. All their launches are cheer-heavy. Even mission control gets rowdy at times.

I remember I think it was when they first landed the booster successfully, there was a big "USA! USA! USA!" cheer from mission control. I thought that was a bit of an ugly look myself.

yes the USA chant was cringe as heck but otherwise their cheering is fun

Re: SpaceX Starship rocket explodes minutes after launch from Texas

#422
post #105

According to https://www.metaculus.com/questions/14270/spacex-starship-or... its chances to reach orbit in 2023 have just risen from 85% to 90%. Therefore generally I would call the launch a relative success.

It looks like it has dropped 4% over the last week, so while the monthly trend is upwards, I'm not sure this launch, or the scrub a few days ago, have improved things.

[deleted]

Re: SpaceX Starship rocket explodes minutes after launch from Texas

#423

One interesting observation here is how long it took the ship to get off the pad from the T-0 mark. This is undoubtedly because some of the raptors on it apparently failed to ignite. I thought they were about to make a mess on the launch pad! I'm also curious about what technically finally got it off the ground - was there a sufficient, but low, level of acceleration, was it a matter of reducing the rocket's mass (by…

I believe this is intentional. They engines start with less thrust than is needed to launch the rocket and only throttle up fully after the system checks pass.

Re: SpaceX Starship rocket explodes minutes after launch from Texas

#425

I'm really interested to see the hole it dug under the launch mount. The NASA SpaceFlight van took a direct hit from a fast moving chunk of concrete. https://twitter.com/JerryPikePhoto/status/164905272269878477... https://twitter.com/LabPadre/status/1649053476276797440 Edit: it really did dig a crater (this was flat concrete under the pad before): https://twitter.com/LabPadre/status/1649062784167030785

I wonder if this was expected or not. This video immediately comes to mind:

https://www.youtube.com/watch?v=gMbUeO4iGhY (Why SpaceX Cares about Concrete)

This probably explains why some of the engines didn't make it off the pad. That is some incredible damage.

Re: SpaceX Starship rocket explodes minutes after launch from Texas

#426
post #287

Success was defined as the rocket leaving the launchpad. Suggesting that this test “failed” is at best a mischaracterisation.

The Soviet N1 moon rocket, which SpaceX shares a bit of design (30+ engines for example) failed 4 times before being scrapped. The Soviets had the 'launch often, fail fast, learn faster' view that SpaceX employs today. However, nobody viewed the N1 launches outside the Soviet Union as successes. I'm glad to see that 'fail fast, learn faster' is finally part of American aerospace engineering.

Very different situations. N1 was a technical blunder on many levels (and it wasn't a moon rocket - it was a hastily repurposed LEO launcher intended for in-orbit assembly, not optimal for the TLI).

Instead of adopting the proven R-7 stacking scheme which was much easier to test piece by piece, Korolyov opted to a novel design which was too wide (17m!!), and static fires required a humongous and prohibitively expensive testing facility. The lack of static fires made the development too slow and expensive, as the only way to test it was in the actual flight. Combine this with other technical mistakes (the shape led to the extra weight while the modularity wasn't required, too much drag, etc) and Mishin's poor leadership after Korolyov's death, and you have a recipe for a failed project.

Starship is much narrower (9m), today's tech is much better, so the static fires are much cheaper; and unlike N-1, it's actually designed for fast iterations from the ground up.

Re: SpaceX Starship rocket explodes minutes after launch from Texas

#427

It sounds like they achieved what they were officially hoping to achieve. Everyone was cheering but Musk didn't look super happy imo.

Elon is on the record as saying that launches cause him massive anxiety so I'm sure it was difficult to be outwardly happy

Re: SpaceX Starship rocket explodes minutes after launch from Texas

#428
post #5

[flagged]

That’s off topic and mods should remove. Let’s not go into twitter and trans rights when the topic is on spaceX and their launch.

Ignoring anti trans behavior by powerful people is default approval. I’m not saying everyone needs to include a disclaimer in every comment but you’re out of line for suggesting this is off topic and you should reflect on yourself for-why you’re so offended seeing people advocating for the rights of groups Musk is repressing.

Re: SpaceX Starship rocket explodes minutes after launch from Texas

#429

Earlier quoted context omitted.

I suspect SpaceX will have to add something resembling an escape system before the thing gets "man-rated". That system could also be used to protect the passengers in case of a failed landing. It will add weight and thus lower the carrying capacity but they seem to have enough margin to allow for such an addition. They already have the header tanks in the top of Starship, adding a number of escape engines and some ex…

They want to carry 100 people. An escape system for those many people is the same scale of a commercial airliner escape system, which is designed to be operated on a stationary plane, on land or water. Astronauts will be well trained to use it but I think that there must be a lot of openings to let 100 people get out quickly in mid air. Maybe they'll agree that Starship is its own escape system. There is a section ab…

The big problem with the Space Shuttle was that the orbiter was located next to the fuel tank and between the solid boosters instead of on top of it. This made it impossible to perform the normal "accelerate away from the big boom" manoeuvre which normal rocket escape systems use. On Starship the passengers will be situated above the explosives instead of next to them/between them. As to whether it is possible to add escape engines of sufficient power to pull away the nose cone, push it up into a parabolic trajectory of sufficient height to give parachutes the chance to deploy I don't know but at least it could be done in theory where the design of the Space Shuttle and its "close cousin" Buran made this impossible.

Re: SpaceX Starship rocket explodes minutes after launch from Texas

#430
post #128

Earlier quoted context omitted.

Not known, as SpaceX is a private company, and the rocket is still being developed. But I'd say a whole lot less than $2B per launch ;-)

You touch upon an interesting advantage that private space engineering has that, depending on one's attitude on the topic, may or may not be fair. NASA has to do everything in the public eye and their process reflects this. Private enterprise is allowed to hide information, which implies they are allowed to massage information. (... this probably says unfortunate things about the nature of governance by public sentim…

Failing in public is fine. We should encourage failure on the path to success.
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