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Posted by3 months ago

Spacex Booster 7 ignition test?

98% Upvoted
level 1
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level 1
· 3 mo. ago · edited 3 mo. ago

The explosion is so quick that it seems like something might have already leaked out before the blast. Like fuel was already in the air before ignition

More angles and sound:

level 2

I wonder how hard/possible it would be to make an open-air gas chromatography–mass spectrometer to detect this. I'm imagining a handful of lasers crisscrossing the volume beneath/around the booster.

Maybe it would be simpler to do what people mentioned about other boosters, and just make sure there's something that causes leaks to get burnt off before they can accumulate.

level 2

There's something in the air tonight.

level 2

They did a full spin up test of the turbopumps before, where more fuel is exhausted unburned. They want to do this tests in the future without all 33 engines at the same time.

level 2

Damnit Tory!

level 2

It doesn't sound like an engine start sequence, but the bang makes me think whatever was coming out was in a good air fuel mix for an explosion to occur.

level 2

Looks like the flame originated from the engine section and move towards the ground. I think it's mostly from the giant gas release right before the flame.

level 2

Also afterwards. How black the fire ploom and smoke was doesnt look healthy

level 2

They call that sort of thing a "hot start" in the aviation world


2 more replies

level 1

That did not look nominal.

level 2

Yeah, actually not good. Team is assessing damage.

level 2

Nor did it appear norminal

level 2

Looks like the fuel failed to ignite until too late

level 2

I think this is what they call a "hard start."

Methane is a good deal lighter than air, and it is easily ignited. Delta IV launches usually are wreathed in burning hydrogen. ULA does something to make sure the leaking hydrogen during the start sequence is burnt in a relatively safe manner, and that it does not get into confined spaces and explode. This looks like a similar problem, that might require a similar solution.

level 2

I know it wasn't normal, but it looked as expected to me. Aerosol a fuel in the air, provide a spark, and boom. All engines do this. This was just 33x bigger boom.


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Created Aug 22, 2011




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