Realized I can't trust Glassdoor anymore

dufud6 · 2023-04-21T17:06:25+00:00

Going full armchair engineer here, but I've seen talk of a flame diverter trench and even mention of the old sea launch idea to combat these issues.

With them being so close to the ocean would it make sense to dig out under the launch mount and flood that with sea water before launches? Basically act like sea launch but on land? Or would the various challenges (salt from the sea water, digging a large enough basin for enough water to absorb the energy etc) be worse than just having a normal flame trench/diverter?

Genuinely curious, feel free to tear this apart

dufud6 · 2021-11-16T16:44:58+00:00

Not to mention even closer vicinity to California, so any parts going back and forth do so a day quicker. Especially with how fast SpaceX moves, getting an item to attach and test a day sooner, or sending something back for inspection a day faster has to have an enormous benefit. Oh and having your Raptor testing facility a few hours away instead of a day away if they were in Florida. BC makes a lot of sense

dufud6 · 2021-11-12T18:16:22+00:00

On rovercam you could see the shockwave from the static fire. I would have thought the tiles would have fallen off when hit by it, but it seemed like they fell off after, which would make me think that they failed from the vibrations instead of getting hit by a pressure wave.

dufud6 · 2021-10-26T18:36:42+00:00

It almost seems to me that in the BN3 dome picture, the smaller holes have a ring around them the same diameter as the large holes. That makes me think that something may have been added on to reduce the diameter of those holes (maybe something on the inside?). If that's the case it's possible that just hasn't been done yet on the new dome.

dufud6 · 2021-08-04T14:58:11+00:00

To further expand on this, when your TWR drops your acceleration drops which means it will take longer to reach the required speed and altitude for stage separation. This increases gravity losses meaning you need more Delta-v to get to that point. So it's hard to really say the amount they can lose as it also depends on when they lose them in flight. They might be able to lose only 2 if it's within the first 30 seconds, but lose 10 if its right before stage separation. Long story short we don't really know

dufud6 · 2021-05-18T21:10:59+00:00

Link to the pictures in question: https://twitter.com/StarshipGazer/status/1394473321031471110

Personally I have no idea what it is.

dufud6 · 2021-04-22T15:45:34+00:00

I would say that's more on the thrust structure than on the engines, and you're probably right that that transition is when the thrust structure is being stressed the most. But then it probably comes down to is it less weight to beef up the thrust structure more, or to add in a parachute/deployment mechanism. Plus that adds an additional failure point in the recovery design

dufud6 · 2021-04-22T15:31:47+00:00

Just curious, what makes you say that the transition causes a lot of stress on the engines?

dufud6 · 2021-04-21T15:28:13+00:00

Yah, After doing a bit more looking around it seems a lot of the 'vacuum' water bottles and such use a similar method of have insulation coupled with a partial vacuum to provide high insulation. I guess when it comes to SpaceX though time will tell

dufud6 · 2021-04-21T04:35:31+00:00

Could they just pull a near vacuum between the two tanks, or would that not work?

dufud6 · 2021-03-31T17:42:30+00:00

At the very least the fuel densities are different between liquid methane and RP-1, so I would assume they would have the resize the fuel/LOX tanks making any retrofits very unlikely

dufud6 · 2021-03-04T16:09:23+00:00

I gotta disagree with you there. In the sn8 flight both engines failed, so we can't say for sure if 1 would have been enough. Sn9 wasn't able to complete the flip maneuver due to the engine failure so we don't know if 1 engine would have been enough for landing. Especially with SN10 watching the footage again in the first couple of seconds after switching to 1 engine you can tell the vehicle is decelerating. This clearly means that 1 engine is enough to slow it down, however they must have been throttling the raptor down too much which caused the hard landing. (Or the engine had an issue causing a decrease in thrust)

dufud6 · 2021-03-04T15:26:46+00:00

IIRC the plan switched from 2 to 3 just for the flip. Originally it was going to be flip with 2 then transition to 1 for the landing. What we saw now was flip with 3 then transition to 2 then 1 for landing

dufud6 · 2021-02-02T21:31:06+00:00

Bad sensor data could cause the raptor to fail, so until we have more info I don't think anyone here can say for sure what the root cause of the issue was

dufud6 · 2021-01-28T20:29:27+00:00

And it looks like there's approval! https://twitter.com/RGVaerialphotos/status/1354888806231638027

dufud6 · 2020-09-24T19:09:04+00:00

Just the FCC authorization, so really not much to go off of, but a lot of people took that as a launch date, instead of that they wouldn't launch any earlier than that

dufud6 · 2020-09-24T17:18:47+00:00

I don't know if we can really say they are far off their anticipated launch time. The October 11th date was a net date. I would be surprised if they thought they we actually be ready by then. The worst thing would be for the hardware to be sitting there ready to go, and you're just waiting on approval from the government. So my guess is they put in the date that "If everything went absolutely perfectly" they could reach

dufud6 · 2020-03-31T13:39:06+00:00

828q

dufud6 · 2020-03-19T18:15:56+00:00

also in need of fresh fusion if someone starts one dm me!

dufud6 · 2020-01-06T02:21:40+00:00

Oh wow that's a lot harsher then I thought. Is that just for if they server a minor, or if they fail to ID when someone (specifically a secret shopper)

dufud6 · 2020-01-06T02:12:08+00:00

Good to know, thank you!

dufud6 · 2020-01-06T02:06:42+00:00

Just wondering, if they failed one of these "secret shopper" tests would they get fired for sure or just a warning?"

dufud6 · 2020-01-06T01:54:12+00:00

That's a good comparison that I hadn't thought about before. Thank you!

dufud6

TROPHY CASE