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Author Topic: SpaceX (general discussion)  (Read 228831 times)

Offline Flyaway

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Re: SpaceX (general discussion)
« Reply #1560 on: March 09, 2019, 07:11:15 am »
SpaceX Prototype moved to launch pad

Quote from: The Brownsville Herald
SpaceX spokesman James Gleeson said in an email that the Starship prototype was moved to the launch pad in preparation for testing, though the public won’t be able to see the first tests.

“SpaceX will conduct checkouts of the newly installed ground systems and perform a short static fire test in the days ahead,” he said. “Although the prototype is designed to perform sub-orbital flights, or hops, powered by the SpaceX Raptor engine, the vehicle will be tethered during initial testing and hops will not be visible from offsite. SpaceX will establish a safety zone perimeter in coordination with local enforcement and signage will be in place to alert the community prior to the testing.”

Offline Flyaway

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Re: SpaceX (general discussion)
« Reply #1561 on: March 11, 2019, 04:07:56 pm »
Tanking Test of the BFH



The first Raptor engine arrived on site today as well.

https://forum.nasaspaceflight.com/index.php?topic=47070.msg1921179#msg1921179
« Last Edit: March 11, 2019, 04:52:34 pm by Flyaway »

Offline fredymac

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Re: SpaceX (general discussion)
« Reply #1562 on: March 14, 2019, 04:12:52 am »
Picture from Musk.

Offline sferrin

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Re: SpaceX (general discussion)
« Reply #1563 on: March 14, 2019, 05:39:19 am »
It looks like it's buried in the ground.  Aren't there any feet on the end of the landing legs?  ???
"DARPA Hard"  It ain't what it use to be.

Offline Flyaway

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Re: SpaceX (general discussion)
« Reply #1564 on: March 15, 2019, 07:11:01 am »

Offline sferrin

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Re: SpaceX (general discussion)
« Reply #1565 on: March 15, 2019, 07:12:13 am »
That's more like it.  That picture in post #1562 looked familiar (from some time ago).
"DARPA Hard"  It ain't what it use to be.

Offline Flyaway

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Re: SpaceX (general discussion)
« Reply #1566 on: March 15, 2019, 10:20:16 am »
The thing people have found curious is why the top half of the Hopper, if that’s what it is that they appear to be building at the moment looks so different to the first one, it looks a lot taller for a start and doesn’t appear to taper as much.

Offline Flyaway

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Re: SpaceX (general discussion)
« Reply #1567 on: March 15, 2019, 03:00:12 pm »
https://twitter.com/austinbarnard45/status/1106646298445467649

Quote
The hopper has multiple tubings and pipes connected to it, while underneath everything is being prepared for the installation of the raptor engine(sitting on the flat bed with a tarp). Meanwhile the white and grey tanks are being fueled up.

Offline Flyaway

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Re: SpaceX (general discussion)
« Reply #1568 on: March 16, 2019, 08:05:55 am »
Installed Raptor on the Hopper. Appears to be a side engine of the proposed three.

https://forum.nasaspaceflight.com/index.php?topic=47120.msg1923406#msg1923406

Engine now moved to the centre, there has been speculation that they are doing fit checks before fitting the other Raptors.
« Last Edit: March 16, 2019, 02:51:30 pm by Flyaway »

Offline sferrin

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Re: SpaceX (general discussion)
« Reply #1569 on: March 17, 2019, 09:51:33 am »
"DARPA Hard"  It ain't what it use to be.

Offline Dragon029

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Re: SpaceX (general discussion)
« Reply #1570 on: March 17, 2019, 03:43:54 pm »
Another deluge of Starship & Starhopper news:

What you see in these images:



Is not part of the Starhopper:

https://twitter.com/elonmusk/status/1107373237208416256?s=20
Quote
We decided to skip building a new nosecone for Hopper. Don’t need it. What you see being built is the orbital Starship vehicle.
And no he doesn't mean an intermediate developmental vehicle:
https://twitter.com/elonmusk/status/1107374051410886656
Quote
Elon Musk:
Quote
Anner J. Bonilla
After hopper planning on going straight to superheavy full size? Or intermediate development vehicle is planned?
Full size

Also, the Starhopper is expected to conduct a static fire and possibly a very short (probably ~1 second, ~1 foot) hop this week:

https://twitter.com/elonmusk/status/1107366178471608321
Quote
Elon Musk
Quote
Viv
Saw this on Reddit, so the first hops are happening next week?
Hopefully. Always many issues integrating engine & stage. First hops will lift off, but only barely.
As for how that'll happen with just 1 Raptor engine delivered to Boca Chica:
Quote
Elon Musk
Quote
Austin Barnard
Do y’all think #SpaceX will attempt some sort of test, With only one raptor or wait for the other two to arrive. It’s honestly been boggling my mind.
First (really short) hops with one engine. Suborbital flights with three.
https://twitter.com/elonmusk/status/1107365369168056320?s=19

And on top of all of that, it seems like Starship will actually still use heatshield tiles:
https://twitter.com/elonmusk/status/1107378575924035584 [video of the tiles being tested - they apparently passed a full duration simulated re-entry test]

As for what happened to the sweating Starship idea:
Quote
Elon Musk
Quote
Some1
I thought you were going with transpiration cooling so you wouldn't have to replace them after each flight. Will this system be the backup for the transpiration cooling, something in addition to the transpiration cooling, or a replacement to it.
Transpiration cooling will be added wherever we see erosion of the shield. Starship needs to be ready to fly again immediately after landing.  Zero refurbishment.

According to Elon, the tiles will be used on the windward side (belly) with transpiration cooling used as mentioned above. It's my understanding that PICA-X operates primarily via ablation, which would therefore require refurbishment at some stage, but perhaps they're going with a thermal soak heat shield instead (and relying on the conductivity and thermal durability of steel to handle any thermal transfer or leaking - the video above shows the panels attached to a steel plate).
« Last Edit: March 22, 2019, 04:40:53 pm by Dragon029 »

Offline Flyaway

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Re: SpaceX (general discussion)
« Reply #1571 on: March 17, 2019, 05:02:09 pm »
To my mind any kind of refurbishment would entirely defeat the point of Starship.

Offline sferrin

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Re: SpaceX (general discussion)
« Reply #1572 on: March 17, 2019, 05:04:02 pm »
To my mind any kind of refurbishment would entirely defeat the point of Starship.

Why?
"DARPA Hard"  It ain't what it use to be.

Offline sferrin

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Re: SpaceX (general discussion)
« Reply #1573 on: March 17, 2019, 05:21:29 pm »
Is not part of the Starhopper:

https://twitter.com/elonmusk/status/1107373237208416256?s=20
Quote
We decided to skip building a new nosecone for Hopper. Don’t need it. What you see being built is the orbital Starship vehicle.
And no he doesn't mean an intermediate developmental vehicle:
https://twitter.com/elonmusk/status/1107374051410886656
Quote
Elon Musk:
Quote
Anner J. Bonilla
After hopper planning on going straight to superheavy full size? Or intermediate development vehicle is planned?
Full size

[TinFoilHatMode] Hmmm almost makes you wonder if Elon knows something. . . [/TinFoilHatMode]
« Last Edit: March 17, 2019, 05:23:13 pm by sferrin »
"DARPA Hard"  It ain't what it use to be.

Offline Dragon029

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Re: SpaceX (general discussion)
« Reply #1574 on: March 17, 2019, 05:44:29 pm »
To my mind any kind of refurbishment would entirely defeat the point of Starship.

Why?
I would disagree that *any* kind of refurbishment defeats the point of Starship (I think something like a refurbishment after 10+ interplanetary re-entries would be fine), but Starship is meant to provide ridiculously low $ per mass payload capacity via full reusability (Elon's said he thinks it can very feasibly be cheaper per launch (not just per kg) than a Falcon 9, despite having vastly more payload capacity), so any form of refurbishment (other than something involved in a service life extension program after something like 100 re-entries) will increase costs, potentially to the point where it's not as attractive for launching non-ride-sharing satellites as Falcon 9.