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Author Topic: SpaceX (general discussion)  (Read 203141 times)

Offline sferrin

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Re: SpaceX (general discussion)
« Reply #1260 on: October 08, 2018, 08:05:40 am »
it seems an oleo didn't function properly

IIRC this happened on one other landing as well.  Good thing there is enough margin of stability not to tip over.  :o
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Offline NeilChapman

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Re: SpaceX (general discussion)
« Reply #1261 on: October 08, 2018, 09:38:44 am »

Makes me wonder about BFS tripod landing.  How will they compensate for uneven surfaces if there are issues on a dead-level concrete pad?


Offline sferrin

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Re: SpaceX (general discussion)
« Reply #1262 on: October 08, 2018, 10:57:17 am »

Makes me wonder about BFS tripod landing.  How will they compensate for uneven surfaces if there are issues on a dead-level concrete pad?

What are the "issues"?  That a leg didn't fully deploy had nothing to do with the surface.
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Offline TomcatViP

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Re: SpaceX (general discussion)
« Reply #1263 on: October 08, 2018, 12:23:01 pm »
I am sure that they have enough margin on tilting angle to make this a secondary (or more) issue. We have to realize that the thing keep only enough fuel to land; hence the CG might be very low (completing what Sferrin just said).
« Last Edit: October 08, 2018, 12:30:37 pm by TomcatViP »

Offline Machdiamond

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Re: SpaceX (general discussion)
« Reply #1264 on: October 08, 2018, 02:19:22 pm »
I believe that Falcon landed perfectly straight, the tilting angle may be due to the rocket being off center a wide angle lens.

BFS tripod stability on unprepared surfaces is certainly a valid concern. If I was wearing a SpaceX tee shirt, I would work on BFS having the ability to immediately hop a short distance away for another landing attempt before any excessive tilt is reached. The lower Mars gravity and sheer size of BFS makes this all happen in slow motion anyway, so it is not as far fetched as if you were trying to do that on Earth.

Offline TomS

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Re: SpaceX (general discussion)
« Reply #1265 on: October 08, 2018, 02:40:20 pm »
The leg mechanism in the BFS will have to be different from the F9 anyway.  For starters, there are mission profiles where it will need to work twice, once on Mars and again back on Earth.  So I assume the BFR version is retractable and offers more range of adjustment than the F9 legs.  It probably won't rely on a crush core like F9 does.

Offline Flyaway

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Re: SpaceX (general discussion)
« Reply #1266 on: October 15, 2018, 12:36:19 pm »
Elon Musk pegs SpaceX BFR program at $5B as NASA’s rocket booster nears $5B in cost overruns

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During a September 17th update to the next-gen SpaceX rocket’s steady progress, CEO Elon Musk offered a rough cost estimate of $5B to complete its development – no less than $2B and no more than $10B. According to NASA’s Office of the Inspector General (OIG), Boeing – primary contractor for NASA’s SLS “Core Stage” or booster – is all but guaranteed to burn through a minimum of $8.9B between 2012 and the rocket’s tentative 2021 launch debut.

https://www.teslarati.com/elon-musk-spacex-bfr-nasa-rocket-over-budget/

Offline TomcatViP

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Re: SpaceX (general discussion)
« Reply #1267 on: October 15, 2018, 04:29:26 pm »
Being serious to reach that goal will probably trigger vivid discontentement among the industry (abroad and in the US).

One remark although: this is probably marking the end of the segregated systems responsibility, a policy that has led the Space industry since its early soaring and expansion during the cold war. SpaceX being the only (mostly) competitor that embraces all of the key competencies in their design.

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Mr. J. Leland Atwood (North American Aviation CEO) discussing NAA early space effort:

the Secretary of the Air Force was man named Harold Talbott who was from Dayton, and I guess his family was a very strong Dayton group, and they were part of the Dayton-Wright airplane organization during World War I and so forth. Harold Talbott was a pretty gutsy type, and he had his ideas of how the industry ought to be organized, and aircraft people were starting to make fringe items like accessories for airplanes, and he didn't like it.

    He passed an edict, in other words, that airplane makers were going to stick to airplanes, engine makers were going to stick to engines, and people who made the radios and starters were going to stick to their business. It was really quite dogmatic, and could hardly have been propagated these days, but in the days after the war, wartime control and mobilization still had fairly strong overtones, I guess.

Offline sferrin

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Re: SpaceX (general discussion)
« Reply #1268 on: October 15, 2018, 04:35:26 pm »
Being serious to reach that goal will probably trigger vivid discontentement among the industry (abroad and in the US).

Could you elaborate?
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Offline TomcatViP

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Re: SpaceX (general discussion)
« Reply #1269 on: October 15, 2018, 04:42:56 pm »
the business model of some will then look questionable forcing them to react to still appear relevant to their backer; the public.

Think fighter jets.

Offline fredymac

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Re: SpaceX (general discussion)
« Reply #1270 on: October 16, 2018, 09:16:06 am »
Not really any specific thread for this so I'll park it here.

edit: looks like they don't want to share it.  Just right click the video to get the URL.

« Last Edit: October 16, 2018, 09:18:46 am by fredymac »

Offline Flyaway

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Re: SpaceX (general discussion)
« Reply #1271 on: October 23, 2018, 12:44:57 am »
SpaceX lines up five launches to close out 2018

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SpaceX’s launch manifest for the remainder of 2018 is beginning to take shape. The company has five launches remaining on its schedule for the year. Executing all of them would take SpaceX’s 2018 launch total to 22 – surpassing the launch provider’s previous record of 18 launches in a single year.

The next mission on SpaceX’s manifest is Es’hail 2. Scheduled for no earlier than November 14th, a Falcon 9 will launch the communications spacecraft from Pad 39A at Kennedy Space Center for the Qatar Satellite Company.

Offline sferrin

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Re: SpaceX (general discussion)
« Reply #1272 on: October 23, 2018, 07:44:53 am »
If they pull off 5 in the rest of the year I'll be surprised.  They seem to be plagued with delays. 
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Offline Tuna

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Re: SpaceX (general discussion)
« Reply #1273 on: October 23, 2018, 07:59:06 am »
If they pull off 5 in the rest of the year I'll be surprised.  They seem to be plagued with delays.

Lately the delays have been all about the payloads. They used to have a lot of SpaceX-caused delays, and it seems that a lot of their customers learned that the deadlines given are very flexible and you don't need to be awfully strict about your own work because the rocket will not be ready anyway. Now that reuse finally works and they have a lineup of half a dozen launchers ready to launch whenever, and the customers go "oops, our satellite is not even close to ready".

It'll clear out given a little time.

Offline Flyaway

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Re: SpaceX (general discussion)
« Reply #1274 on: October 24, 2018, 11:23:01 pm »
SpaceX official says company about to launch a Falcon 9 for the third time

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"We've launched Falcon 9 over 60 times," Hoffman said at the Wernher von Braun Memorial Symposium on Wednesday afternoon. "We've landed our first stage booster 30 times now. And relaunched 16 times. We're about to relaunch a booster for the third time. So we're turning this into routine access to space. High-reliability, higher-performance, lower-cost access to space; that opens it up to everybody."