SpaceX News

Point out news stories, on the net or in mainstream media, related to polywell fusion.

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kcdodd
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Location: Austin, TX

Re: SpaceX News

Post by kcdodd »

Last I heard they were not going to try any recovery this time.
Carter

mvanwink5
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Location: N.C. Mountains

Re: SpaceX News

Post by mvanwink5 »

No first stage return as it was not part of this launch. Too much fuel required to achieve Geo. February 2014 is when the next first stage return is planned.
Near term, cheap, dark horse fusion hits the air waves, GF - TED, LM - Announcement. The race is on.

Skipjack
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Joined: Sun Sep 28, 2008 2:29 pm

Re: SpaceX News

Post by Skipjack »

I think the fuel was not really the problem. From what I understand SpaceX had to make some concessions to their early customers. Elon mentioned something in a tweet he made. So they could have tried to recover, but were contractually not allowed in this flight and the next one. They will try again with CRS3.

KitemanSA
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Location: OlyPen WA

Re: SpaceX News

Post by KitemanSA »

Maui wrote:I was hoping to see news of whether they had better luck with a controlled return of the first stage this time, but can't see any mention of it. Anyone know if they attempted it for this launch?
Not even close. The recent experience was only 2600(?) feet.

mvanwink5
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Location: N.C. Mountains

Re: SpaceX News

Post by mvanwink5 »

K,
I think you sold the effort a bit short. SpaceX did a controlled burn to allow safe reentry (worked) and reignited for the final controlled decent, but spin of the first stage allowed by not having the future landing gear caused the fuel to pump suctions to be mucked up. At east that is my understanding.
Best to you (and all on this board) and families during this holiday season.
Near term, cheap, dark horse fusion hits the air waves, GF - TED, LM - Announcement. The race is on.

Skipjack
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Joined: Sun Sep 28, 2008 2:29 pm

Re: SpaceX News

Post by Skipjack »

I am not sure whether Kite referred to the Cassiope launch or the SES8 launch. The Cassiope launch had a recovery attempt. That attempt went pretty well. They were able to do a controlled descent of the stage. Unfortunately the stage started to spin at a rate that could not be compensated by the cold gas thrusters. The centrifugal force caused by the spin caused the fuel to drift away from the fuel lines and thus cut the final braking burn short. Because of this the stage could not be slowed down enough to survive the impact into the ocean. SpaceX did release a picture of the intact stage splashing into the water though. So they did come really close this time already (not bad for a first try).
SpaceX assumes that they can fix the spinning in several ways. One assumption is that the landing legs (which were not on the Cassiope flight, but will be on future flights with stage recovery attempts), will provide enough mass and drag to reduce spinning. They are probably going to do some other measures to completely remove the spin. In addition they seem to be working on some additional anti slosh measures inside the tank.
On the SES8 launch and the upcoming Thaicom launch, there wont be any first stage recovery attempts. The contracts with the clients prohibit it. SpaceX had to make some concessions because their launch vehicle is new and has no real savety record yet. Because of that the client required that all fuel and performance reserves be used only for their vehicle. From various vidoes it seemed however that SpaceX stll did some testing with the cold gas thrusters of the first stage after staging, probably to check how well they could control the attitude of the stage without the help from the main engines. I assume that they will do the same on the upcoming Thaicom launch.

Maui
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Location: Madison, WI

Re: SpaceX News

Post by Maui »

I think Kite was referring to the grasshopper tests and not the first stage controlled return attempts.

Betruger
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Joined: Tue May 06, 2008 11:54 am

Re: SpaceX News

Post by Betruger »

Sometimes you'd think Musk is just playing one of those Civilization video games. Morbid as it might be, I've got this admittedly paranoid nagging feeling that it's all too hinged on a single failure point: Elon Musk himself.
You can do anything you want with laws except make Americans obey them. | What I want to do is to look up S. . . . I call him the Schadenfreudean Man.

Carl White
Posts: 334
Joined: Mon Aug 24, 2009 10:44 pm

Re: SpaceX News

Post by Carl White »

Betruger wrote:Sometimes you'd think Musk is just playing one of those Civilization video games. Morbid as it might be, I've got this admittedly paranoid nagging feeling that it's all too hinged on a single failure point: Elon Musk himself.
He's still relatively young. Give him at least fifteen years before he drops from a heart attack.

Skipjack
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Joined: Sun Sep 28, 2008 2:29 pm

Re: SpaceX News

Post by Skipjack »

You can have a heart attack in your early 30ies, trust me... So age is not necessarily a requirement for a heart attack.
Btw, Grasshopper2 is now undergoing some early low altitude tests in McGregor.
https://drive.google.com/folderview?id= ... W5Xc25Bd0E

GIThruster
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Joined: Tue May 25, 2010 8:17 pm

Re: SpaceX News

Post by GIThruster »

"Courage is not just a virtue, but the form of every virtue at the testing point." C. S. Lewis

Maui
Posts: 577
Joined: Wed Apr 09, 2008 12:10 am
Location: Madison, WI

Re: SpaceX News

Post by Maui »

Man, yet another launch attempt scrubbed today. I realize this is the first that sounds like it is on SpaceX, but at this rate they are going to be lucky to get 4 launches this year, let alone 15.

mvanwink5
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Joined: Wed Jul 01, 2009 5:07 am
Location: N.C. Mountains

Re: SpaceX News

Post by mvanwink5 »

Sabotage, not enough attention to detail, unlucky, or just careful? For sure the radar failure delay was due to budget cuts that trimmed down to the one critical radar with no back up, then there was the previous delay due some greasy stuff in the unpressurized cargo area, and other delays I am unsure of. Whatever the reasons, SpaceX is not making money this way...
Near term, cheap, dark horse fusion hits the air waves, GF - TED, LM - Announcement. The race is on.

GIThruster
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Joined: Tue May 25, 2010 8:17 pm

Re: SpaceX News

Post by GIThruster »

Grasshopper 1 about to go for testing on return from a real launch. . .truly an historic flight:

http://www.nasaspaceflight.com/2014/04/ ... ilestones/

Even if it crashes this will be a success, so long as Dragon makes it to ISS.
"Courage is not just a virtue, but the form of every virtue at the testing point." C. S. Lewis

Skipjack
Posts: 6106
Joined: Sun Sep 28, 2008 2:29 pm

Re: SpaceX News

Post by Skipjack »

GIThruster wrote:Grasshopper 1 about to go for testing on return from a real launch. . .truly an historic flight:

http://www.nasaspaceflight.com/2014/04/ ... ilestones/

Even if it crashes this will be a success, so long as Dragon makes it to ISS.
Uhm, this is not Grasshopper 1 and not F9R 1 (Grasshopper 2) either, which is in McGregor right now doing hover tests. A report about its first flight just surfaced here:
http://www.wacotrib.com/blogs/joe_scien ... f887a.html

This is a full F9 1.1 (sometimes also referred to as F9R or reusable F9) and it is their second attempt at a controlled splash down. The first attempt was on the Cassiope launch and the stage made it down intact until an uncontrollable roll caused the engines to run out of fuel and shut down a few meters above ground. The legs on this flight will act as fins to prevent the roll (together with improved slosh baffles). They will also test the leg extension mechanism on this flight and how leg extension performs during the landing burn. Right now I just hope they finally manage to get the bird off the ground. Its been delayed for 4 months now.

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