Previous in Forum: Is it Possible to Make a Button Head Machine Screw a Certain Size/Gram Weight?   Next in Forum: Electrically Powered Aircraft - Again
Close
Close
Close
15 comments
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 30970
Good Answers: 1727

SpaceX Plans to Fly Again

01/02/2017 1:07 PM

..."In its statement, SpaceX said it traced the cause to a pressure vessel in the second-stage liquid oxygen tank. The tank buckled, the company said, and supercooled liquid oxygen pooled in the lining. The fuel was ignited by breaking fibers or friction.

The company said that in the short term, it plans to change the way it loads fuel. Eventually, it plans to change the design of the pressure vessels to prevent buckling."...

Maybe they could layer in some graphene sheets....?

http://www.parabolicarc.com/2014/04/05/composite-tank/

https://www.washingtonpost.com/news/the-switch/wp/2017/01/02/elon-musks-spacex-says-it-has-found-cause-of-rocket-explosion-and-plans-to-fly-again-sunday/?utm_term=.3e3c53282452

http://www.spaceflightinsider.com/organizations/space-exploration-technologies/spacex-narrows-cause-falcon-9-explosion-targets-mid-december-launch/

http://www.laserndt.com/technology/ndtapplications/copvtanks.htm

__________________
Break a sweat everyday doing something you enjoy
Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 30970
Good Answers: 1727
#1

Re: SpaceX plans to fly again

01/02/2017 1:20 PM
__________________
Break a sweat everyday doing something you enjoy
Reply
Guru

Join Date: Feb 2011
Posts: 7045
Good Answers: 206
#2

Re: SpaceX plans to fly again

01/02/2017 2:34 PM

Look for a repeat

Reply
Guru

Join Date: Sep 2016
Posts: 930
Good Answers: 9
#11
In reply to #2

Re: SpaceX plans to fly again

01/03/2017 1:39 AM

Something to watch again and again, right Fred?

Maybe they start building an electrically powered rockets if its possible.

Reply Score 1 for Off Topic
Guru

Join Date: Feb 2013
Posts: 2004
Good Answers: 29
#12
In reply to #11

Re: SpaceX plans to fly again

01/03/2017 8:13 AM

1. Will the 13 Amp extension lead comply with the IEEE/IEC standards?

2. And if so, who's job is it to wind it up again?

3. If battery powered, do they get a pink rabbit with each set of batteries purchased?

4. Why not just reverse gravity and let it float up, give it a little nudge to get started.

Reply
Guru
Engineering Fields - Power Engineering - New Member

Join Date: May 2007
Location: NYC metropolitan area.
Posts: 3231
Good Answers: 444
#3

Re: SpaceX plans to fly again

01/02/2017 3:48 PM

Maybe they shouldn't rely on design information from posters on CR4!!!

__________________
“Tell me and I forget. Teach me and I remember. Involve me and I learn.” Ben Franklin.
Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 30970
Good Answers: 1727
#4
In reply to #3

Re: SpaceX plans to fly again

01/02/2017 4:31 PM

Why not? I haven't blown anything up ....and in case I haven't said it lately, I can fix anything......

__________________
Break a sweat everyday doing something you enjoy
Reply
Guru

Join Date: Dec 2016
Posts: 2914
Good Answers: 115
#5

Re: SpaceX plans to fly again

01/02/2017 5:25 PM

"Maybe they could layer in some graphene sheets....?"

I dunno, it's strong stuff but I'd be leery of using graphene in a tank designed to hold LOX, even if the layers were buried inside laminations.

Graphene is pretty chemically reactive overall but especially along its edges. Extremely reactive. A crack or tear could expose those edges to pure oxygen and no telling but the thing could catch fire and we'd get a repeat performance.

Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 30970
Good Answers: 1727
#6
In reply to #5

Re: SpaceX plans to fly again

01/02/2017 8:19 PM

Perhaps they could stabilize the graphene....

reference

__________________
Break a sweat everyday doing something you enjoy
Reply
Guru

Join Date: Dec 2016
Posts: 2914
Good Answers: 115
#8
In reply to #6

Re: SpaceX plans to fly again

01/02/2017 11:46 PM

Makes one wonder, though, after the stabilisation is it still graphene with all of graphene's properties of strength and so forth? I don't know.

Given that this is a LOX tank, especially, I would not be inclined to make it using carbon-based materials. Spun fibreglass, maybe; depends on how it responds to cryogenic temps. But if the stuff burns, I wouldn't use it anywhere near pure oxygen. That's asking for trouble.

Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 30970
Good Answers: 1727
#9
In reply to #8

Re: SpaceX plans to fly again

01/03/2017 12:07 AM

Well the carbon fiber wound tanks are much stronger at the low temperatures required....I would also think the carbon fiber tank could be grounded easier or more effectively than fiberglass....there is a problem with microcracking with all composites I think due to the rigidity of the structure at such low temps...so I think that is the main problem... adding some flexibility is a challenge....a self-healing fiber maybe...

http://scholarworks.uno.edu/cgi/viewcontent.cgi?article=1169&context=td

__________________
Break a sweat everyday doing something you enjoy
Reply
Guru

Join Date: Apr 2011
Posts: 7959
Good Answers: 284
#10
In reply to #9

Re: SpaceX plans to fly again

01/03/2017 12:45 AM

Kevlar and Twaron are notably strong at cryogenic temps.

__________________
Eternal vigilance is the price of knowledge. - George Santayana
Reply
Guru

Join Date: Apr 2011
Posts: 7959
Good Answers: 284
#7

Re: SpaceX Plans to Fly Again

01/02/2017 11:04 PM

"...The tank buckled..."

? Maybe the original fueling procedure had a vacuum drawn on the tank prior to filling with LOX?

__________________
Eternal vigilance is the price of knowledge. - George Santayana
Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 30970
Good Answers: 1727
#13
In reply to #7

Re: SpaceX Plans to Fly Again

01/03/2017 12:15 PM

Or possibly the LOX tank pressure exceeded the helium tank pressure. If these tanks are designed for internal pressure (and not much at that), what would be the pressure differential limit externally?

__________________
Break a sweat everyday doing something you enjoy
Reply
Guru

Join Date: Oct 2014
Location: Hemet, Land of milk and honey.
Posts: 2366
Good Answers: 36
#14

Re: SpaceX Plans to Fly Again

01/03/2017 11:26 PM

I can't see what the big deal is, every manufacturing operation has an acceptable degree of waste, why else would anyone buy Brooms and dustpans.

Reply
Guru

Join Date: Apr 2011
Posts: 7959
Good Answers: 284
#15
In reply to #14

Re: SpaceX Plans to Fly Again

01/04/2017 2:01 AM

"...why else..."

The Broom is the preferred means of personal transportation for some....their husbands are typically relegated to following on the dustpan.

__________________
Eternal vigilance is the price of knowledge. - George Santayana
Reply
Reply to Forum Thread 15 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Copy to Clipboard

Users who posted comments:

Andrew Westman (2); Fredski (1); gutmonarch (1); IQ (1); RAMConsult (1); SolarEagle (5); tonyhemet (1); truth is not a compromise (3)

Previous in Forum: Is it Possible to Make a Button Head Machine Screw a Certain Size/Gram Weight?   Next in Forum: Electrically Powered Aircraft - Again

Advertisement