SpaceX News

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

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Maui
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Re: SpaceX News

Postby Maui » Sun Apr 21, 2019 5:56 pm

?? This is the demo Dragon II capsule

paperburn1
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Re: SpaceX News

Postby paperburn1 » Sun Apr 21, 2019 6:19 pm

Very few official words at the moment, the following reconstruction of events is based on multiple but not official sources. On 20th April, at the Dragon test stand near Landing Zone-1 Cape Canaveral Air Force Station (CCAFS), SpaceX static and ground tested the Crew Dragon capsule C201, previously flown on CCtCap Demo Mission 1, ahead of its In Flight Abort test previously scheduled later this year. During the morning SpaceX succesfully tested the spacecraft's Draco maneuvering thrusters. Later the day SpaceX was preparing for a static firing if the capsule's Super Draco launch escape thrusters. At about T-9 seconds, SpaceX experienced a serious anomaly which resulted an explosive event and the total loss of the vehicle and the test equipment. Local reporters shortly reported an orange/red/brown coloured smoke plume, presumably caused by released toxic hypergolic fuel which is the propellant for the Super Draco engines. According to official words nobody injured and the released propellant was treated.

SpaceX released a short press release: "Earlier today, SpaceX conducted a series of engine tests on a Crew Dragon test vehicle on our test stand at Landing Zone 1 in Cape Canaveral, Florida. The initial tests completed successfully but the final test resulted in an anomaly on the test stand. Ensuring that our systems meet rigorous safety standards and detecting anomalies like this prior to flight are the main reason why we test. Our teams are investigating and working closely with our NASA partners."
I am not a nuclear physicist, but play one on the internet.

paperburn1
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Re: SpaceX News

Postby paperburn1 » Sun Apr 21, 2019 6:47 pm

There is a download on Google documents and you can reach the link on the Reddit space X forum that someone is broken down the explosion into 200 clips in PNG format. Detail is very grainy and unfortunately at the rate of explosion it only takes three frames to cover the entire craft. It is obvious the explosion started at the top of the craft and blew downward and outward. One frame shows a black object in front of the explosion shooting downward but that might be an anomaly in processing of the image. Hopefully they will have had is high-speed camera running at the time of the explosion in space X will know more although I doubt they will release any information about the mishap.
I am not a nuclear physicist, but play one on the internet.

Maui
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Re: SpaceX News

Postby Maui » Sun Apr 21, 2019 7:52 pm

COPV episode 3? Does this use COPVs? Thread on Reddit suggested it did?

paperburn1
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Re: SpaceX News

Postby paperburn1 » Mon Apr 22, 2019 3:34 am

The engines burn hypergolic propellants—monomethylhydrazine is the fuel while nitrogen tetroxide is the oxidizer. These are fairly toxic compounds, but unlike other "cleaner" rocket fuels, they are more easily storable both on the ground and in space. COPV seem to fail when exposed to cryogenic temperature due to the differences in the expansion rate of the liner verses the over wrap. I think these are stored at ambient temperature and tanks are pressurized with helium gas making the tanks less of a problem , These motor are designed for long term storage of propellant and armored around the motor to contain a motor explosion. So such a catastrophic failure that does point at the tanks and valving leaking before the event takes place.I can't imagine corrosive oxidizer was entirely to blame : Dragon has to be docked to the ISS for months on end, surely they wouldn't have overlooked that? Maybe something to do with sea water contamination, I just hope they had a high speed camera running as this one is going to be a bother to figure out what went wrong
I am not a nuclear physicist, but play one on the internet.

paperburn1
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Re: SpaceX News

Postby paperburn1 » Mon Apr 22, 2019 4:51 am

Back to Apollo days :
Three of those failed while they were installed in the spacecraft, two during a system test, and one, of course, was Apollo 13, as everybody is probably familiar.
Others failed during acceptance or qualification tests due to:
Stress corrosion cracking from red nitrogen tetroxide
Weld cracks and embrittled weld repairs
Stress corrosion cracking from water (steel motor case)
Sustained load crack growth in water (growth of an existing crack due to exposure to water)
I am not a nuclear physicist, but play one on the internet.

paperburn1
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Re: SpaceX News

Postby paperburn1 » Mon Apr 22, 2019 8:11 am

One final bit of info. SuperDraco is derived from Draco, and utilizes the same storable (non-cryogenic) propellant as the small Draco thrusters, but are over 100 times larger in terms of delivered thrust.
The Draco thrusters were tested earlier in the day
No conclusions or correlations just facts to consider.
I am not a nuclear physicist, but play one on the internet.

paperburn1
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Re: SpaceX News

Postby paperburn1 » Wed Apr 24, 2019 8:21 pm

@NASA statement from today: "SpaceX and NASA are just beginning the mishap investigation process. We don’t yet know what impact this will have to our target schedules. We have full confidence in SpaceX. Additional information will be released as it is available."
I am not a nuclear physicist, but play one on the internet.

williatw
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Re: SpaceX News

Postby williatw » Wed May 15, 2019 9:37 pm

SpaceX Was Secretly Building a Second Starship in Florida


Image

Doubling Down

In a bid to reach the Moon as quickly as possible, SpaceX is building a second Starship.

The company is already building and testing one Starship in Texas, but decided to build another in Florida to determine which site is better suited for the task, according to Engadget. By developing a second construction site for Starships, SpaceX is effectively racing against itself to figure out the best way to bring crews and passengers up into orbit.

Spotted

News broke of the second spacecraft after someone stumbled across the construction site and posted about it on a forum, per Engadget. In response, CEO Elon Musk took to Twitter and confirmed that SpaceX was building Starships in two different states.

Musk went on to explain that the two teams were competing to determine the best way to build Starships, but that they’re required to share insights with each other and that both sites may end up mass-producing the spacecraft in the future.

“Both sites will make many Starships,” Musk tweeted. “This is a competition to see which location is most effective. Answer might be both.”




https://futurism.com/the-byte/spacex-bu ... ip-florida

Skipjack
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Re: SpaceX News

Postby Skipjack » Wed May 15, 2019 10:38 pm

Starlink conference call reports on Twitter right now. All I can say is "Holy Smokes!" Between Starlink and Starship, SpaceX is innovating at a pace that is unprecedented in the space business.

choff
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Re: SpaceX News

Postby choff » Thu May 23, 2019 3:14 am

CHoff


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