Author Topic: SpaceX Dragon V2 Updates and Discussion  (Read 667798 times)

Offline jacqmans

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1180 on: 06/25/2016 12:54 pm »
The first test article of a SpaceX Crew Dragon undergoes structural load testing to demonstrate the spacecraft’s ability to withstand the tremendous forces it’s exposed to during space flight. The backbone of Crew Dagon is a metallic welded pressure vessel. SpaceX has completed manufacturing of the first two pressure vessels to be used for ground testing, and is currently manufacturing two Crew Dragon flight articles. Photo credit: SpaceX
Jacques :-)

Offline dror

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1181 on: 06/25/2016 07:06 pm »
Is it time to rename this thread, "Crew Dragon Updates and Discussion"? The "V2" terminology appears to have disappeared entirely from Musk's/ SpaceX's lexicon.

Like the purple hatch BTW, very festive.
...
SpaceX or NASA's captions used "Dragon 2" as a generic family name of the vehicles. "Crew Dragon" and "Red Dragon" are, thus, variants of the model.
...

There may also be an unmanned "Cargo Dragon 2" version, so "Crew Dragon" may not be correct
Space is hard immensely complex and high risk !

Offline ScottMC

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1182 on: 06/26/2016 08:14 pm »
Looks slightly lengthened, no?
Side-by-side comparison.  Dragon 1 pressure vessel on the left, Dragon 2 on the right

Credits to SpaceX:
http://www.spacex.com/news/2013/02/12/dragonfalcon-9-update
https://twitter.com/SpaceX/status/746052988964200448

The angles are different but I agree that base does appear slightly lengthened compared to the Dragon 1 pressure vessel.  The round window might be larger too.

Edit: shortened quote to clarify what I'm responding to.  Simply a photo comparison between Dragon 1 and Dragon 2 pressure vessels :)
« Last Edit: 06/26/2016 08:46 pm by ScottMC »

Offline guckyfan

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1183 on: 06/26/2016 08:22 pm »
I am sure they have not redesigned the shape of the pressure vessel since the pad abort. If I remember correctly it was mentioned though, that the amount of fuel would be increased. But that too was decided before the pad abort.

Offline yokem55

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1184 on: 06/27/2016 12:15 am »
I am sure they have not redesigned the shape of the pressure vessel since the pad abort. If I remember correctly it was mentioned though, that the amount of fuel would be increased. But that too was decided before the pad abort.
From what I remember, the pad abort article was was a dragon 1 pressure vessel with a dragon 2 outer mold line, so the differences could entirely be chalked up to that...

Offline guckyfan

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1185 on: 06/27/2016 03:56 am »
I am sure they have not redesigned the shape of the pressure vessel since the pad abort. If I remember correctly it was mentioned though, that the amount of fuel would be increased. But that too was decided before the pad abort.
From what I remember, the pad abort article was was a dragon 1 pressure vessel with a dragon 2 outer mold line, so the differences could entirely be chalked up to that...

I probably was not clear enough. That's what I meant. The pressure vessel on the abort test was old. But the design of the new one was already done and not changed because of the outcome of the pad abort. Which would probably mean that fuel for the abort was more limited then it will be on the real crew Dragon.

Offline darkenfast

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1186 on: 06/27/2016 08:44 am »
The windows are somewhat oval and are also set at a slight angle to the pressure vessel (i.e: the side away from the hatch protrudes out more than the side towards the hatch.  On the old Dragon info page on the SpaceX site, the dimensions of the lower cylinder (IIRC), were 2.2m wide and .6m long.  If I had to guess (based on these wide-angle photos), I'd say that they made the cone-shaped part of the pressure hull above the cylinder more shallow.  I don't THINK they changed the upper cone, although the angle and lens make it appear somewhat shorter.  One of the photos above shows a man underneath the rig, which may help with scale.
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Offline stoker5432

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1187 on: 06/27/2016 09:22 pm »
I am sure they have not redesigned the shape of the pressure vessel since the pad abort. If I remember correctly it was mentioned though, that the amount of fuel would be increased. But that too was decided before the pad abort.
From what I remember, the pad abort article was was a dragon 1 pressure vessel with a dragon 2 outer mold line, so the differences could entirely be chalked up to that...

Looking at the pictures of the pad abort article verses these new pictures, I can't see how the outer mold line could be the same if that base is used. It looks to be twice as tall. Looking at the hatch position on the pad abort article,to me anyway, clearly indicates use of the older version of the pressure vessel. As far as the bottom of the capsule being shallower, that just looks like camera angle distortion to me.

Offline BrianNH

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1188 on: 08/19/2016 04:50 pm »
New parachute test

https://blogs.nasa.gov/commercialcrew/2016/08/19/spacex-conducts-successful-crew-dragon-parachute-system-test/

Quote
A Crew Dragon test article successfully deployed its four main parachutes as planned during a test that saw the SpaceX-made test article dropped from a C-130 aircraft 26,000 feet above Delamar Dry Lake, Nevada.

Quote
The parachute test is just one of an evaluation regimen that is expected to include many additional parachute drops of increasing complexity. SpaceX and NASA engineers will use the results throughout the test program to confirm the system and get it certified for use first on flight tests and then for operational missions.

Offline Lars-J

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1189 on: 08/19/2016 05:31 pm »

Offline docmordrid

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1190 on: 08/19/2016 05:43 pm »
With a trunk? Looks odd....
DM

Offline whitelancer64

Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1191 on: 08/19/2016 05:45 pm »
4 good chutes. Looks like a very smooth test.
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Offline JBF

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1192 on: 08/19/2016 06:33 pm »
Interesting how much they had to squash it to fit into the cargo plane.
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Offline cscott

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1193 on: 08/19/2016 07:14 pm »
With a trunk? Looks odd....
I think JBF is suggesting that this is the shape of the capsule-without-trunk clipped to the cargo bay volume, not a capsule+trunk.

Offline mme

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1194 on: 08/19/2016 07:31 pm »
With a trunk? Looks odd....
I think it's just the 'chutes mounted in a mass simulator, not a Dragon.
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Offline Craftyatom

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1195 on: 08/19/2016 08:35 pm »
(drop test pictures)

It's gonna take a while to get used to that many chutes, just saying.

And yeah, that looks like just a mass simulator.  Anything with the same mass and a lower Cd should work fine.
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Offline jacqmans

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1196 on: 08/22/2016 02:05 pm »
High Res.
Jacques :-)

Offline Jdeshetler

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1197 on: 08/22/2016 02:50 pm »
This 10 frames per second clip from NASA streaming was altered and stabilized.


Offline deruch

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Re: SpaceX Dragon V2 Updates and Discussion
« Reply #1198 on: 08/26/2016 08:08 am »
This 10 frames per second clip from NASA streaming was altered and stabilized.

For anyone who wants to watch the NASA stream with sound, it can be found in Part 3 of the hosted commentary from John44's capture of the EVA-36 coverage.  The start time mark is 37m:15s.

Expedition-48 - US Spacewalk (EVA-36) (hosted coverage and commentary)
http://www.space-multimedia.nl.eu.org/index.php?option=com_content&view=article&id=9949
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Offline Chris Bergin

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