SpaceX And/Or Rocketry In General

Anonymous

JumpinJohnny wrote:assume

JumpinJohnny wrote:
assume that is the Atlas 5-b?

 Yes it was.  

Quote:
nice pic btw

thanks (to all)

 

Mike Hewson
Mike Hewson
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AgentB wrote:Mike Hewson

AgentB wrote:
Mike Hewson wrote:
AgentB wrote:
I'm not convinced yet there was ignition before COPV failure

 I'm thinking quite microscopically here. I appreciate their problem of having to generate an explanation that only spans a quite short time interval. 

I found the rather interesting original NASA article about COPVs and a failure will cause catastrophic damage https://ston.jsc.nasa.gov/collections/trs/_techrep/SP-2011-573.pdf

I will read the entire article. Thanks very much for that.

Cheers, Mike.

I have made this letter longer than usual because I lack the time to make it shorter ...

... and my other CPU is a Ryzen 5950X :-) Blaise Pascal

Mike Hewson
Mike Hewson
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SpaceFlight Now has a Falcon

SpaceFlight Now has a Falcon nine for sometime this month from Vandenberg, Iridium satellites. These will be polar orientation @ LEO. Here's hoping! :-)

Cheers, Mike.

I have made this letter longer than usual because I lack the time to make it shorter ...

... and my other CPU is a Ryzen 5950X :-) Blaise Pascal

Anonymous

Russian resupply ship for

Russian resupply ship for space station lost.  Cause not determined/published at this time.   Japan will be launching next supply mission next week I believe.  

Mike Hewson
Mike Hewson
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An Iridium twitter has Dec 16

An Iridium twitter has Dec 16 for the Falcon 9 @ Vandenberg.

So I guess in the end was the enthalpy component of the Gibbs here ie. the energy to drive the reaction is the pressure differential either side of the COPV shell initially at least with constant volume. The solid oxygen caused the shell rupture .... just goes to show that Gibbs certainly applies in low temperature/entropy scenarios. Actually Einstein ranked Gibbs second to Lorentz when he was asked in later life who were the smartest physicists during his career.

FWIW : It seems that SpaceX's launch customers have been privy to the full data/analysis on the COPV issue. This involvement was from the get-go of the investigation. I think such transparency is both quite brave and clever business. You don't see that sort of approach very often. To my knowledge there have been no withdrawals from the manifest. If that is true then I think simple honesty has been a major reason in maintaining customer confidence. Such I think contributes to the 'market disruptor' legend that is building around Elon and his enterprises. In a traditional commercial sense he is behaving rather anti-intuitively and many can't cope with that.

{ An important advantage he has is not having a gaggle of public/random investors to satisfy with SpaceX. So I don't feel so bad now about not having access to shareholdings. If it works better this way then more power to him. }

Cheers, Mike

I have made this letter longer than usual because I lack the time to make it shorter ...

... and my other CPU is a Ryzen 5950X :-) Blaise Pascal

archae86
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Mike Hewson wrote:An Iridium

Mike Hewson wrote:
An Iridium twitter has Dec 16 for the Falcon 9 @ Vandenberg.

A bit more detail from the Iridium press release of December 1 as posted at NasaSpaceFlight.com

Quote:
Iridium Announces Date for First Iridium NEXT Launch
SpaceX Set for First Launch of Iridium's Next-Generation Global Satellite Constellation
MCLEAN, Va., Dec. 01, 2016 (GLOBE NEWSWIRE) -- Iridium Communications Inc. (NASDAQ:IRDM) announced today the date for the first launch of its next-generation global satellite constellation, Iridium NEXT.  Iridium will be launching on SpaceX's Falcon 9 rocket on December 16, 2016 at 12:36 p.m. PST. Launching from Vandenberg Air Force Base in California, the Falcon 9 rocket will deliver 10 Iridium NEXT satellites into low-earth orbit.
Mike Hewson
Mike Hewson
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Ah, these Iridium satellites

Ah, these Iridium satellites are made of LEGO :

iridium.jpg

Cheers, Mike.

I have made this letter longer than usual because I lack the time to make it shorter ...

... and my other CPU is a Ryzen 5950X :-) Blaise Pascal

Chris S
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I read that as Indian. Same

I read that as Indian. Same difference I suppose ....

Waiting for Godot & salvation :-)

Why do doctors have to practice?
You'd think they'd have got it right by now

archae86
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While SpaceFlight Now still

While SpaceFlight Now still shows a Falcon 9 Vandenburg launch of Iridium satellites on December 16, 2016, other sources I trust say the soonest possible has been pushed out into January 2017.

From SpaceX itself this comment "We are finalizing the investigation into our September 1 anomaly and are working to complete the final steps necessary to safely and reliably return to flight, now in early January with the launch of Iridium-1. This allows for additional time to close-out vehicle preparations and complete extended testing to help ensure the highest possible level of mission assurance prior to launch."

Mike Hewson
Mike Hewson
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Fair call. Sounds like they

Fair call. Sounds like they have a good grasp of the failure mode and want to be sure of the workaround.

Cheers, Mike.

I have made this letter longer than usual because I lack the time to make it shorter ...

... and my other CPU is a Ryzen 5950X :-) Blaise Pascal

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