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Space transport

 
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PS_RalphW



Joined: 24 Nov 2005
Posts: 5265
Location: Cambridge

PostPosted: Mon Jun 29, 2015 11:24 am    Post subject: Space transport Reply with quote

Another resupply rocket to the international space station explodes.

http://www.bbc.co.uk/news/science-environment-33305083

That's the second delivery failure in a row

http://www.theguardian.com/science/2015/may/07/russias-progress-spacecraft-set-to-crash-to-earth-within-24-hours

How many more before the ISS has to be left unmanned?
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3rdRock
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PostPosted: Mon Jun 29, 2015 11:35 am    Post subject: Reply with quote

Delivery failure? They should have used Ocado! Laughing
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fuzzy



Joined: 29 Nov 2013
Posts: 593
Location: The Marches, UK

PostPosted: Mon Jun 29, 2015 6:08 pm    Post subject: Reply with quote

Lots of technical failures in the 21st C in systems that should have improved since Apollo, not regressed. Planes, trains, rockets etc. How many of these are sabotage/cyberwar?
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PS_RalphW



Joined: 24 Nov 2005
Posts: 5265
Location: Cambridge

PostPosted: Mon Jun 29, 2015 8:01 pm    Post subject: Reply with quote

It is not cyberwar. It is simply diminishing returns on complexity of systems.

Modern hardware like space rockets or cars have so many parts made of so many different materials and engineered to such high tolerances to minimise weight and cost, that the overall construction is being less reliable even as the individual components become orders of magnitude more reliable.

The Kalashnikov machine gun is one of the most successful designs of all time because it is so simple and fault tolerant.

The recent crash of an A400M transport , killing all 8 people on board, was because of a software initialisation error, where engine calibration files for 3 of the 4 engines were accidentally deleted from the on board computers. The error was not apparent untill high thrust was demanded from the engines and they went into automatic 'safe mode' when the control program couldn't find the files, cutting power to protect the engines from possible damage, and ensuring their complete destruction instead.

I had a similar (less harmful) incident with my car, where the automatic brake system cut in, and nearly propelling my daughter (I hadn't checked her seat belt) through the windscreen when I braked briefly to miss an incompetent cyclist. Daughter hit the screen hand first and created a 20cm star fracture in the glass.
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Little John



Joined: 08 Mar 2008
Posts: 5666
Location: UK

PostPosted: Mon Jun 29, 2015 8:05 pm    Post subject: Reply with quote

PS_RalphW wrote:
It is not cyberwar. It is simply diminishing returns on complexity of systems.

Modern hardware like space rockets or cars have so many parts made of so many different materials and engineered to such high tolerances to minimise weight and cost, that the overall construction is being less reliable even as the individual components become orders of magnitude more reliable....
Now doesn't that sound like the perfect description of the problem with modern industrial society.
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emordnilap



Joined: 05 Sep 2007
Posts: 13972
Location: Houǝsʇlʎ' ᴉʇ,s ɹǝɐllʎ uoʇ ʍoɹʇɥ ʇɥǝ ǝɟɟoɹʇ' pou,ʇ ǝʌǝu qoʇɥǝɹ˙

PostPosted: Tue Jun 30, 2015 11:08 am    Post subject: Reply with quote

The old equation: resilience is in inverse proportion to efficiency.
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AutomaticEarth



Joined: 08 Nov 2010
Posts: 818

PostPosted: Sat Apr 09, 2016 9:09 am    Post subject: Reply with quote

Pretty cool:

http://www.businessinsider.com/spacex-just-launched-rocket-2016-4
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clv101
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Joined: 24 Nov 2005
Posts: 7633

PostPosted: Sat Apr 09, 2016 5:56 pm    Post subject: Reply with quote

Technically it's pretty amazing. I was watching the live video feed and the excitement at the space centre was amazing. Also worth looking back at videos of the previous crash landings.

So this kind of technology is likely to significantly reduce the cost of launching things into space... I'm not wholly convinced that's actually a good thing though!
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