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Future Robotic Shuttles?
On Oct 22, 8:55*am, Jeff Findley wrote:
In article 96dd767b-f54d-41e2-ba37-2a55cd6d8d89 @j18g2000yqd.googlegroups.com, says... well the shuttle is worse than flying in combat and most military airplanes have ejection seats. Worse than flying in combat? *No Bob, that's NOT true. *Shuttle has only had two failures in 132 flights, which is a 1 in 66 loss of crew rate. * That's a heck of a lot better than what our boys were facing during WW- II. * My grandfather was an engineer on a B-24 during WW-II and the life expectancy of one of an air crew was extremely dismal and they had no ejection seats (they did have parachutes though). *I know you can't always trust the Internet for facts like this, but here it is anyway: * * Bomber crews' tour of duty was 25 missions (later raised to 35) * * But, the life expectancy of the average crew was just 14 missions.. Most NASA astronauts only fly one or five missions. *There is a *very* small minority who have flown six or more missions. *No NASA astronaut has flown anywhere near the 25 or 35 missions required to complete a WW- II bomber crew's tour. * Obviously, the actual risk to a single shuttle astronaut is *far* lower than that of a WW-II bomber crew, who flew together on every one of those missions until one of two things stopped them: *1. They were shot down (most likely all killed) or 2. They completed their tour of duty and went home. * If you're going to make wild assertions that may offend combat veterans and their families, please back up that assertion with facts and verifiable statistical analyses. theres no escape system on commercial airliners since most accidents occur during takeoff or landing, and theres no way to get out during those times Most launch vehicle accidents occur during launch or reentry/landing too. *You take your chances during launch and landing, and every astronaut knows those odds and chooses to fly anyway. *Just because some whiners like you don't like the odds is no reason to stop flying. Jeff -- 42 jeff the less safe than combat was widely accepted and discussed right after columbia loss. i suppose it should of said current combat aircraft are safer than flying in a shuttle I feel bad for the workers that the shuttle is ending without a replacement. Although this was clearly a nasa management failure if they would of choosen to fly on deltas we would be flying today |
#62
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Future Robotic Shuttles?
"greenaum" wrote in message ... On Sat, 18 Sep 2010 01:36:04 -0400, JF Mezei sprachen: Perhaps NASA might be able to develop a cost effective way to manufacture large carbon-carbon parts and make a shuttle belly out of a dozen carbon-carbon panels instead of thousands of tiles. I realise this is nearly a year old, but Usenet's not what it used to be... The latest New Scientist is a bit of a special on 3D printing / "additive manufacturing". At the moment, it's based round spreading a layer of powder, and using lasers / electron beams to melt the powder together, sintering it into solid parts. You do one layer, then spread some more powder for the second layer. After a while, you end up with a big pile of powder with a 3D object hidden in it. ----------------------------------------------------------- There was an article in a magazine (Wired?) about eight years or so ago. It mentioned the possibility of using 3D printers to build laptop computers. It said the first one might cost $1 billion, but after that it would drop to $15. Has their been any progress in this recently? Are we close to being able to print modern computers with 3D printers? Rep Rap looks neat, but the printers are limited to making simple plastic toys, nothing even remotely close to a laptop computer. |
#63
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Future Robotic Shuttles?
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