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Strut snap stops SpaceX strutting
http://www.engadget.com/2015/07/20/s...=rss_truncated
During a call today about the Flacon 9 rocket mishap in June, Musk announced that a strut holding a high pressure helium bottle failed during the second stage of the launch. ... Going forward, SpaceX will stress test individual struts. The strut that failed was about two feet long and one inch thick at its thickest point. The struts are supposed to handle 10,000 pounds of force, the strut that failed broke after only 2,000 pounds of force. Has there been a failure that simple/basic/fundamental (better term?) since the aluminum nut of Falcon 1? Reading between the lines, it would seem that not all struts were being tested. An added test here, an added test there I suppose. rick jones -- the road to hell is paved with business decisions... these opinions are mine, all mine; HP might not want them anyway... feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH... |
#3
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Strut snap stops SpaceX strutting
-- "the perennial claim that hypersonic airbreathing propulsion would magically make space launch cheaper is nonsense -- LOX is much cheaper than advanced airbreathing engines, and so are the tanks to put it in and the extra thrust to carry it." - Henry Spencer nasas approach, nothing will fly till the weight of the paperwork equals the weight of the vehicle |
#4
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Strut snap stops SpaceX strutting
In article ,
Jeff Findley wrote: From a design point of view, there was a sufficient factor of safety. Unfortunately, the part didn't meet the specification. SpaceX was relying on the supplier to do any testing. From this point on, SpaceX will do its own testing. This is clearly prudent since we've now proven that the failure of a strut can cause loss of vehicle. But, that is hindsight. Do they force the supplier to lower the price a bit, as clearly they weren't doing everything that price covered? -- Chris Mack "If we show any weakness, the monsters will get cocky!" 'Invid Fan' - 'Yokai Monsters Along With Ghosts' |
#5
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Strut snap stops SpaceX strutting
In article ,
says... In article , Jeff Findley wrote: From a design point of view, there was a sufficient factor of safety. Unfortunately, the part didn't meet the specification. SpaceX was relying on the supplier to do any testing. From this point on, SpaceX will do its own testing. This is clearly prudent since we've now proven that the failure of a strut can cause loss of vehicle. But, that is hindsight. Do they force the supplier to lower the price a bit, as clearly they weren't doing everything that price covered? News reports say they will "most likely" switch suppliers and make the struts out of another material. Inconel is reportedly the material of choice he https://en.wikipedia.org/wiki/Inconel From above: Inconel 718 is commonly used for cryogenic storage tanks... Inconel is more expensive, but reportedly less likely to suffer from embrittlement caused by submersion in cryogenic LOX than the previously used steel material. Note, I'm not a material scientist, so I'm just reporting what I've read recently. Jeff -- "the perennial claim that hypersonic airbreathing propulsion would magically make space launch cheaper is nonsense -- LOX is much cheaper than advanced airbreathing engines, and so are the tanks to put it in and the extra thrust to carry it." - Henry Spencer |
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