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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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ping Gunner, even the 'big boys' sometimes have a little weld failure.
Okay, Copenhagen Suborbitals had an engine test, which generated some
rather spectacular video https://www.youtube.com/watch?v=f-4n-2MtECE First you see the test (all 17 seconds) in real time, then repeated at 240 fps. Apparently those GoPro Heros really hold up .... Then comes the post mortem: http://copsub.com/autopsy-of-heat-2x-and-tm65le/ Seems there were a few welds on the nozzle cooling jacket which did not get full penetration. to quote «Summary The results of the autopsy are consistent with a scenario in which the engine compartment had a leak of fuel already in the pre-stage due to a damaged packaging under the fuel pre-stage valve. As the pressure increased nominally at the start of the main-stage, the undersized spacers between the inner and outer walls of the cooling jacket as well as the poor and undersized welds caused the cooling jacket to burst open. Fuel ran out into the open air without passing through the combustion chamber, while the LOX/GOX unreacted ran out through the nozzle. Both contributed to the outer fire, which in turn ignited the fuel which escaped through the hatches from the engine compartment. Blow back through hatches created a secondary fire in the engine compartment. We could not detect a leak in the LOX system.» Interesting, to me, is the robustness of the electronic components - at least the flash memory chip is expected to provide usable data, once disconnected from the burnt board mounted on a working board. okay, play safe out there. -- pyotr filipivich. Discussing the decline in the US's tech edge, James Niccol once wrote "It used to be that the USA was pretty good at producing stuff teenaged boys could lose a finger or two playing with." |
#2
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ping Gunner, even the 'big boys' sometimes have a little weld failure.
On Mon, 01 Sep 2014 22:44:24 -0700, pyotr filipivich
wrote: Okay, Copenhagen Suborbitals had an engine test, which generated some rather spectacular video https://www.youtube.com/watch?v=f-4n-2MtECE First you see the test (all 17 seconds) in real time, then repeated at 240 fps. Apparently those GoPro Heros really hold up .... Y'think GoPro will warranty that 'un? Then comes the post mortem: http://copsub.com/autopsy-of-heat-2x-and-tm65le/ Seems there were a few welds on the nozzle cooling jacket which did not get full penetration. I wonder if one of the engineers produced that one. Otherwise, they need to use a certified weldor from now on. If they did, the guy needs to practice a LOT and be recertified post haste. Interesting, to me, is the robustness of the electronic components - at least the flash memory chip is expected to provide usable data, once disconnected from the burnt board mounted on a working board. Methinks they're probably too optimistic. -- Let no man imagine that he has no influence. Whoever he may be, and wherever he may be placed, the man who thinks becomes a light and a power. -- Henry George |
#3
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ping Gunner, even the 'big boys' sometimes have a little weld failure.
Larry Jaques on Wed, 03 Sep 2014
05:44:32 -0700 typed in rec.crafts.metalworking the following: On Mon, 01 Sep 2014 22:44:24 -0700, pyotr filipivich wrote: Okay, Copenhagen Suborbitals had an engine test, which generated some rather spectacular video https://www.youtube.com/watch?v=f-4n-2MtECE First you see the test (all 17 seconds) in real time, then repeated at 240 fps. Apparently those GoPro Heros really hold up .... Y'think GoPro will warranty that 'un? Then comes the post mortem: http://copsub.com/autopsy-of-heat-2x-and-tm65le/ Seems there were a few welds on the nozzle cooling jacket which did not get full penetration. I wonder if one of the engineers produced that one. Otherwise, they need to use a certified weldor from now on. If they did, the guy needs to practice a LOT and be recertified post haste. Interesting, to me, is the robustness of the electronic components - at least the flash memory chip is expected to provide usable data, once disconnected from the burnt board mounted on a working board. Methinks they're probably too optimistic. They won't know till they try, eh no? -- pyotr filipivich "With Age comes Wisdom. Although more often, Age travels alone." |
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