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The first stage engines that exploded were AJ-26 engines. These are remanufactured NK-33 or NK-43 engines built in the Soviet Union in the late-60s or early-70s for the N-1 moon rocket, but never used. In May, an AJ-26 exploded on the test stand at Stennis space center in Mississippi, severely damaging the test stand.
There aren't many blogs covering this right now, but there are no personnel injured (according to the launch loop) -- just "significant property damage and significant vehicle damage". Nobody has said much yet: https://twitter.com/OrbitalSciences/status/52722568241456742...
>> "significant property damage and significant vehicle damage" This wasn't launched in a desert/uninhabited area? Edit: Thanks for clarifying below.
More discussion on spacex reddit: http://www.reddit.com/r/spacex/comments/2km5vq/ot_orbitals_a...
Reddit thread is interesting. Pulled this off there... wow https://www.youtube.com/watch?v=Zl12dXYcUTo
My entire physics lab watched this happen live. It started going up and everyone was cheering. Seconds later just caught fire, and fell to the ground and exploded. "That's what happens when you set 'a' to negative." a good lesson from my TA
Video of the explosion: https://www.youtube.com/watch?v=jHMmMgdcOSU ...and I believe this is the water-tower you can see in the video: https://www.google.se/maps/place/NASA+Wallops+Flight+Facilit...
I had a close friend who worked on this. Everybody in our lab stopped working this afternoon to watch it launch, and to cheer our friend on. Definitely went from "YAY!" to sad really quick. It's been said other places in this thread, but to echo it again: I really feel for all the engineers involved in this. That's got to be devastating. To everybody: failures suck, but big spectacular failure is directly correlated…