Could the extra performance required from the second stage to reach orbit after first stage problem have depleted the second stage in such a way that it wasn't able to perform the Orbcomm part of the mission ?
Quote from: pericynthion on 10/08/2012 08:18 amQuote from: hektor on 10/08/2012 07:16 amCould the extra performance required from the second stage to reach orbit after first stage problem have depleted the second stage in such a way that it wasn't able to perform the Orbcomm part of the mission ?Gravity loss from one engine out in first stage for 90 seconds is probably < 50 m/s, ...hopefully a little less, given the explosion and debris shedding
Quote from: hektor on 10/08/2012 07:16 amCould the extra performance required from the second stage to reach orbit after first stage problem have depleted the second stage in such a way that it wasn't able to perform the Orbcomm part of the mission ?Gravity loss from one engine out in first stage for 90 seconds is probably < 50 m/s, ...
Quote from: Tcommon on 10/08/2012 01:17 pmQuote from: pericynthion on 10/08/2012 08:18 amQuote from: hektor on 10/08/2012 07:16 amCould the extra performance required from the second stage to reach orbit after first stage problem have depleted the second stage in such a way that it wasn't able to perform the Orbcomm part of the mission ?Gravity loss from one engine out in first stage for 90 seconds is probably < 50 m/s, ...hopefully a little less, given the explosion and debris shedding NOTE: this is an updates thread. "explosion" and "debris" is speculation. The official facts made known are that an engine anomaly occurred and the engine was shut down early. Nothing else at this point.
Quote from: Chandonn on 10/08/2012 01:23 pmQuote from: Tcommon on 10/08/2012 01:17 pmQuote from: pericynthion on 10/08/2012 08:18 amQuote from: hektor on 10/08/2012 07:16 amCould the extra performance required from the second stage to reach orbit after first stage problem have depleted the second stage in such a way that it wasn't able to perform the Orbcomm part of the mission ?Gravity loss from one engine out in first stage for 90 seconds is probably < 50 m/s, ...hopefully a little less, given the explosion and debris shedding NOTE: this is an updates thread. "explosion" and "debris" is speculation. The official facts made known are that an engine anomaly occurred and the engine was shut down early. Nothing else at this point.no, there was an explosion and debris shedding. the video is clear. no doubt about it.
Quote from: hektor on 10/08/2012 07:16 amCould the extra performance required from the second stage to reach orbit after first stage problem have depleted the second stage in such a way that it wasn't able to perform the Orbcomm part of the mission ?That apperas to be the case. Not enough prop to go to the orbcomm release orbit so realeased lower. Dragon will have to do a larger out of plane burn but within limits.
I can't find a time for the next press conference (I read something like Monday evening). Is the time already set?
Haven't they said in post-launch conference that Orbcomm satellite was released to planned orbit?
Quote from: hektor on 10/08/2012 07:16 amCould the extra performance required from the second stage to reach orbit after first stage problem have depleted the second stage in such a way that it wasn't able to perform the Orbcomm part of the mission ?Gravity loss from one engine out in first stage for 90 seconds is probably < 50 m/s, whereas the injection burn for Orbcomm was supposed to be around 100 m/s and you'd think they'd have SOME performance margin, paricularly with such a lightly-loaded Dragon.
No word on GNC bay door ? Any Spacex folks online?
The silence surrounding the GNC door is starting to worry me. It should have opened by now, and it's not like SpaceX to ignore facts surrounding successful milestones.