Looks like it only lit for a second or so to me... ~1:50 mark in the video
From this cool angle viewing with black line inserted as a centerline, the 1st stage seems to have shifted as much as 1.5 meter to the right at the last 2 meter without any issues!
Quote from: terryy on 01/16/2016 05:33 amQuote from: somepitch on 01/16/2016 03:38 amLooks like it only lit for a second or so to me... ~1:50 mark in the videoIt sounded like a pretty long fire to me. It takes a few second for the sound of the rocket motor firing to reach the camera's location. But at around the 2:00 mark you can start to hear the distinct rumble of the engine firing and it pretty much lasts all the way till the end of the video.And you can see the plume of smoke billowing up on the far right side of the video out of the flame duct. It clearly lit for an extended period of time.
Quote from: somepitch on 01/16/2016 03:38 amLooks like it only lit for a second or so to me... ~1:50 mark in the videoIt sounded like a pretty long fire to me. It takes a few second for the sound of the rocket motor firing to reach the camera's location. But at around the 2:00 mark you can start to hear the distinct rumble of the engine firing and it pretty much lasts all the way till the end of the video.
Could someone please interpret 'debris ingestion' for the layman. It sounds like something that could have happened during ascent. It's concerning that he jumped to that explanation. One would expect the rocket is designed to be free of debris-generating parts, fuel fully filtered, etc. Then again Merlin was actually qualification tested with a loose nut in the feed line, or so it was said.
Could someone please interpret 'debris ingestion' for the layman.
Quote from: enzo on 01/16/2016 02:20 amCould someone please interpret 'debris ingestion' for the layman. It sounds like something that could have happened during ascent. It's concerning that he jumped to that explanation. One would expect the rocket is designed to be free of debris-generating parts, fuel fully filtered, etc. Then again Merlin was actually qualification tested with a loose nut in the feed line, or so it was said."Debris" can mean "anything that's not propellant", really. My suspicion is that it's some soot that got blown back up into the tank or engine piping somehow, possibly from airflow during EDL, from having a valve that got stuck open or something similar. Not really macroscopic chunks of debris, but more like impurities that mess with the combustion. Given nothing seems to have blown up, we're not talking about an N-1 style "ate a bolt and died horribly" sort of scenario.
I hate it when they're all secretive like that.
I think the term "thrust fluctuations" is interesting word choice. There's lots of terms to describe non-nominal engine burn from a thrust point of view -- loss of thrust- reduced thrust- thrust fluctuations- thrust excursion...all of which have slightly different semantics.
My suspicion is that it's some soot that got blown back up into the tank or engine piping somehow, possibly from airflow during EDL, from having a valve that got stuck open or something similar. Not really macroscopic chunks of debris, but more like impurities that mess with the combustion. Given nothing seems to have blown up, we're not talking about an N-1 style "ate a bolt and died horribly" sort of scenario.
Quote from: NovaSilisko on 01/16/2016 08:24 amMy suspicion is that it's some soot that got blown back up into the tank or engine piping somehow, possibly from airflow during EDL, from having a valve that got stuck open or something similar. Not really macroscopic chunks of debris, but more like impurities that mess with the combustion. Given nothing seems to have blown up, we're not talking about an N-1 style "ate a bolt and died horribly" sort of scenario.Not really. Anything with carbon in it would have ignited when exposed to LOX.
Wouldnt the thrust fluctuations have caused an abort anyway? Maybe thats why its so short?