"Underway" could mean "has been going for some time" and the start wasn't specified but happened earlier. It's possible that whether or not the start has been moved, it may have started before then before anyways.
Quote from: biosehnsucht on 01/13/2017 07:54 pm"Underway" could mean "has been going for some time" and the start wasn't specified but happened earlier. It's possible that whether or not the start has been moved, it may have started before then before anyways.The start has been moved for sure. At previous F9 FT/v1.2 launches, T-38 was the go/no-go poll before prop load.Now it is T-78 minutes. (1h 18min)
Quote from: sdsds on 01/12/2017 11:31 pmQuote from: mme on 01/11/2017 05:31 pmI assume that the Northern/larger hazard area is for the ASDS landing. What is the narrow hazard zone immediately to the south? Fairings? And the hazard area is huge I guess it includes certain failure modes.It might not be fair to characterize all the dispersion as occurring only in failure mode cases. As regards the larger (presumably ASDS) zone, returning stage flight through a box that big might be the result of uncertainties about the boostback burn. Sepculating about the long thin (presumably fairing) zone, it could indicate SpaceX does not believe the fairing descent will be purely ballistic in nature, i.e. aerodynamics might play a part.Fair point. I'm curious how they determine hazard zones.
Quote from: mme on 01/11/2017 05:31 pmI assume that the Northern/larger hazard area is for the ASDS landing. What is the narrow hazard zone immediately to the south? Fairings? And the hazard area is huge I guess it includes certain failure modes.It might not be fair to characterize all the dispersion as occurring only in failure mode cases. As regards the larger (presumably ASDS) zone, returning stage flight through a box that big might be the result of uncertainties about the boostback burn. Sepculating about the long thin (presumably fairing) zone, it could indicate SpaceX does not believe the fairing descent will be purely ballistic in nature, i.e. aerodynamics might play a part.
I assume that the Northern/larger hazard area is for the ASDS landing. What is the narrow hazard zone immediately to the south? Fairings? And the hazard area is huge I guess it includes certain failure modes.
Quote from: mme on 01/13/2017 12:15 amQuote from: sdsds on 01/12/2017 11:31 pmQuote from: mme on 01/11/2017 05:31 pmI assume that the Northern/larger hazard area is for the ASDS landing. What is the narrow hazard zone immediately to the south? Fairings? And the hazard area is huge I guess it includes certain failure modes.It might not be fair to characterize all the dispersion as occurring only in failure mode cases. As regards the larger (presumably ASDS) zone, returning stage flight through a box that big might be the result of uncertainties about the boostback burn. Sepculating about the long thin (presumably fairing) zone, it could indicate SpaceX does not believe the fairing descent will be purely ballistic in nature, i.e. aerodynamics might play a part.Fair point. I'm curious how they determine hazard zones.1e-X risk of a piece of debris Y size hitting an aircraft, and 1e-Q risk of a piece of debris R size hitting a boat. All based upon instantaneous energy available -- velocity, height, fuel on board for kaboom.
Well the fact that a few have blown up might help the modeling
Does anyone know when the webcast is supposed to start? The YouTube technical version of the webcast is showing a counter that's counting down to 9:54:00 local, i.e. less than a minute before liftoff. I'm assuming they'll show us more of the countdown than that.
WEBCAST | Launch webcast will be live about 20 minutes before launch at spacex.com/webcast
Quote from: toruonu on 01/14/2017 02:21 pmWell the fact that a few have blown up might help the modeling How many of the pieces (not mass fraction) were recovered? And would an in-flight explosion of unknown mechanism be similar to a pad explosion?
Quote from: meekGee on 01/14/2017 02:51 pmQuote from: toruonu on 01/14/2017 02:21 pmWell the fact that a few have blown up might help the modeling How many of the pieces (not mass fraction) were recovered? And would an in-flight explosion of unknown mechanism be similar to a pad explosion?I would think they'd just do worst case assumptions, informed by experience.
https://www.flightclub.io/world/?code=IRD1&view=space gives a visualisation of the launch track.Paul
If you want to watch either the Hosted Webcast or the Technical Webcast on YouTube, both of them start at 17:20 UTC (9:20 AM local).In other words, the countdown will be at T-34 minutes at the time the webcasts begin.
Quote from: Paul_G on 01/14/2017 04:04 pmhttps://www.flightclub.io/world/?code=IRD1&view=space gives a visualisation of the launch track.PaulSo it takes off like an airplane then does a 90 degree turn? Interesting.