Quote from: envy887 on 05/01/2017 11:40 amStaged 10 m/s faster than CRS-10, and 4 seconds earlier. Seems very likely to be an upgraded booster.Lighter payload or are you implying Block 4? My bet will be lighter payload ... the Apogee was looking a bit high on the S1, like they were expecting 130-ish km when they were at 160-ish at the peak.
Staged 10 m/s faster than CRS-10, and 4 seconds earlier. Seems very likely to be an upgraded booster.
Quote from: Ben the Space Brit on 05/01/2017 11:41 amWas it me or was the re-entry burn vectored sharply off to one side during the middle phase? I wonder why they would have done that; to give asymmetric braking?It always does that, the elongated plume is visible from the onboard camera in many previous launches. It does look incredible from the outside though. I guess the supersonic airflow does strange things.
Was it me or was the re-entry burn vectored sharply off to one side during the middle phase? I wonder why they would have done that; to give asymmetric braking?
Did you notice that the telemetry altitude is heavily filtered?From 99km down to 0, it displayed the alt with seemingly 0.1km accuracy, but the actual altitude went down in jumps, as if the telemetry feed was first reduced to 1km resolution and later filtered to give a "smooth" appearance during ascent - but whatever interpolation they have for that smoothing seems to be coded for ascent under asceleration and shows weird stairstep -behaviour when being run on descent during deceleration.
Quote from: chalz on 05/01/2017 11:47 amQuote from: Ben the Space Brit on 05/01/2017 11:41 amWas it me or was the re-entry burn vectored sharply off to one side during the middle phase? I wonder why they would have done that; to give asymmetric braking?It always does that, the elongated plume is visible from the onboard camera in many previous launches. It does look incredible from the outside though. I guess the supersonic airflow does strange things.Does the IIP remain offshore through both entry and landing burn or just landing? It may be adjusting the track at that point.
Looks like aerodynamic braking is pretty strong, as expected. After the entry burn, it accelerated for a while in the thin air, then decelerated at about 2G. Terminal velocity looked like about 300 m/s. This is about as expected from something of that size, shape, and mass.
Interesting periodic "breathing" from the main engines was noticed by reddit user Brusion. From around T+4.30 to reentry burn.
A few observations from this wonderful footage:There is a "heartbeat" like glow (not the nitrogen thrusters) at the base of the rocket every few seconds. My guess is that they are releasing pressure through the engines so (as opposed to the vents) so they don't upset the attitude.The jets are navigating in 3d,not just two. You can see them thrusting fore and aft as well as sideways.
Terminal velocity looked like about 300 m/s. This is about as expected from something of that size, shape, and mass.
Quote from: saliva_sweet on 05/01/2017 12:53 pmInteresting periodic "breathing" from the main engines was noticed by reddit user Brusion. From around T+4.30 to reentry burn.I think this periodic venting is something the head of mission assurance(Koenigsmann) said was going to be done to fix bubbles in lines that were preventing even starting of engines for landing burn. All he said was that there was a problem of heating on the intake lines to the engines. So to fix it they can insulate better and didn't say what the other was.
There is a "heartbeat" like glow (not the nitrogen thrusters) at the base of the rocket every few seconds. My guess is that they are releasing pressure through the engines so (as opposed to the vents) so they don't upset the attitude.
Quote from: LouScheffer on 05/01/2017 11:50 am Terminal velocity looked like about 300 m/s. This is about as expected from something of that size, shape, and mass.Interesting. That terminal velocity is 2x the 150 m/sec terminal velocity observed on the first F9 landing at the Cape. F9 has bulked up since then...http://forum.nasaspaceflight.com/index.php?topic=39100.msg1465116#msg1465116
Quote from: saliva_sweet on 05/01/2017 12:53 pmInteresting periodic "breathing" from the main engines was noticed by reddit user Brusion. From around T+4.30 to reentry burn.Engine(s) need to be chilled down prior to ignition to get them to the engine start box so it might also be that.
Quote from: Phil Stooke on 05/01/2017 01:05 pm"...the execution of 100s of people at SpaceX "I had heard that this approach was used in North Korea to encourage hard work among the survivors, but I didn't expect it to be used in the USA as well. Still, these days, who knows?Haha, I lol'ed... :-)Amazing footage indeed. Would have loved a closer ground-to-booster view on landing but that's my only quibble.Congrats to the NRO on being able to snoop even more on all of us
"...the execution of 100s of people at SpaceX "I had heard that this approach was used in North Korea to encourage hard work among the survivors, but I didn't expect it to be used in the USA as well. Still, these days, who knows?