Author Topic: SpaceX Falcon 9 : Hispasat 30W-6 (1F) : March 6, 2018 - DISCUSSION (Read 164930 times)

the_other_Doug · « **Reply #280 on:** 03/06/2018 04:47 am »

From the update thread:

Quote from: Craig_VG on 03/06/2018 04:40 am

Elon's jet continues to circle over the landing area

I bet it's capturing performance data on the landing burn. After all, with no ASDS and no support ships downrange, the landing area is below the horizon from any assets SpaceX has to track it and recover data from it.

Rumors that Elon is planning on jumping onto the stage as it passes, wrenching off the Ti grid fins, and hauling them back into his plane are purely speculative, in my view...

speedevil · « **Reply #281 on:** 03/06/2018 04:50 am »

Quote from: the_other_Doug on 03/06/2018 04:47 am

Rumors that Elon is planning on jumping onto the stage as it passes, wrenching off the Ti grid fins, and hauling them back into his plane are purely speculative, in my view...

Yeah - the fins were just there to provide something for the hook to grab onto so they can recover the stage in mid air.
_{(the plane is not nearly large enough, for the avoidance of doubt, neglecting other issues)}

hopalong · « **Reply #282 on:** 03/06/2018 04:52 am »

Looks like Elons G650 is heading home.

LouScheffer · « **Reply #283 on:** 03/06/2018 04:52 am »

Parking orbit is low, just 165 km. From this orbit, need to increase speed to 10276 m/s for GEO apogee. But since Earth spin provided 402 m/s, we need 9874 m/s, or 35550 km/hr by SpaceX speedometer. If it gets this it's GTO or greater.

cferreir · « **Reply #284 on:** 03/06/2018 04:55 am »

Somethings SpaceX does baffle me. Why not broadcast the video of stage 1 deorbiting and landing on the water? Even if it fails to light and smashes it is still a win and still impressive. Why not show it? We still haven't seen the video of the stage that bounced around on landing (I forget the mission). Again all of these are WINs why not show the video?

Just a fan.

tvg98 · « **Reply #285 on:** 03/06/2018 04:57 am »

Quote from: cferreir on 03/06/2018 04:55 am

Somethings SpaceX does baffle me. Why not broadcast the video of stage 1 deorbiting and landing on the water? Even if it fails to light and smashes it is still a win and still impressive. Why not show it? We still haven't seen the video of the stage that bounced around on landing (I forget the mission). Again all of these are WINs why not show the video?

Just a fan.

Not a whole to see in the middle of the night I'm afraid. As for the others, I guess not everybody sees it the way we do.

catdlr · « **Reply #286 on:** 03/06/2018 04:58 am »

Quote from: cferreir on 03/06/2018 04:55 am

Somethings SpaceX does baffle me. Why not broadcast the video of stage 1 deorbiting and landing on the water? Even if it fails to light and smashes it is still a win and still impressive. Why not show it? We still haven't seen the video of the stage that bounced around on landing (I forget the mission). Again all of these are WINs why not show the video?

Just a fan.

see at 1:20 in this video

tvg98 · « **Reply #287 on:** 03/06/2018 05:01 am »

Looks like they forgot to show the telemetry. $:-\$

Comga · « **Reply #288 on:** 03/06/2018 05:09 am »

Quote from: CyndyC on 03/06/2018 04:39 am

This is the first launch I've thought of looking for from my house near downtown Jacksonville Florida, and I saw it easily, about 10-15 seconds before MECO.

Also clearly visible from ~170 km to the south
Was able to see several minutes of second stage flight
Did not see any first stage reentry burn

WBY1984 · « **Reply #289 on:** 03/06/2018 05:09 am »

What was with the spinninng of stage 2 at the end? It imparted a noticeable spin on the satellite - and not in the usual spin stabilisation axis ( not that this satellite is spun stabilised to begin with.)

ugordan · « **Reply #290 on:** 03/06/2018 05:17 am »

Quote from: WBY1984 on 03/06/2018 05:09 am

What was with the spinninng of stage 2 at the end? It imparted a noticeable spin on the satellite - and not in the usual spin stabilisation axis ( not that this satellite is spun stabilised to begin with.)

The stage was obviously maneuvering after separation and since it only has one set of thrusters in the engine section, even pitch/yaw rotational corrections will impart some translational movement.

cscott · « **Reply #291 on:** 03/06/2018 05:19 am »

Quote from: tvg98 on 03/06/2018 04:57 am

Quote from: cferreir on 03/06/2018 04:55 am
Somethings SpaceX does baffle me. Why not broadcast the video of stage 1 deorbiting and landing on the water? Even if it fails to light and smashes it is still a win and still impressive. Why not show it? We still haven't seen the video of the stage that bounced around on landing (I forget the mission). Again all of these are WINs why not show the video?

Just a fan.

Not a whole to see in the middle of the night I'm afraid. As for the others, I guess not everybody sees it the way we do.

Also, they didn't have real-time telemetry of the landing this time, since they didn't have their relay ship out in the "stormy Atlantic". They had Elon's plane, but it probably was just recording the downlink, not relaying it in real-time.

You might see some footage from Elon's plane appear, if it is interesting. But probably there's not much to see in the dark at a safe distance.

WBY1984 · « **Reply #292 on:** 03/06/2018 05:21 am »

The stage was obviously maneuvering after separation and since it only has one set of thrusters in the engine section, even pitch/yaw rotational corrections will impart some translational movement.
[/quote]

I'm fairly sure I saw S2 pitching before deployment - you could see it in the shots where the Earth is in the background.

robert_d · « **Reply #293 on:** 03/06/2018 05:30 am »

Quote from: WBY1984 on 03/06/2018 05:21 am

I'm fairly sure I saw S2 pitching before deployment - you could see it in the shots where the Earth is in the background.

This did not appear normal. But the rate seemed pretty low, so hopefully the spacecraft can recognize it and correct it.

tvg98 · « **Reply #294 on:** 03/06/2018 05:54 am »

I was just listening to the launch again, but this time I was listening to the technical audio only. Considering that we never heard the landing burn call out and since a few people were like "aww

" right after the re-entry burn shut down call out, I'm guessing they lost the signal and B1044 may not have survived re-entry. Or, they lost the signal but since they did not have a boat in the area to relay telemetry, they had to confirm visually whether or not the first stage managed a soft splashdown. That's probably what Elon's private jet was for.

(Sorry if this was obvious to some of you).

wannamoonbase · « **Reply #295 on:** 03/06/2018 05:55 am »

Congrats SpaceX on another successful launch.

Every smooth launch is so important. This one is a big bird and maybe one of the last expendable boosters they fly.

Looking forward to the next couple of months of launches.

CJ · « **Reply #296 on:** 03/06/2018 05:56 am »

I replayed the launch vid. There's definitely a rate going on just prior to payload sep (as mentioned above, you can see the earth moving behind the nozzle) and during sep the sun is translating from left to right.

I have no idea if this is an anomaly, but it's something I have not seen before.

su27k · « **Reply #297 on:** 03/06/2018 06:17 am »

Pretty sure the rotation is intentional, if you check past SSL 1300 separation video, you can see similar maneuver by the 2nd stage prior to release, so I think this is probably a requirement by the satellite.

JCSAT-16: https://youtube.com/watch?v=OERDIFnFvHs&t=2883

Echostar XXIII: https://youtube.com/watch?v=dM2Dp1Adlag&t=2739

Jim's (rather short) explanation: https://forum.nasaspaceflight.com/index.php?topic=40374.msg1654851#msg1654851

WBY1984 · « **Reply #298 on:** 03/06/2018 06:21 am »

Quote from: su27k on 03/06/2018 06:17 am

Pretty sure the rotation is intentional, if you check past SSL 1300 separation video, you can see similar maneuver by the 2nd stage prior to release, so I think this is probably a requirement by the satellite.

JCSAT-16: https://www.youtube.com/watch?v=OERDIFnFvHs?t=2883

Echostar XXIII: https://www.youtube.com/watch?v=dM2Dp1Adlag?t=2739

Great catch!

Joffan · « **Reply #299 on:** 03/06/2018 06:21 am »

Quote from: tvg98 on 03/06/2018 05:54 am

I was just listening to the launch again, but this time I was listening to the technical audio only. Considering that we never heard the landing burn call out and since a few people were like "aww " right after the re-entry burn shut down call out, I'm guessing they lost the signal and B1044 may not have survived re-entry. Or, they lost the signal but since they did not have a boat in the area to relay telemetry, they had to confirm visually whether or not the first stage managed a soft splashdown. That's probably what Elon's private jet was for.

(Sorry if this was obvious to some of you).

There was a cry of disappointment from the crowd but obviously it's hard to know exactly what that was about. More significantly, perhaps, one of the usual callouts is "stage 1 is transonic", which didn't happen, along with subsequent calls for landing burn and leg deploy.