Author Topic: SpaceX F9 : Starlink 6 (v1.0 L5) : Mar. 18, 2020 - Discussion (Read 129272 times)

Steven Pietrobon · « **Reply #120 on:** 03/15/2020 12:33 pm »

Chris has wrapped up. Das going over scrub.

RocketLover0119 · « **Reply #121 on:** 03/15/2020 12:34 pm »

https://twitter.com/SpaceX/status/1239182848076075009

Next opportunity will be confirmed with range.

FlattestEarth · « **Reply #122 on:** 03/15/2020 12:35 pm »

Quote from: sghill on 03/15/2020 12:27 pm

I didn't see any activity from the rain birds, even at t0:00

Yes, they should start at t-0:07. Could the lack of suppression water affect sensor readings for expected thrust?

Edit: on 39a they aren't fully on until t+0:03 and hard to see prior to that as seen in IFA launch

AndrewRG10 · « **Reply #123 on:** 03/15/2020 12:39 pm »

Quote from: AndrewRG10 on 03/14/2020 04:46 am

Recovery weather looks good. 1.5 metre waves and minimal winds and minimal gusts at altitudes below 20,000ft. Very good for the fairings. Looking like perfect launch, just got to hope it isn't jinxed and it fails on launch or landing or a parachute fails on the fairing.

Called it, you can never have a perfect launch (and landing) weather and conditions in spaceflight.

Let's hope it's a sensor issue and can recycle tomorrow.

MechE31 · « **Reply #124 on:** 03/15/2020 12:45 pm »

Has there been an abort after engine start since F9-7 in 2013?

fuchtherezer · « **Reply #125 on:** 03/15/2020 12:46 pm »

The water deluge system never activated. I wonder if that had anything to do with it?

scr00chy · « **Reply #126 on:** 03/15/2020 12:52 pm »

Quote from: MechE31 on 03/15/2020 12:45 pm

Has there been an abort after engine start since F9-7 in 2013?

SES-9 in 2016

CorvusCorax · « **Reply #127 on:** 03/15/2020 01:13 pm »

Quote from: FlattestEarth on 03/15/2020 12:35 pm

Quote from: sghill on 03/15/2020 12:27 pm
I didn't see any activity from the rain birds, even at t0:00

Yes, they should start at t-0:07. Could the lack of suppression water affect sensor readings for expected thrust?

Edit: on 39a they aren't fully on until t+0:03 and hard to see prior to that as seen in IFA launch

In past launches, they have been activating and leaking water straight down from T-10 seconds on.

Well visible in Es'hail-2
https://youtube.com/watch?v=PhTbzc-BqKs&t=893

Koreasat 5A:
https://youtube.com/watch?v=CNRTNxZSPhE&t=831

but not spraying full bore until T+2 seconds

Edit: How do I force the "time" t=xxx in links to youtube? it somehow disappears for the links

duke_templar · « **Reply #128 on:** 03/15/2020 01:25 pm »

Use & instead of ? for additional parameters, so &t=893.
? is the start of the parameters, & adds additional ones.

meekGee · « **Reply #129 on:** 03/15/2020 01:26 pm »

Quote from: CorvusCorax on 03/15/2020 12:51 pm

According to launch net audio, launch on the 15 of March was aborted just before liftoff due to a "high engine power" reading from (at least) one of the engines. Launch has been scrubbed until further notice.

Bummer, they would have gotten there sooner.

CorvusCorax · « **Reply #130 on:** 03/15/2020 01:33 pm »

Quote from: duke_templar on 03/15/2020 01:25 pm

Use & instead of ? for additional parameters, so &t=893.
? is the start of the parameters, & adds additional ones.

I changed that, with the effect the forum software turned it into previews - without using the time offset.

anyway, here are screenshots of the aborted launch
at T-7 seconds - no water
at T-3 seconds - occluded due to fog
at T+2 seconds - there is water but no full spray

amarkit · « **Reply #131 on:** 03/15/2020 01:44 pm »

Does anyone have insight into whether an abort like this would trigger the LAS on a Crew Dragon flight?

gongora · « **Reply #132 on:** 03/15/2020 01:47 pm »

Quote from: amarkit on 03/15/2020 01:44 pm

Does anyone have insight into whether an abort like this would trigger the LAS on a Crew Dragon flight?

I would hope not. The vehicle didn't appear to enter an unsafe condition.

haywoodfloyd · « **Reply #133 on:** 03/15/2020 01:55 pm »

That's the first thing I noticed at T-5 seconds that the water deluge system had not started.
I hope nothing was damaged by the acoustic vibration.

ugordan · « **Reply #134 on:** 03/15/2020 02:02 pm »

Quote from: haywoodfloyd on 03/15/2020 01:55 pm

That's the first thing I noticed at T-5 seconds that the water deluge system had not started.
I hope nothing was damaged by the acoustic vibration.

The primary purpose of the water spray is post-liftoff, to dampen acoustics reflected off the ground and launch mount back toward the vehicle.

SpaceFinnOriginal · « **Reply #135 on:** 03/15/2020 02:11 pm »

I noticed that landing legs are white. Is it frost from cooling or what?

CorvusCorax · « **Reply #136 on:** 03/15/2020 02:29 pm »

Quote from: SpaceFinnOriginal on 03/15/2020 02:11 pm

I noticed that landing legs are white. Is it frost from cooling or what?

No.

ChrisC · « **Reply #137 on:** 03/15/2020 02:40 pm »

Quote from: duke_templar on 03/15/2020 01:25 pm

Use & instead of ? for additional parameters, so &t=893.
? is the start of the parameters, & adds additional ones.

Quote from: CorvusCorax on 03/15/2020 01:33 pm

I changed that, with the effect the forum software turned it into previews - without using the time offset.

Delete the leading "www." to suppress NSF's auto-embed.

Besides the "&" delimiter, the "#" character also works, and make more sense to old-school HTML veterans.

Finally, note that timestamp formats like "t=893" and "t=14m53s" mean the same thing to Youtube.

Mammutti · « **Reply #138 on:** 03/15/2020 03:42 pm »

Looks like the next launch attempt will be on March 18 at 12:21 UTC.
Weather is 80% GO.

Rocket Science · « **Reply #139 on:** 03/15/2020 06:50 pm »

Great work with the abort SpaceX. Thanks for the excellent coverage NSF!