Author Topic: SCRUB: Astra DARPA Challenge launch #1 Kodiak March 2, 2020  (Read 50600 times)

Offline brussell

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #80 on: 03/02/2020 07:54 pm »
T-5 minutes. GNC igniter system ready for launch.
GSE, not GNC

Offline Steven Pietrobon

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #81 on: 03/02/2020 07:55 pm »
Hold!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline zubenelgenubi

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #82 on: 03/02/2020 07:55 pm »
HOLD HOLD HOLD

Hold at T-53 seconds

Called by GNC officer--reason as yet unannounced.  GNC = Guidance, Navigation, and Control

If another launch attempt is made during today's launch window, the countdown would recycle to T-15 minutes.
« Last Edit: 03/02/2020 08:06 pm by zubenelgenubi »
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Offline Steven Pietrobon

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #83 on: 03/02/2020 07:56 pm »
Hold called by GNC officer at T-53 seconds.
« Last Edit: 03/02/2020 07:56 pm by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

There it is. I don't think I've ever seen a first-time launch get all the way through terminal count on the first try.
Wait, ∆V? This site will accept the ∆ symbol? How many times have I written out the word "delta" for no reason?

Offline lrk

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #85 on: 03/02/2020 08:09 pm »
Hot mike - something about a sensor giving bad data.

Offline zubenelgenubi

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #86 on: 03/02/2020 08:10 pm »
Earlier comment from Mike Curie that the countdown net was quiet, as the launch team was discussing options off-line.
« Last Edit: 03/02/2020 08:16 pm by zubenelgenubi »
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Offline Steven Pietrobon

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #87 on: 03/02/2020 08:12 pm »
Mike Curie is the Launch Challenge Analyst.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #88 on: 03/02/2020 08:24 pm »
"DARPA
@DARPA

1m
The range is currently "red" and live broadcast will resume after a roughly 30-minute break ~1650 EST. Reminder: the launch window today is open till 18:30 EST."

twitter.com/DARPA/status/1234589945077096448
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline ejb749

The rocket looks awfully close to that building.  Optical illusion?

Offline Steven Pietrobon

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #90 on: 03/02/2020 08:26 pm »
In a 30 minute hold.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #91 on: 03/02/2020 08:31 pm »
Now 25 minute hold.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline zubenelgenubi

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #92 on: 03/02/2020 08:34 pm »
In a 30 minute hold.
Hold music.  Was there a mention of the provenance of the "hold" music (example: SpaceX web casts)?
Support your local planetarium! (COVID-panic and forward: Now more than ever.) My current avatar is saying "i wants to go uppies!" Yes, there are God-given rights. Do you wish to gainsay the Declaration of Independence?

Offline Steven Pietrobon

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #93 on: 03/02/2020 08:40 pm »
15 minute hold.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #94 on: 03/02/2020 08:45 pm »
Heard something about bringing up some power to test the issue. 10 minute hold.
« Last Edit: 03/02/2020 08:45 pm by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #95 on: 03/02/2020 08:51 pm »
Five minutes left in the hold.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #96 on: 03/02/2020 09:00 pm »
They're back. Talking about problem. Little slow in fuelling, but not a problem. COLA was for ISS. Hold due to data that GNC saw that was off-nominal. Lot of systems working during the hold. Saw drop in voltage in FTS transmitter, which was replaced during the hold. Reconfigured helium pressurisation system to allow another launch attempt. Team went back in using a safe procedure.

Team still looking at data. If problem can be resolved then go back to T-15 minutes, otherwise its a scrub.
« Last Edit: 03/02/2020 09:02 pm by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #97 on: 03/02/2020 09:03 pm »
Back to the pad while we wait.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #98 on: 03/02/2020 09:23 pm »
Mike is back. Summarising today's events. Screen in background still shows a lot of red. Would need to resolve problem by 23:15 UTC, 15 minutes before the end of the window so as to resume the 15 minute count.
« Last Edit: 03/02/2020 09:25 pm by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Slothman

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Re: Astra DARPA Challenge launch #1 Kodiak March 2, 2020
« Reply #99 on: 03/02/2020 09:27 pm »
Does the frost on a rocket ever become so solid and attached to the vehicle due to prolonged holds/delays that it doesn't immediately fall off at lift off? How much would it weigh down the rocket?
« Last Edit: 03/02/2020 09:28 pm by Slothman »

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