Author Topic: Delta IV-H - NROL-71 - (19:10 UTC) January 19, 2019  (Read 89849 times)

Online Steven Pietrobon

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #340 on: 01/19/2019 06:12 pm »
T+1 minute.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online Steven Pietrobon

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #341 on: 01/19/2019 06:13 pm »
T+2 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Targeteer

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #342 on: 01/19/2019 06:13 pm »
spectacular view
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline mainmind

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #343 on: 01/19/2019 06:13 pm »
Core booster went to "partial thrust mode" shortly after liftoff. Anyone know what level of thrust the core booster drops to at this point? 50%? 30%?

Thanks

Online Steven Pietrobon

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #344 on: 01/19/2019 06:13 pm »
T+3 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online Steven Pietrobon

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #345 on: 01/19/2019 06:15 pm »
T+4 minutes. Booster separation.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online Chris Bergin

Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #346 on: 01/19/2019 06:15 pm »
Nice staging.

Online Steven Pietrobon

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #347 on: 01/19/2019 06:16 pm »
T+5 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online Steven Pietrobon

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #348 on: 01/19/2019 06:18 pm »
First stage separation.

Second stage ignition.

Fairing separation.
« Last Edit: 01/19/2019 06:19 pm by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online ZachS09

Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #349 on: 01/19/2019 06:18 pm »
Core booster went to "partial thrust mode" shortly after liftoff. Anyone know what level of thrust the core booster drops to at this point? 50%? 30%?

Thanks

During partial thrust mode, the center core's main engine throttles down to 58%.
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Offline gtae07

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #350 on: 01/19/2019 06:21 pm »
It seems as though the vehicle rolls to put the boosters vertically ("top and bottom") until through most of the atmosphere, then it rolls "level" for jettison.  Then it seems to roll about 45 degrees after that.

I'm guessing the "top and bottom" position reduces aerodynamic loads during pitchover, but why the odd bank angle after jettison?

Online Llian Rhydderch

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #351 on: 01/19/2019 06:21 pm »
Liftoff and the first six or so minutes of the trajectory looked awesome.  Congrats to ULA on that!

But, darn, they're gonna crash all three of those multi-tens-of-million-dollars booster stages into the ocean.  And only use them once.  Throw them away.  ???

Can you believe it?   :o
« Last Edit: 01/19/2019 06:22 pm by Llian Rhydderch »
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Online Steven Pietrobon

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #352 on: 01/19/2019 06:21 pm »
End of launch coverage. Post is a bit late as the video stopped on me.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online zubenelgenubi

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #353 on: 01/19/2019 06:25 pm »
Spectacular views of the ascent, from the ground, on-board, even a little ground-based IR!

Great "internal" view of booster and first stage separations.

Did we see a bit of the RL-10 nozzle extension?

And, we got a good view of a discarded PLF half oscillating as it fell behind.

Thanks, Steven!
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Online Chris Bergin

Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #354 on: 01/19/2019 06:26 pm »
And now we wait!

Thanks again to Steven for the coverage!

Offline Mapperuo

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #355 on: 01/19/2019 06:33 pm »
- Aaron


Offline FutureSpaceTourist

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #357 on: 01/19/2019 06:42 pm »
https://twitter.com/ulalaunch/status/1086709493327491072

Edit to add: ULA have now released higher res version (2nd attachment)
« Last Edit: 01/19/2019 07:54 pm by FutureSpaceTourist »


Online edkyle99

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Re: Delta IV-H - NROL-71 - January 19, 2019
« Reply #359 on: 01/19/2019 07:08 pm »
The following puts forward what seems to me a good argument for NROL-71 being a "Lacrosse Follow-on" rather than a new KH-11.
https://sattrackcam.blogspot.com/2018/12/nrol-71-enigmatic-launch.html

It's a shame the way ULA is treating space reporters now, ending the audio feed and serving up that purposely intrusive gawdawful crawl on their video.  I'm going to make ULA images on my web site one pixel smaller. 

 - Ed Kyle
« Last Edit: 01/19/2019 07:16 pm by edkyle99 »

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