Author Topic: Delta IV-Heavy - NROL-91 - Vandenberg SLC-6 - 24 September 2022 (22:25 UTC)  (Read 60926 times)

Offline FutureSpaceTourist

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Offline FutureSpaceTourist

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https://twitter.com/torybruno/status/1574484921510498305

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Want to see some fire close up from my favorite secret SLC6 viewing spot?  (turn up the volume...). #NROL91

Offline FutureSpaceTourist

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https://twitter.com/torybruno/status/1574792184519327746

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Here’s a cool fisheye shot for all you flame trench fans. Don’t forget to turn up the sound. #NROL91

Offline FutureSpaceTourist

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https://twitter.com/torybruno/status/1574883933304537088

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OK.  By popular demand, my ultra secret, most favorite spot.  #NROL91

Offline Newton_V

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What a fun launch campaign that was.... and all the other Atlas ones too.  Great mission partners to work with, except the annoying guy next to me on launch day.  ;)
« Last Edit: 09/28/2022 02:10 am by Newton_V »

Offline Newton_V

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 :(

Offline FutureSpaceTourist

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Offline FutureSpaceTourist

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https://twitter.com/jdeshetler/status/1576645201581420545

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Another longer time lapse clip of Delta IV Heavy - NROL 91 with additional pre and post engine launch views. See people & trucks for a sense of scale.
@NASASpaceflight
nasaspaceflight.com/2022/09/delta-…

Offline Targeteer

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The pitch "up" after separation of the two side boosters is interesting.  How does the vehicle appear to "roll" slightly as well with a only a single center mounted engine?
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline DaveS

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The pitch "up" after separation of the two side boosters is interesting.  How does the vehicle appear to "roll" slightly as well with a only a single center mounted engine?
Same way the Delta II did: With a dedicated vernier engine. Using the Core Stage vernier engine, roll control is maintained after booster separation.
"For Sardines, space is no problem!"
-1996 Astronaut class slogan

"We're rolling in the wrong direction but for the right reasons"
-USA engineer about the rollback of Discovery prior to the STS-114 Return To Flight mission

Offline Welsh Dragon

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The pitch "up" after separation of the two side boosters is interesting.  How does the vehicle appear to "roll" slightly as well with a only a single center mounted engine?
Same way the Delta II did: With a dedicated vernier engine. Using the Core Stage vernier engine, roll control is maintained after booster separation.
No, it's through a vectored nozzle for the turbopump exhaust.

Offline kdhilliard

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No, it's through a vectored nozzle for the turbopump exhaust.
Yep.
From AIAA 2002-4324 Propulsion for the 21st Century—RS-68 (PDF), pg 3:
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Engine Specifics.
The new RS-68 is capable of operating in—and transitioning between—full power level and minimum power level upon command from the vehicle.  It also supplies pressurization gasses to vehicle fuel and oxidizer propellant tanks and thrust vector and roll control by gimbaling the thrust chamber assembly and the fuel turbine exhaust roll control nozzle.

Offline FutureSpaceTourist

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https://twitter.com/torybruno/status/1578509169245638656

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The real ULA sniper...
#DeltaIVHeavy #NROL91

Subtle bit of trolling by Tory!

Offline FutureSpaceTourist

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https://twitter.com/sabaton/status/1583518569287258114

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Did you know that @ulalaunch added our music to their space rocket launch recap video? We met ULA’s CEO, who brought us a scaled model of the Delta IV Heavy rocket & taught us about launches. What an experience!🤘 Watch the launch 👉 youtube.com/watch?v=pXifOi…

Offline Daniels30

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A Conversation with COL Chad Davis at NROL-91

“There are a thousand things that can happen when you go to light a rocket engine, and only one of them is good.” -
Tom Mueller, SpaceX Co founder and Propulsion CTO.


Offline B. Hendrickx

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What are purported to be ground-based images of NROL-91 (including a brief video) were posted on a Chinese forum:
https://weibo.com/1144755982/MmNr0zFtN

Offline Steven Pietrobon

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Here's the video and photo. Seems to be pointed the wrong way!
« Last Edit: 01/07/2023 01:31 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Newton_V

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Found an L-91 beer in the fridge.  Still tastes good.

 

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