Author Topic: Delta IV-Heavy - NROL-91 - Vandenberg SLC-6 - 24 September 2022 (22:25 UTC)  (Read 61266 times)

Offline FutureSpaceTourist

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Rocket for last West Coast DIV-H launch (NROL-91):

twitter.com/spaceoffshore/status/1428842616603488257

Quote
ULA's Rocketship is fast approaching its final destination at Vandenberg Space Force Base!

The ship will unload three booster cores for a Delta IV Heavy.

https://twitter.com/markbeavers12/status/1428864940551675907

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Don’t forget the second stage!!

twitter.com/spaceoffshore/status/1428866335786905602

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Wasn't sure if it was onboard. Only seen the three cores :S

https://twitter.com/markbeavers12/status/1428866584513236994

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In the very front along with the fairings.

https://twitter.com/spaceoffshore/status/1429469041601691651

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ULA's Rocketship has arrived in California!

The vessel is docked at the Port Hueneme, east of Vandenberg SFB.
« Last Edit: 09/24/2022 09:38 pm by FutureSpaceTourist »

Offline zubenelgenubi

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Cross-post with image attached; launch circa August 1, 2022.

(Don't book non-refundable plane tickets, hotel room, and vehicle rental just yet.)

Presented by Col. Melone at today's [September 7] SPRSA meeting.
« Last Edit: 09/25/2021 04:14 am by zubenelgenubi »
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Offline Newton_V

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Yep.  "circa" is a good word to use.

Anybody know who this is?

Offline zubenelgenubi

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Yep.  "circa" is a good word to use.

Anybody know who this is?
Ike, addressing American paratroopers and/or "glidertroopers" before D-Day?
« Last Edit: 09/25/2021 04:14 am by zubenelgenubi »
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Offline Newton_V

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Yep.  "circa" is a good word to use.

Anybody know who this is?
Ike, addressing American paratroopers and/or "glidertroopers" before D-Day?
Good guess, but nope!

Offline joek

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Anybody know who this is?

Brigadier General Anthony C. McAuliffe, Artillery Commander of the 101st Airborne Division, gives last-minute instructions before takeoff during the invasion of Holland.  72th Troop Carrier Squadron.  Photo from USAA Magazine January/February 2002.

Offline woods170

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Anybody know who this is?

Brigadier General Anthony C. McAuliffe, Artillery Commander of the 101st Airborne Division, gives last-minute instructions before takeoff during the invasion of Holland.  72th Troop Carrier Squadron.  Photo from USAA Magazine January/February 2002.


Question: why is a picture of a WW2 general featured in a thread about NROL-91?

Offline zubenelgenubi

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...
Anybody know who this is?
Brigadier General Anthony C. McAuliffe, Artillery Commander of the 101st Airborne Division, gives last-minute instructions before takeoff during the invasion of Holland.  72th Troop Carrier Squadron.  Photo from USAA Magazine January/February 2002.
Question: why is a picture of a WW2 general featured in a thread about NROL-91?
Newton_V foreshadowing a launch patch theme?
« Last Edit: 09/25/2021 04:15 am by zubenelgenubi »
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Offline Newton_V

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Anybody know who this is?
Brigadier General Anthony C. McAuliffe, Artillery Commander of the 101st Airborne Division, gives last-minute instructions before takeoff during the invasion of Holland.  72th Troop Carrier Squadron.  Photo from USAA Magazine January/February 2002.
Question: why is a picture of a WW2 general featured in a thread about NROL-91?
Newton_V foreshadowing a launch patch theme?
It's definitely a (the) theme.

Offline Vahe231991

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Did the NRO decide to set the launch date for the NROL-91 at the beginning of next August because they felt that scheduling the launch for the middle of 2022 could free up the NRO budget for NRO launches involving the Falcon and Minotaur?

Offline Jim

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Did the NRO decide to set the launch date for the NROL-91 at the beginning of next August because they felt that scheduling the launch for the middle of 2022 could free up the NRO budget for NRO launches involving the Falcon and Minotaur?

August would be near the end of the fiscal year

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United Launch Services LLC, Centennial, Colorado, has been awarded a $10,666,286 firm-fixed-price modification (P00024) to previously awarded FA8811-19-C-0002 contract for Delta IV heavy launch services. The contract modification is for Space Launch Complex (SLC)-37 non-routine facility expenses. Work will be performed at Cape Canaveral Space Force Station, Florida, and is expected to be completed by Oct. 1, 2022. Fiscal 2021 missile procurement funds in the amount of $10,666,286 will be obligated at the time of award, and the total cumulative face value of the contract is $1,304,953,956. Space Systems Command, Los Angeles Air Force Base, California, is the contracting activity.
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline zubenelgenubi

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Re: Delta IV-Heavy - NROL-91 - Vandenberg SLC-6 - August 2022
« Reply #12 on: 03/30/2022 04:33 am »
SFN Launch Schedule update, March 25 (one of many):
NROL-91 confirms launch in August 2022 from Vandenberg SLC-6--last Vandenberg Delta IV-Heavy.
« Last Edit: 03/30/2022 04:35 am by zubenelgenubi »
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Offline zubenelgenubi

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Re: Delta IV-Heavy - NROL-91 - Vandenberg SLC-6 - August 2022
« Reply #13 on: 06/29/2022 06:55 pm »
Any new news?  August is approaching fast.
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Offline Newton_V

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Re: Delta IV-Heavy - NROL-91 - Vandenberg SLC-6 - August 2022
« Reply #14 on: 07/01/2022 03:43 am »
Any new news?  August is approaching fast.
Still on track for a summer launch.

Offline xcel102

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Re: Delta IV-Heavy - NROL-91 - Vandenberg SLC-6 - August 2022
« Reply #15 on: 07/08/2022 03:13 am »
Still on track for a summer launch.
Still true after the Minotaur II+ explosion?

Offline Vahe231991

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Re: Delta IV-Heavy - NROL-91 - Vandenberg SLC-6 - August 2022
« Reply #16 on: 07/08/2022 03:57 am »
Still on track for a summer launch.
Still true after the Minotaur II+ explosion?
The launch of the NROL-91 atop the Delta IV Heavy is unaffected by the failed Minotaur II+ launch because the latter was carried out at the TP-01 facility, which was a launch site for the LGM-118 Peacekeeper, whereas the NROL-91 launch will be the last Delta IV launch from Vandenberg SFB.

Offline zubenelgenubi

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NROL-91 launch scheduled in late August?  I presume the Delta IV Heavy has been stacked for some time?

Would the Alpha launch overfly SLC-6?
Edit/answer: Upcoming 2nd launch--no.  Future launches, most of them to SSO--yes.

Or do the Alpha WDR and/or Static Fire pose a potential threat to NROL-91?

Or is it the reverse?  The DIVH WDR poses a potential threat to Alpha and SLC-2W?

And, what are the other launches?

Firefly gears up for second Alpha launch [dated Jul. 17]

Quote from: SpaceNews
Firefly Aerospace is preparing for the second launch of its Alpha rocket in late August or early September, hoping that a successful mission can enable a “step change” in activity for the company.
<snip>
Schumacher said [Firefly] will have to work around a few government launches scheduled, such as a Delta 4 Heavy launch of a National Reconnaissance Office payload. “If they don’t move, we’ll probably be looking at a launch in the first or second week of September,” he said. “If those government launches are delayed for any reason, we might be able to sneak into the last week of August.”

Edited
« Last Edit: 07/19/2022 03:18 pm by zubenelgenubi »
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Offline Vahe231991

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NROL-91 launch scheduled in late August?  I presume the Delta IV Heavy has been stacked for some time?

Would the Alpha launch overfly SLC-6?

Or do the Alpha WDR and/or Static Fire pose a potential threat to NROL-91?

Or is it the reverse?  The DIVH WDR poses a potential threat to Alpha and SLC-2W?

And, what are the other launches?

Firefly gears up for second Alpha launch [dated Jul. 17]

Quote from: SpaceNews
Firefly Aerospace is preparing for the second launch of its Alpha rocket in late August or early September, hoping that a successful mission can enable a “step change” in activity for the company.
<snip>
Schumacher said [Firefly] will have to work around a few government launches scheduled, such as a Delta 4 Heavy launch of a National Reconnaissance Office payload. “If they don’t move, we’ll probably be looking at a launch in the first or second week of September,” he said. “If those government launches are delayed for any reason, we might be able to sneak into the last week of August.”
The SLC-2W launch site for the Firefly Alpha is far north of the SLC-6 launch site, and the Firefly Alpha is designed to carry out flight trajectories to the west, unlike the Delta IV Heavy being used to launch payloads into polar orbit. Therefore, the Firefly Alpha can't overfly SLC-6.

Offline Jim

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The SLC-2W launch site for the Firefly Alpha is far north of the SLC-6 launch site, and the Firefly Alpha is designed to carry out flight trajectories to the west, unlike the Delta IV Heavy being used to launch payloads into polar orbit. Therefore, the Firefly Alpha can't overfly SLC-6.

No, Firefly Alpha is designed for sun synchronous orbits, which are polar and hence SLC-6 is affected by the flight path, just as it was for Delta II launches from SLC-2.

Offline Vahe231991

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The SLC-2W launch site for the Firefly Alpha is far north of the SLC-6 launch site, and the Firefly Alpha is designed to carry out flight trajectories to the west, unlike the Delta IV Heavy being used to launch payloads into polar orbit. Therefore, the Firefly Alpha can't overfly SLC-6.

No, Firefly Alpha is designed for sun synchronous orbits, which are polar and hence SLC-6 is affected by the flight path, just as it was for Delta II launches from SLC-2.
The Firefly Alpha isn't exclusively intended for sun-synchronous polar orbits, it's also designed to carry satellites into near-equatorial orbits on a westward path. The next Firefly Alpha launch won't be intended to reach polar orbit, but the third Alpha launch (now planned for November) will.

Offline Welsh Dragon

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The SLC-2W launch site for the Firefly Alpha is far north of the SLC-6 launch site, and the Firefly Alpha is designed to carry out flight trajectories to the west, unlike the Delta IV Heavy being used to launch payloads into polar orbit. Therefore, the Firefly Alpha can't overfly SLC-6.

No, Firefly Alpha is designed for sun synchronous orbits, which are polar and hence SLC-6 is affected by the flight path, just as it was for Delta II launches from SLC-2.
The Firefly Alpha isn't exclusively intended for sun-synchronous polar orbits, it's also designed to carry satellites into near-equatorial orbits on a westward path. The next Firefly Alpha launch won't be intended to reach polar orbit, but the third Alpha launch (now planned for November) will.
Erm come again? Westward equatorial orbits? Where did you see that? The performance hit for that would be astronomical.

Offline Vahe231991

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The SLC-2W launch site for the Firefly Alpha is far north of the SLC-6 launch site, and the Firefly Alpha is designed to carry out flight trajectories to the west, unlike the Delta IV Heavy being used to launch payloads into polar orbit. Therefore, the Firefly Alpha can't overfly SLC-6.
No, Firefly Alpha is designed for sun synchronous orbits, which are polar and hence SLC-6 is affected by the flight path, just as it was for Delta II launches from SLC-2.
The Firefly Alpha isn't exclusively intended for sun-synchronous polar orbits, it's also designed to carry satellites into near-equatorial orbits on a westward path. The next Firefly Alpha launch won't be intended to reach polar orbit, but the third Alpha launch (now planned for November) will.
Erm come again? Westward equatorial orbits? Where did you see that? The performance hit for that would be astronomical.
I meant to say orbital launches with a westward trajectory, not equatorial orbit, since Vandenberg SFB is north of the equator. But that doesn't change the fact that the next Firefly Alpha launch will launch on a westward trajectory.

Offline Jim

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The SLC-2W launch site for the Firefly Alpha is far north of the SLC-6 launch site, and the Firefly Alpha is designed to carry out flight trajectories to the west, unlike the Delta IV Heavy being used to launch payloads into polar orbit. Therefore, the Firefly Alpha can't overfly SLC-6.

No, Firefly Alpha is designed for sun synchronous orbits, which are polar and hence SLC-6 is affected by the flight path, just as it was for Delta II launches from SLC-2.
The Firefly Alpha isn't exclusively intended for sun-synchronous polar orbits, it's also designed to carry satellites into near-equatorial orbits on a westward path. The next Firefly Alpha launch won't be intended to reach polar orbit, but the third Alpha launch (now planned for November) will.

Jesse.  Just admit you are posting incorrect information (again).  Because Firefly Alpha is designed for sun synchronous orbits, it can fly over SLC-6.   THAT IS THE POINT


Online gongora

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For its next launch Firefly is going to 137 degrees and shouldn't go anywhere near SLC-6.  I expect that trajectory won't be commonly used after the initial test launch, but the conversation in this thread was about whether the upcoming Firefly and DIVH launches would conflict.

Offline Vahe231991

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For its next launch Firefly is going to 137 degrees and shouldn't go anywhere near SLC-6.  I expect that trajectory won't be commonly used after the initial test launch, but the conversation in this thread was about whether the upcoming Firefly and DIVH launches would conflict.
Maybe in a few days, photos will be released by ULA showing the components for the Delta IV Heavy earmarked for the NROL-91 launch being stacked up ahead of the launch next month.

Offline Jim

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For its next launch Firefly is going to 137 degrees and shouldn't go anywhere near SLC-6.  I expect that trajectory won't be commonly used after the initial test launch, but the conversation in this thread was about whether the upcoming Firefly and DIVH launches would conflict.
Maybe in a few days, photos will be released by ULA showing the components for the Delta IV Heavy earmarked for the NROL-91 launch being stacked up ahead of the launch next month.

It is already stacked

Offline zubenelgenubi

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The NextSpaceFlight page has listed this launch as NET September for some time.

Does anyone know why and can say?
« Last Edit: 07/31/2022 03:33 pm by zubenelgenubi »
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Offline Galactic Penguin SST

The NextSpaceFlight page has listed this launch as NET September for some time.

Does anyone know why and can say?

I've checked and it's in the DB as such since almost a year ago. I think it's meant to be "NET Q3 2022".
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Offline Vahe231991

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The NextSpaceFlight page has listed this launch as NET September for some time.

Does anyone know why and can say?

I've checked and it's in the DB as such since almost a year ago. I think it's meant to be "NET Q3 2022".
August is part of Q3. As someone has noted on this thread, NRO at times keeps planned launch dates for upcoming launches confidential until the rocket for NRO missions reaches the launch pad.

Offline zubenelgenubi

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SFN Launch Schedule update, August 15:
NROL-91 launch NET September.
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Offline Vahe231991

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Quote
Attention now moves to the west coast and the Delta IV Heavy rocket, which ULA is readying for a September launch with the NROL-91 mission. This mission for the National Reconnaissance Office will likely see the deployment of a heavy optical imaging satellite.

https://www.nasaspaceflight.com/2022/08/atlas-final-sbirs-geo/
[Aug 4]
« Last Edit: 08/17/2022 02:25 am by zubenelgenubi »

Offline Josh_from_Canada

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Launches Seen: Atlas V OA-7, Falcon 9 Starlink 6-4, Falcon 9 CRS-28,

Offline FutureSpaceTourist

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ULA photos
« Last Edit: 08/24/2022 11:22 pm by FutureSpaceTourist »

Offline Vahe231991

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ULA photos
Good to see photos of the Delta IV Heavy rocket earmarked for the NROL-91 launch.

Offline Rondaz

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NROL-91s Delta IV Heavy has been delivered and made vertical at Vandenberg! Integration of the fairing and encapsulated payload will follow.

Launch scheduled September 24
The final launch of DIVH from Vandenberg

https://twitter.com/ULaunchA360/status/1562726710373523464

Offline Newton_V

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That was all a couple months ago.  Wonder why it took so long to release these pics.

Offline russianhalo117

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NROL-91s Delta IV Heavy has been delivered and made vertical at Vandenberg! Integration of the fairing and encapsulated payload will follow.

Launch scheduled September 24
The final launch of DIVH from Vandenberg

https://twitter.com/ULaunchA360/status/1562726710373523464
Encapsulation and stacking should have already occurred per the notional timeline.
« Last Edit: 08/26/2022 02:06 am by russianhalo117 »

Offline zubenelgenubi

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September 24th
The ULA website has NROL-91 as the next ULA launch.  To me, that indicates it precedes the SES-20 and SES-21 launch.
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Offline Bubbinski

I’ll be in Lompoc on September 24th!

Is there an estimated launch time yet?
I'll even excitedly look forward to "flags and footprints" and suborbital missions. Just fly...somewhere.

Offline Newton_V

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I’ll be in Lompoc on September 24th!

Is there an estimated launch time yet?
Window open time is not released until NOTAMs come out.

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https://www.facebook.com/photo/?fbid=391949189790111&set=a.164921892492843

National Reconnaissance Office

#nrol91 culminates more than a decade of NRO Delta IV Heavy launches from Vandenberg Space Force Base. Let’s take a look back. 🚀
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline GWR64

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https://www.ulalaunch.com/missions/next-launch/delta-iv-heavy-nrol-91

Quote
The Delta Cryogenic Second Stage is a cryogenic liquid hydrogen/liquid oxygen-fueled vehicle, powered by a single RL10C-2-1 engine that produces 24,750 lbs (110.1 kilo-Newtons) of thrust.

Is the RL10C-2-1 used for the first time?
Is this (simplified): a RL10B-2 with a engine controller of the RL10A-4-2, with variable fuel mixture ratio?
The final -1 means modernized?
« Last Edit: 09/09/2022 08:59 am by GWR64 »

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Offline Vahe231991

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In a few weeks, Vandenberg bids farewell to the Delta SLV family, and the SLC-6 launch site will eventually be dismantled.

Offline Newton_V

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https://www.ulalaunch.com/missions/next-launch/delta-iv-heavy-nrol-91

Quote
The Delta Cryogenic Second Stage is a cryogenic liquid hydrogen/liquid oxygen-fueled vehicle, powered by a single RL10C-2-1 engine that produces 24,750 lbs (110.1 kilo-Newtons) of thrust.

Is the RL10C-2-1 used for the first time?
Is this (simplified): a RL10B-2 with a engine controller of the RL10A-4-2, with variable fuel mixture ratio?
The final -1 means modernized?
As you mentioned, the C's are B's with the PU motors from A's.
There are also A, B, and C cones, not to be confused with the RL10A, B, C.
I would say it's more like the RL10C-1 with the NEDS and bigger cone.
« Last Edit: 09/10/2022 02:02 am by Newton_V »

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A look back at analysis of the orbits of imagery satellites before the launch of NROL-82

https://sattrackcam.blogspot.com/2021/04/nrol-82-upcoming-new-kh-11-evolved.html
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline Jim

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In a few weeks, Vandenberg bids farewell to the Delta SLV family, and the SLC-6 launch site will eventually be dismantled.

We don’t know if it will be dismantled

Offline Fmedici

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Press Kit from NRO website

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So much for the launch window

National Reconnaissance Office  Facebook


LAUNCH UPDATE: One week from today, #NROL91 is scheduled to launch on the last United Launch Alliance Delta IV Heavy from the west coast at Vandenberg Space Force Base on September 24 at 2:53 p.m. PDT. Follow us on Twitter @natreconofc for launch updates.
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline Newton_V

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One week from today, if today is tomorrow.

Offline FutureSpaceTourist

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https://twitter.com/ulalaunch/status/1570873223285440514

Quote
A triple-core #DeltaIVHeavy rocket and its national security payload are vertically integrated for #NROL91 in service to @NatReconOfc and @USSF_SSC. Launch is Sept. 24 at 2:53pmPDT (5:53pmEDT; 2153 UTC) from Vandenberg SFB, CA.
 
Learn more in our blog: https://blog.ulalaunch.com/blog/nrol-91-delta-iv-heavy-readied-for-vandenberg-launch

Offline Ken the Bin

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NGA generic Hazardous Operations notices that appear to be for this launch (the same notice for two different Navigational Areas).

Quote from: NGA
122224Z SEP 22
HYDROPAC 2592/22(GEN).
EASTERN PACIFIC.
CALIFORNIA.
1. HAZARDOUS OPERATIONS:
   A. 242020Z TO 242347Z SEP, ALTERNATE
      2020Z TO 2347Z DAILY 25 THRU 27 SEP
      IN AREA BOUND BY
      33-53.00N 120-23.00W, 34-28.00N 120-40.00W,
      34-39.00N 120-40.00W, 34-39.00N 120-35.00W,
      34-27.00N 120-25.00W, 33-55.00N 120-18.00W.
   B. 242020Z TO 242345Z SEP, ALTERNATE
      2020Z TO 2345Z DAILY 25 THRU 27 SEP
      IN AREA BOUND BY
      25-18.00N 117-07.00W, 25-12.00N 117-27.00W,
      26-35.00N 117-53.00W, 26-41.00N 117-33.00W.
   C. 242020Z TO 242345Z SEP, ALTERNATE
      2020Z TO 2345Z DAILY 25 THRU 27 SEP
      IN AREA BOUND BY
      00-17.00S 121-28.00W, 00-07.00S 110-21.00W,
      03-24.00S 109-33.00W, 03-24.00S 110-21.00W.
   D. 242242Z TO 250133Z SEP, ALTERNATE
      2242Z TO 0133Z DAILY 25 THRU 27 SEP
      IN AREA BOUND BY
      17-57.00N 140-23.00W, 06-13.00N 137-52.00W,
      06-30.00N 136-25.00W, 18-15.00N 138-53.00W.
2. CANCEL THIS MSG 280233Z SEP 22.//
Quote from: NGA
122224Z SEP 22
NAVAREA XII 695/22(GEN).
EASTERN PACIFIC.
CALIFORNIA.
1. HAZARDOUS OPERATIONS:
   A. 242020Z TO 242347Z SEP, ALTERNATE
      2020Z TO 2347Z DAILY 25 THRU 27 SEP
      IN AREA BOUND BY
      33-53.00N 120-23.00W, 34-28.00N 120-40.00W,
      34-39.00N 120-40.00W, 34-39.00N 120-35.00W,
      34-27.00N 120-25.00W, 33-55.00N 120-18.00W.
   B. 242020Z TO 242345Z SEP, ALTERNATE
      2020Z TO 2345Z DAILY 25 THRU 27 SEP
      IN AREA BOUND BY
      25-18.00N 117-07.00W, 25-12.00N 117-27.00W,
      26-35.00N 117-53.00W, 26-41.00N 117-33.00W.
   C. 242020Z TO 242345Z SEP, ALTERNATE
      2020Z TO 2345Z DAILY 25 THRU 27 SEP
      IN AREA BOUND BY
      00-17.00S 121-28.00W, 00-07.00S 110-21.00W,
      03-24.00S 109-33.00W, 03-24.00S 110-21.00W.
   D. 242242Z TO 250133Z SEP, ALTERNATE
      2242Z TO 0133Z DAILY 25 THRU 27 SEP
      IN AREA BOUND BY
      17-57.00N 140-23.00W, 06-13.00N 137-52.00W,
      06-30.00N 136-25.00W, 18-15.00N 138-53.00W.
2. CANCEL THIS MSG 280233Z SEP 22.//

Offline Schlermie

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What is the launch trajectory for NROL-91?
« Reply #53 on: 09/19/2022 06:07 pm »
What is the launch trajectory for NROL-91 on Sep.24 from Vandenberg?

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Offline VLN

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The video shows a launch path close to the coast, east of due south. This is confirmed by the zones in Ken the Bin's post. It's about a 166 deg heading. Second stage comes down in the lower left.

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Thanks! It even says the flight azimuth at the end of the video.

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Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline Ken the Bin

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This NGA Space Debris notice looks like it might be associated with this launch.

Quote from: NGA
210354Z SEP 22
HYDROPAC 2616/22(22).
EASTERN SOUTH PACIFIC.
DNC 06.
1. HAZARDOUS OPERATIONS, SPACE DEBRIS
   1950Z TO 0015Z DAILY 24 THRU 27 SEP
   IN AREA BOUND BY
   03-24.00S 109-33.00W, 03-24.00S 110-21.00W,
   04-41.00S 110-02.00W, 04-30.00S 109-18.00W.
2. CANCEL THIS MSG 280115Z SEP 22.//

Offline Rondaz

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United Launch Alliance recently completed a countdown dress rehearsal and stacked a classified spy satellite payload on top of a Delta 4-Heavy rocket at Vandenberg Space Force Base, California, readying the triple-body launcher for liftoff Saturday.

https://twitter.com/SpaceflightNow/status/1572429384962932741

Offline Vahe231991

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Offline FutureSpaceTourist

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https://twitter.com/ulalaunch/status/1572737660178800642

Quote
Meteorologists predict a 90% chance of favorable weather for the #DeltaIVHeavy launch of #NROL91 at 2:53pmPDT (5:53pmEDT; 2153UTC) on Sat. from Vandenberg Space Force Base, CA.

Live blog begins at 5:15amPDT and webcast starts 20 minutes before liftoff: bit.ly/div_nrol91

Offline Rondaz

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122nd UP!

Saturday
2153 UTC / 17:53 EDT / 6:53 JST
Delta IV Heavy
NROL-91
🇺🇸
LEO

https://twitter.com/Nextlaunch/status/1572893368300236800

Offline FutureSpaceTourist

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https://twitter.com/ulalaunch/status/1573034541555777536

Quote
Attention West Coast! Wonder when you will see the #DeltaIVHeavy near you? Our visibility graphic shows when the rocket will rise into view during the launch of #NROL91.

Offline Rondaz

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#DeltaIVHeavy Fun Facts:

Height of #DeltaIVHeavy: 233 feet (71 meters)

Fuel onboard: 470,000 gallons of liquid hydrogen and liquid oxygen

Mass at liftoff: 1.6 million pounds (725,750 kg)

Thrust at liftoff: 2.1 million pounds (9.4 mega-Newtons)

https://twitter.com/ulalaunch/status/1572983083024158721

Offline Steven Pietrobon

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Here is my attempt at making a pdf version of the online press kit,
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Rondaz

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Upcoming launch of #NROL91 mission via #ULA's #DeltaIVHeavy vehicle..

https://twitter.com/_rykllan/status/1573234159027621889

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Offline FutureSpaceTourist

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https://twitter.com/ulalaunch/status/1573362219823558656

Quote
Leadership from ULA, @NatReconOfc and @SpaceForceDOD completed the Launch Readiness Review for the #DeltaIVHeavy #NROL91 mission giving a unanimous “GO" for tomorrow's launch at 2:53pmPDT (5:53pmEDT; 2153UTC). Weather is 90% favorable.

Launch blog: bit.ly/div_nrol91

Offline Vahe231991

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When the NROL-91 is launched for good, the US Space Force could potentially issue badges to ULA officials and employees featuring a lightning bolt and a hammer, given that the classic Delta SLVs were derived from the Thor ballistic missile (itself named for the Norse god of thunder).

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SpaceIntel101 graphic
The graphic says 98deg sun-sync orbit, but that's almost certainly wrong. It conflicts with the NOTAMs from 2 agencies, and with the video released by ULA.

Offline Jim

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When the NROL-91 is launched for good, the US Space Force could potentially issue badges to ULA officials and employees featuring a lightning bolt and a hammer, given that the classic Delta SLVs were derived from the Thor ballistic missile (itself named for the Norse god of thunder).

No, they don't issue badges with logos.

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https://twitter.com/torybruno/status/1573422960454557709

Quote
Just your average 10M pound building rolling back from a 30 story tall rocket. No big deal… #DeltaIVHeavy #NROL91 #ToryTimelapse @NatReconOfc

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https://twitter.com/w00ki33/status/1573519050776289280

Quote
The final west coast launch of the Delta IV Heavy is upon us. The rocket is prepped and ready for its NROL-91 mission tomorrow, 9/24, with window opening at 2:53 pm PDT.

@NASASpaceflight

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https://twitter.com/thejackbeyer/status/1573474641510744064

Quote
I’m at Vandenberg SFB’s legendary SLC-6 for remote camera setup - maybe for the last time. The final west coast Delta IV Heavy is slated to launch tomorrow on the NROL-91 mission. @NASASpaceflight

Offline FutureSpaceTourist

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https://twitter.com/w00ki33/status/1573579288342777857

Quote
Space Launch Complex 6, Vandenberg SFB. #NROL91

@NASASpaceflight

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Rollback timelapse:

https://twitter.com/ulalaunch/status/1573647240056430594

Quote
Good morning from Vandenberg Space Force Base in California where our live #DeltaIVHeavy blog has started and will take you all the way to the 2:53pmPDT (5:53pmEDT; 2153 UTC) launch time! The live launch webcast begins 20 minutes before liftoff: bit.ly/div_NROL91

Offline FutureSpaceTourist

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https://twitter.com/ulalaunch/status/1573649947106414593

Quote
The 9.5-hour countdown is starting at Vandenberg Space Force Base in California for #DeltaIVHeavy to launch #NROL91 at 2:53pmPDT (5:53pmEDT; 2153 UTC). This is ULA's 153rd mission, our 96th for U.S. national security and 32nd for the NRO. Follow along: bit.ly/div_NROL91

Offline FutureSpaceTourist

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https://twitter.com/ulalaunch/status/1573656123973976064

Quote
#DeltaIVHeavy is powering up for launch and preps are underway at Space Launch Complex-6 for retraction of the Mobile Service Tower. The forecast for the 2:53pmPDT (5:53pmEDT; 2153 UTC) launch continues to indicate a 90% chance of acceptable weather. bit.ly/div_nrol91

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https://twitter.com/ulalaunch/status/1573669788047507457

Quote
The Mobile Service Tower has begun to retract from the #DeltaIVHeavy rocket. An undercarriage transport system is rolling on rail tracks to move the 32-story, 13-million-pound building at a top speed of 0.25 miles per hour. bit.ly/div_nrol91

https://twitter.com/ulalaunch/status/1573670907335376902

Quote
The sun is beginning to rise on #DeltaIVHeavy launch day. Mobile Service Tower rollback is getting started on this foggy morning at Space Launch Complex-6. 

bit.ly/div_nrol91

https://twitter.com/ulalaunch/status/1573672385319952384

Quote
The sweet sounds of moving the 32-story, 13-million-pound Mobile Service Tower. bit.ly/div_nrol91
« Last Edit: 09/24/2022 01:56 pm by FutureSpaceTourist »

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https://twitter.com/w00ki33/status/1573672216100601856

Quote
Carbon-based life forms give scale to the massive Delta IV Heavy rocket. #NROL91

@NASASpaceflight

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https://twitter.com/ulalaunch/status/1573676502339698693

Quote
Rollback of the MST signals a major milestone at the start of launch day operations. Configuring launch pad systems and securing equipment will be completed over the next couple of hours before all personnel clear the site for fueling.

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The mobile service tower at the SLC-6 launch pad in California has retracted to reveal with Delta 4-Heavy rocket for liftoff today at 2:53pm PDT (5:53pm EDT; 2154 GMT), carrying a classified US government spy satellite into orbit.

https://twitter.com/SpaceflightNow/status/1573690121743872000

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United Launch Alliance will move out of Space Launch Complex 6 in California after the flight of a Delta rocket Saturday, leaving the military to find a new tenant for the historic launch pad once intended to host space shuttle missions on the West Coast.

https://twitter.com/SpaceflightNow/status/1573685703292047360

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https://twitter.com/ulalaunch/status/1573684390344986624

Quote
The flight control operational test for the #DeltaIVHeavy has been completed successfully. This test is known as flight slews, which performs gimbal checks of the rocket's engine nozzles in a state prior to cryogenic fueling.

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https://twitter.com/ulalaunch/status/1573692521699573767

Quote
The #NROL91 countdown continues and we are tracking no constraints to our 2:53pmPDT (5:53pmEDT; 2153 UTC) launch time today at Vandenberg Space Force Base in California for #DeltaIVHeavy.
« Last Edit: 09/24/2022 03:49 pm by FutureSpaceTourist »

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https://twitter.com/ulalaunch/status/1573703275853094915

Quote
The countdown is entering the final six hours until liftoff of #NROL91. The ground-provided environmental control system has switched to supply conditioned nitrogen gas rather than air to #DeltaIVHeavy in preparation for the cryogenic fueling.

https://twitter.com/ulalaunch/status/1573704784615542785

Quote
In the pre-fueling weather briefing, Launch Weather Officer Capt. Isabella Relyea indicates that conditions along the Central Coast of California are acceptable for proceeding into cryogenic tanking operations at Space Launch Complex-6. bit.ly/div_nrol91

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https://twitter.com/ulalaunch/status/1573706000909082625

Quote
The countdown has entered the first of two planned holds scheduled in today's timeline. Near the end of  this hold, Launch Conductor Scott Barney will poll the team to verify all systems are ready to proceed into #DeltaIVHeavy fueling operations. bit.ly/div_nrol91

Offline FutureSpaceTourist

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https://twitter.com/ulalaunch/status/1573727469307367425

Quote
We are counting down to #DeltaIVHeavy launch at 2:53pmPDT (5:53pmEDT; 2153 UTC), and all systems are "go" here at Vandenberg's launch control center and at Space Launch Complex-6. The team is working no issues in the countdown and weather is green.

Offline Bob Shaw

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Any speculation on the next user(s) of SLC-6?

Polar orbital Starships, anyone?

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https://twitter.com/ulalaunch/status/1573730384667353090

Quote
Fueling operations have begun at Space Launch Complex-6. The first step in tanking procedures is the thermal conditioning of the liquid hydrogen systems on the #DeltaIVHeavy three common booster cores.

Don't miss a thing by following along in our blog: bit.ly/div_nrol91

Edit to add:

https://twitter.com/ulalaunch/status/1573735754198564866

Quote
Fueling is proceeding by loading with 330,000 gallons of super-cold liquid hydrogen that is chilled to minus-423 degrees Fahrenheit into #DeltaIVHeavy's three common booster cores. The propellant will feed the RS-68A main engines during launch. bit.ly/div_nrol91
« Last Edit: 09/24/2022 06:08 pm by FutureSpaceTourist »

Offline Jim

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Any speculation on the next user(s) of SLC-6?

Polar orbital Starships, anyone?


nobody wants to deal with the cost of maintenance

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https://twitter.com/ulalaunch/status/1573741892981985283

Quote
Three common booster cores are being filled with 120,000 gallons of liquid oxygen, chilled to Minus-298 degrees F, as the #NROL91 countdown continues to liftoff at 2:53pmPDT (5:53pmEDT; 2153 UTC). bit.ly/div_nrol91

Edit to add:

https://twitter.com/ulalaunch/status/1573746400327770113

Quote
The #DeltaIVHeavy's Delta Cryogenic Second Stage is ready to begin receiving 10,000 gallons of liquid hydrogen for launch. Activities continue to progress smoothly in the countdown.
« Last Edit: 09/24/2022 06:50 pm by FutureSpaceTourist »

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https://twitter.com/ulalaunch/status/1573752566349004802

Quote
The loading of 6,000 gallons of liquid oxygen into the Delta Cryogenic Second Stage of the #DeltaIVHeavy rocket is now getting started. This is the last of the rocket's cryogenic tanks to be filled in today's countdown.

Live reports from launch control: bit.ly/div_nrol91

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Liquid hydrogen & oxygen loading is underway on the Delta 4-Heavy rocket's three common booster cores.

In a departure from most Delta launches in the last 20 years, @ulalaunch isn't allowing news media to listen to the countdown net during tanking today.

https://twitter.com/SpaceflightNow/status/1573744937920626688

Offline FutureSpaceTourist

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https://twitter.com/ulalaunch/status/1573762847527604234

Quote
We are entering the final two hours until liftoff of Delta 387. Carrying on a tradition from legacy Delta rockets, this #DeltaIVHeavy has its flight number -- 387 -- printed in the Delta triangle on the interstage.

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https://twitter.com/ulalaunch/status/1573775320439816194

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Fuel-loading is wrapping up for #DeltaIVHeavy to produce a 1.6-million-pound rocket for launch at 2:53pmPDT (5:53pmEDT; 2153 UTC) from Vandenberg AFB, CA. bit.ly/div_nrol91

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ULA webcast is live

« Last Edit: 09/24/2022 09:35 pm by FutureSpaceTourist »

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Webcast has begun.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Wind 7.7-8.2 m/s.
Temperature 20.6 C.
Visibility 8-11 km.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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https://twitter.com/ulalaunch/status/1573788629729742848

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NEW LAUNCH TIME.  ULA Launch Director Tom Heter III has instructed the launch team to coordinate a new liftoff time of 3:25:30 p.m. PDT (6:25:30 p..m. EDT;  2225:30 UTC) for the #DeltaIVHeavy rocket on the #NROL-91 mission today.

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New T-0 of 3:25:30 pm local (22:25:30 UTC).
« Last Edit: 09/24/2022 09:39 pm by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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L-40 minutes. Showing previous Delita IV Heavy launches from Vandenberg.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Mission logo and launch dedication.
« Last Edit: 09/24/2022 09:49 pm by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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https://twitter.com/ulalaunch/status/1573790658120372224

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The combined launch teams here at Vandenberg are monitoring systems on the #DeltaIVHeavy, pad equipment and downrange assets. Weather remains in our favor.

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L-35 minutes.
« Last Edit: 09/24/2022 09:51 pm by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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L-30 minutes. The mission director gave a launch dedication to the NRO members whose names are also on the vehicle.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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1) Helium bubble passed through system which caused a temperature change.
2) Fill drain valves, getting them to cycle. Standard cycle at L-25 minutes.
3) Turbine supply valve setting. Condition not expected but understood.

Asking about engine OTC has being cleared.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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L-25 minutes. Showing video on Thor/Delta history.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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L-20 minutes. The Delta II.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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L-15 minutes. Vulcan Centaur video.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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L-10 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Troubleshooted fill and drain valves. Cycled them 10 times. Good to go.

L-8 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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L-7 minutes. Performing poll.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Go for launch.

L-6 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-4 minutes and counting.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-3 minutes.

MTS internal.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-2 minutes.

Launch sequencer start.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T-1 minute. Range green.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Liftoff!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+1 minute.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+2 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+3 minutes. All engines showing good performance.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Booster separation.

T+4 minutes.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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T+5 minutes.
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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Booster separation.

Nozzle extension and ignition.

Fairing separation.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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End of coverage. Showing launch replay.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Here's a view of the control room and first stage separation, which I missed previously.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline eric z

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 Great launch! What a majestic vehicle. Thanks Steven for your great coverage. Congratulations to Space Force, NRO. and ULA for their dedication and hard work.

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https://twitter.com/nasaspaceflight/status/1573804623177125890

Quote
A slightly longer clip of ignition for those who are new to seeing Delta IV Heavy setting itself on fire (it's normal)😅

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twitter.com/nasaspaceflight/status/1573802121891389440

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Staging the strap-on boosters.

https://twitter.com/nasaspaceflight/status/1573802713812553729

Quote
On to the upper stage.

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https://twitter.com/thejackbeyer/status/1573808482469322752

Quote
The last Delta IV Heavy to launch from the west coast lofting the NROL-91 mission into orbit. Beautiful. Hopefully this isn't the end for SLC-6 but if it was, it was a fitting one. #NROL91 @NASASpaceflight

Article: nasaspaceflight.com/2022/09/delta-…

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« Last Edit: 09/24/2022 11:09 pm by FutureSpaceTourist »

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More ULA launch photos

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View of the last Vandenberg Delta IV launch from LA

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On the ULA blog the official launch time is started as 22:25:30.144 UTC
Launches Seen: Atlas V OA-7, Falcon 9 Starlink 6-4, Falcon 9 CRS-28,

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https://twitter.com/w00ki33/status/1573823933001789440

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Delta IV Heavy’s engines punching through the atmosphere. #NROL91

@NASASpaceflight

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A couple of pictures from Gaviota peak.  Hard to get close to SLC-6 without credentials.  2100 foot climb - kind of relentless but there were 4 other people up there today and all of them were there for the launch.

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Mission success! Congratulations to ULA and NRO for the successful launch!

"MISSION SUCCESS! United Launch Alliance's #DeltaIVHeavy rocket successfully launched #NROL91 for @NatReconOfc and @SpaceForceDoD. Success #153 for ULA! Thank you to our customers for the trust they place in us! #PartnersInSpace "

https://twitter.com/ulalaunch/status/1573836023901175809
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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https://www.ulalaunch.com/about/news-detail/2022/09/25/united-launch-alliance-successfully-launches-national-security-mission-with-nation-s-proven-heavy-lift-vehicle

United Launch Alliance Successfully Launches National Security Mission with Nation’s Proven Heavy Lift Vehicle
Delta IV Heavy continues to deliver high priority missions in support of National Security

Vandenberg Space Force Base, Calif., (Sept. 24, 2022) – A United Launch Alliance (ULA) Delta IV Heavy rocket carrying the NROL-91 mission for the National Reconnaissance Office (NRO) lifted off on Sept. 24 at 3:25 p.m. PDT from Space Launch Complex-6 at Vandenberg Space Force Base. To date ULA has launched 153 times with 100 percent mission success.

"The NRO has been, and continues to be, a phenomenal partner through 32 collaborative launch campaigns, stemming from ULA’s very first launch in 2006," said Gary Wentz, ULA vice president of Government and Commercial Programs. “This mission was ULA’s 96th National Security mission and the NRO’s 10th mission on board a Delta IV Heavy launch vehicle – a history that we are very proud of.”

“This was also ULA’s 95th Delta mission from Vandenberg Space Force Base and our fifth and final Delta IV Heavy from the West Coast, completing a long, successful tenure of delivering critical national security payloads,” added Wentz. “We look forward to preparing Space Launch Complex-3 for future Vulcan flights from the West Coast.”

ULA’s next launch is a commercial launch of the SES-20 and SES-21 mission, planned for Sept. 30 from Cape Canaveral Space Force Station, Florida.

Leveraging a legacy of 100 percent mission success launching more than 150 missions to explore, protect and enhance our world, ULA is the nation’s most experienced and reliable launch service provider with world-leading reliability, schedule confidence, and mission optimization. We deliver value unmatched by any launch services company in the industry, a tireless drive to improve, and commitment to the extraordinary.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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https://twitter.com/thejackbeyer/status/1573874977966653440

Quote
NROL-91 Remote Camera Imagery is in! A fitting farewell to mighty Delta IV Heavy and SLC-6. #NROL91 @NASASpaceflight

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https://twitter.com/moontomarsquest/status/1573887536283283459

Quote
Just now got back from SLC-6 picking up our cameras..everyone got some great #DeltaIVHeavy launch photos. I turned & snapped this, members from our group taking pictures..sad really to think #SLC6 is now a permanent empty nest. Beautiful view.. @torybruno  @DaneDrefke @ulalaunch

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On the ULA blog the official launch time is started as 22:25:30.144 UTC
ULA live update:
https://www.ulalaunch.com/missions/archived-launched/delta-iv-heavy-nrol-91
Quote
Sep 25 02:27

Our official liftoff time was 3:25:30.114 p.m. Pacific Daylight Time.

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Archived launch video:


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https://sattrackcam.blogspot.com/

NROL-91: a new (possibly electro-optical) sister ship of USA 290


And Marco spotted it in orbit already

http://www.satobs.org/seesat/Sep-2022/0140.html
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

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Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

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And as a final orange flame flickers into the night at SLC-6… an 11 year reign of the most massive rocket to rattle the West Coast comes to a close, ending a lineage going back to Vandenberg’s first flight nearly 64 years and 2,000 launches ago.

Hard to express the emotions from this launch. Slick Six will be back someday, hopefully, but it probably won’t look the same. I’m glad to have been here as my first media launch, and my 17th in person. My first launch ever was NROL-45—an IV Medium. This feels fitting.

https://twitter.com/lavie154/status/1573920947047845888
« Last Edit: 09/25/2022 01:38 pm by Rondaz »

Offline Vahe231991

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And as a final orange flame flickers into the night at SLC-6… an 11 year reign of the most massive rocket to rattle the West Coast comes to a close, ending a lineage going back to Vandenberg’s first flight nearly 64 years and 2,000 launches ago.

Hard to express the emotions from this launch. Slick Six will be back someday, hopefully, but it probably won’t look the same. I’m glad to have been here as my first media launch, and my 17th in person. My first launch ever was NROL-45—an IV Medium. This feels fitting.

https://twitter.com/lavie154/status/1573920947047845888
The Delta IV Heavy, like the now-retired single-stick Delta IV, shares little in common with all Delta SLV variants except the name Delta. The first Thor orbital launch with Delta upper stage occurred in 1960, while the first launch from Vandenberg of a Thor-derived rocket bearing the Delta name was in October 1966. Hence, the NROL-91 launch ends a nearly 54-year run of space launches from Vandenberg using orbital rockets bearing the name Delta (all Thor-Delta launches were conducted from Cape Canaveral).

Offline FutureSpaceTourist

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https://twitter.com/marco_langbroek/status/1573902857266405376

Quote
The #classified payload of the #NROL91 launch a few hrs ago was observed by me near 4: 17 UTC from #Leiden, the Netherlands, in a partly cloudy sky, as a magn. +2.5 to +3 object.
Image with a Canon EOS 80D + Samyang 1.4/35 mm, 5s, ISO 800.
@planet4589 @cgbassa @OrbitalFocus

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The Delta IV Heavy, like the now-retired single-stick Delta IV, shares little in common with all Delta SLV variants except the name Delta.

nope.  they had same avionics.  Delta III and Delta IV M4 shared an upper stage



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https://twitter.com/w00ki33/status/1574134652494749696

Quote
Well, my first Delta IV Heavy launch far exceeded my expectations. The NROL-91 mission was a fulfilling experience, and a successful finale to this rocket’s West Coast cadence. Congratulations to all involved!

@NASASpaceflight

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https://twitter.com/w00ki33/status/1574188836829024256

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A short clip of Delta IV Heavy burning off excess hydrogen during the rocket's ignition sequence. #NROL91

@NASASpaceflight

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https://twitter.com/jdeshetler/status/1574231916579983360

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Wide angle shot of ULA Delta IV Heavy - NROL-91 successfully launched from Vandenberg SFB yesterday. @NASASpaceflight

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Was the Delta IV the last Western Range user of the RF FTS system?

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Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

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https://twitter.com/jdeshetler/status/1574235302805192704

Quote
Slow motion shot of engine ignitions on the rear of Delta IV Heavy - NROL-91 as it successfully launched from Vandenberg SFB yesterday.
@NASASpaceflight

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https://twitter.com/ulalaunch/status/1574426646639157248

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LAUNCH HIGHLIGHTS! 🚀

On Sat. Sept. 24 at 3:25 p.m. PDT the most metal of rockets, the ULA #DeltaIVHeavy, lifted off with the @NatReconOfc's #NROL91 mission.
 
Music by @sabaton, @torybruno's favorite heavy metal band! 🎸🔥

« Last Edit: 09/26/2022 03:55 pm by FutureSpaceTourist »

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 »

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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-…

Online 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."

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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.

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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…

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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.


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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

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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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