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B1091 "A Heavy Core in Falcon 9 Clothing"
NASASpaceFlight.com ^ | August 12, 2025 | Ryan Caton

Posted on 08/16/2025 10:17:27 AM PDT by SunkenCiv

SpaceX's recent launch involved another successful landing of its Falcon 9 booster, but this time marked a Falcon Heavy center core booster launching and landing as a single-stick Falcon 9 rocket.

The booster, designated B1091, powered the KF-02 mission, deploying 24 satellites for Amazon's Project Kuiper broadband constellation into low Earth orbit. This event marks a technical first for the company, blending elements of its Falcon 9 and Falcon Heavy programs...

At first glance, the launch appeared to be a standard Falcon 9 mission. However, B1091 is no ordinary booster. As revealed by SpaceX Vice President of Falcon and Dragon, Jon Edwards, in a May 2025 post on X, B1091 was originally built as a Falcon Heavy center core.

"B1091 is in fact a Falcon Heavy center core that will fly in a single stick configuration a handful of times before being reconfigured and flying as a Falcon Heavy," Edwards stated. "This way we get some use out of it while the Heavy customer finishes up the payload while also reducing risk as it will be flight proven."

Falcon Heavy center cores differ significantly from standard Falcon 9 boosters. Designed to withstand the intense stresses of being flanked by two side boosters, center cores feature thicker tank walls, additional structural supports, and reinforced attachment points.

In contrast, Falcon Heavy side boosters are nearly identical to Falcon 9 cores, requiring only minor integration hardware and aerodynamic nosecones.

(Excerpt) Read more at nasaspaceflight.com ...


TOPICS: Astronomy; Business/Economy
KEYWORDS: amazon; b1091; elonmusk; falcon9; falconheavy; kf02; projectkuiper; spacex; starlink

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Ben Cooper for SpaceX
Lead image: Ben Cooper for SpaceX

1 posted on 08/16/2025 10:17:27 AM PDT by SunkenCiv
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To: AdmSmith; AnonymousConservative; Arthur Wildfire! March; Berosus; Bockscar; BraveMan; cardinal4; ...
The theoretical max payload (that is, what the engines and their fuel will throw into orbit) is or at least has been constrained by the structural strength of the core boosters.

Crossfeeding was also considered for the Falcon Heavy, but was rejected in favor of underthrottling the core until the side boosters were shut down (or expended) and jettisoned.

2 posted on 08/16/2025 10:20:37 AM PDT by SunkenCiv (NeverTrumpin' -- it's not just for DNC shills anymore -- oh, wait, yeah it is.)
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To: SunkenCiv

Some cool innovation! Love it.


3 posted on 08/16/2025 10:26:00 AM PDT by Theophilus (covfefe)
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To: SunkenCiv

Now here’s a double irony:

1. SpaceX launched 24 satellites for Amazon’s Project Kuiper broadband constellation — a competitor to StarLink!
2. Bezos has to depend on SpaceX to launch his satellites and cannot use his own Blue Origin rockets.


4 posted on 08/16/2025 10:27:33 AM PDT by ProtectOurFreedom
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To: SunkenCiv
As of August 14, 2025, there are 8,164 Starlink satellites in orbit, with 8,135 working and 7,103 operationa. The number changes frequently due to new launches and deorbiting of older satellites.

As of August 11, 2025, Amazon's Project Kuiper has 102 satellites in orbit. I suppose that number is now 126 with the B1091 launch and satellite deployment.

Bezos is still doing human suborbital flights and has 1/80 the number of satellites in orbit as StarLink.

What an amazing commanding lead by Musk!

5 posted on 08/16/2025 10:31:50 AM PDT by ProtectOurFreedom
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To: SunkenCiv

A technology bump. All right, I may be forced to admit that this heavier-than-air flight thing might be possible after all...


6 posted on 08/16/2025 10:32:05 AM PDT by Billthedrill
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To: ProtectOurFreedom

Definitely. The fact that Amazon has to resort to SpaceX, and SpaceX doesn’t feel particularly threatened, shows who has the edge, and will probably keep it for decades.

Check 6 Podcast: How Starlink Became SpaceX’s Cash Cow
AviationWeek
44.6K subscribers
August 8, 2025
https://www.youtube.com/watch?v=PYhtMxcpYtY


7 posted on 08/16/2025 10:36:11 AM PDT by SunkenCiv (NeverTrumpin' -- it's not just for DNC shills anymore -- oh, wait, yeah it is.)
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To: Theophilus

Just recently, SpaceX’s Falcon 9 launches passed the 500 mark, with 400+ booster landings for reuse. I suspect that these core boosters may begin to see more work, with heavier loads and bigger fairings, if the Starship develop continues to stall. OTOH, just because they run a little late doesn’t mean they don’t get where they’re going. :^)


8 posted on 08/16/2025 10:39:11 AM PDT by SunkenCiv (NeverTrumpin' -- it's not just for DNC shills anymore -- oh, wait, yeah it is.)
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To: Billthedrill

Hey! Let’s not jump to conclusions! 😊


9 posted on 08/16/2025 10:39:38 AM PDT by SunkenCiv (NeverTrumpin' -- it's not just for DNC shills anymore -- oh, wait, yeah it is.)
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To: SunkenCiv

Not only that but think of how much less expensive it is for SpaceX to launch satellites into space compared to other countries.

China and Russia get to watch the launches just like we all do but can’t duplicate the feat of launching, landing and reusing the boosters.

Since no one has been able duplicate what SpaceX has been doing for years proves how technically challenging it must be.


10 posted on 08/16/2025 10:41:15 AM PDT by srmanuel
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To: SunkenCiv

Cant wait for Starship10!


11 posted on 08/16/2025 10:56:44 AM PDT by Theophilus (covfefe)
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To: ProtectOurFreedom

“I suppose that number is now 126 with the B1091 launch and satellite deployment. ... Bezos is still doing human suborbital flights and has 1/80 the number of satellites in orbit as StarLink.”

maybe launching a few Bezos satellites is way to get Bezos to pay for SpaceX R & D costs ...


12 posted on 08/16/2025 11:10:24 AM PDT by catnipman ((A Vote For The Lesser Of Two Evils Still Counts As A Vote For Evil))
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To: srmanuel

I had to laugh at the recent announcement of a successful Ariane rocket launch. I can’t remember the last time I read about an Ariane rocket launch.


13 posted on 08/16/2025 11:14:15 AM PDT by ProtectOurFreedom
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To: ProtectOurFreedom
Ariane rocket launch

Ariane rocket launch, billions and billions $$$$ for each launch.

Not reusable

Therefore, to use the wacky woke vernacular, it is not sustainable.

Every time Elon Musk and SpaceX launch/test, Robert Heinlein is smiling down from Heaven. .

14 posted on 08/16/2025 11:41:09 AM PDT by Ronaldus Magnus III (Do, or do not, there is no try )
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To: Ronaldus Magnus III

Ariane launches are $160ish million. More than SpaceX, but it’s not billions and billions.


15 posted on 08/16/2025 11:44:40 AM PDT by Owen
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To: srmanuel

Never underestimate the creativity of any human!
Societies in China and Russia are very rigid.
Going against the “Grain” is not allowed.
America is not that far behind BTW.
But Americans are allowed to be more creative which translates to more failures and more successes.
Whereas Chinese and Russian societies refuse to admit to or allow failures, thereby not learning from that incident. America does publish failures and then we fix it as best we can openly.
Americans are viewed as a bunch of unruly kids.
We are just that. Kids by nature are very creative in their play. the “adults” tend to lose that perspective.
So we can succeed where others fear to go.


16 posted on 08/16/2025 12:12:03 PM PDT by rellic (No such thing as a moderate Moslem or Democrat )
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To: rellic

Well said!


17 posted on 08/16/2025 12:26:11 PM PDT by null and void (We are living through the greatest of all ICE Ages.)
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To: catnipman

Nailed it!


18 posted on 08/16/2025 12:49:14 PM PDT by SunkenCiv (NeverTrumpin' -- it's not just for DNC shills anymore -- oh, wait, yeah it is.)
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To: srmanuel

Right, and the cost per launch declines with each reuse. SpaceX’ recycling cost is crazy low. I remember Musk talking about the fairings. There are two of them, and (oddly, IMHO) aren’t hinged off the booster, so they free fall like a shuttlecock back toward the surface. NASA et al would just say, “who gives a ****”, but Musk said, let’s see if we can recover them, that’s $2 million we won’t have to spend again.


19 posted on 08/16/2025 12:52:05 PM PDT by SunkenCiv (NeverTrumpin' -- it's not just for DNC shills anymore -- oh, wait, yeah it is.)
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To: Theophilus

Even if it blows up, it’ll be worth watching. πŸ˜‰


20 posted on 08/16/2025 12:52:30 PM PDT by SunkenCiv (NeverTrumpin' -- it's not just for DNC shills anymore -- oh, wait, yeah it is.)
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