Author Topic: SpaceX F9 : Starlink v1.0 L21 : KSC LC-39A : 14 March 2021 (10:01 UTC)  (Read 44069 times)

Online Robotbeat

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It either isn't ITAR violating or it was *always* ITAR-violating as "adversaries" have easy access to better radio equipment than amateurs.
Chris  Whoever loves correction loves knowledge, but he who hates reproof is stupid.

To the maximum extent practicable, the Federal Government shall plan missions to accommodate the space transportation services capabilities of United States commercial providers. US law http://goo.gl/YZYNt0

Offline Comga

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...
Considering the assymetrical pooling, this is propable during the yeet-maneuver in which the stage is spinning head over heels, and thus not in 0g.

That would make sense, except you can see from the exterior shots (either those in which the Earth is visible, or those where you can see non-moving shadows on the Merlin) that it is not yet in its flat spin.

So I guess it must be surface tension, but I'm surprised there aren't some LOX globules floating about.

Perhaps the second stage is venting slightly off axis and generating a fraction of a milli-gee but not torque and rotation.
edit: venting as in ulage before a deorbit burn. It appears to be serving that purpose.
« Last Edit: 03/17/2021 03:16 am by Comga »
What kind of wastrels would dump a perfectly good booster in the ocean after just one use?

Online ulm_atms

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https://twitter.com/r2x0t/status/1371054115875348480

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Freshly received #SpaceX #Falcon9 video, enjoy these incredible shots!

Thanks goes to @uhf_satcom for receiving this signal. We will be listening on 2nd orbit as well.

Wow....they don't leave much margin do they?  :o  That's what...a few seconds from the depletion sensor being triggered?  I've seen LOX tank pics but not with the bottom center baffle uncovered....

Offline edkyle99

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https://twitter.com/r2x0t/status/1371054115875348480

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Freshly received #SpaceX #Falcon9 video, enjoy these incredible shots!

Thanks goes to @uhf_satcom for receiving this signal. We will be listening on 2nd orbit as well.

Wow....they don't leave much margin do they?  :o  That's what...a few seconds from the depletion sensor being triggered?  I've seen LOX tank pics but not with the bottom center baffle uncovered....
At this point in the life of the v1.2 Falcon 9, they don't need a lot of margin.  They have a lot of flight data that builds confidence.  They can cut residuals to the bone.  They only need one second of Vacuum Merlin restart for Starlink, plus a bit for deorbit.  They obviously cut it very close for deorbit because there have been a couple of stages that failed to deorbit as planned.  At any rate, there's a sump that is full of LOX here probably, plus the piping, which itself holds quite a bit.

 - Ed Kyle
« Last Edit: 03/15/2021 02:49 pm by edkyle99 »

Offline FutureSpaceTourist

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https://twitter.com/spacexfleet/status/1371258068617543680

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B1051-9 has been secured and OCISLY droneship is en-route to Port Canaveral, following this morning's launch. ETA Tue/Wed (Subject to change)

GO Searcher and Navigator are also underway after completing fairing recovery ops.

Offline CorvusCorax

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Difference between an empty LOX tank and a "really empty" LOX tank ;) (with some floating drops)
If I understand correctly this was 2nd pass, so after payload sep

screenshot attached

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https://twitter.com/r2x0t/status/1371086899645968386

« Last Edit: 03/15/2021 12:49 am by CorvusCorax »

Offline Jansen

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B1051-9 has been secured and OCISLY droneship is en-route to Port Canaveral, following this morning's launch. ETA Tue/Wed (Subject to change)

Thatís really fast! Usually it takes a day to secure the booster and get underway.

Offline FutureSpaceTourist

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It either isn't ITAR violating or it was *always* ITAR-violating as "adversaries" have easy access to better radio equipment than amateurs.

I think it must be the former, as SpaceX have shown live tank shots multiple times. If they hadnít I wouldnít have been comfortable posting it here.
(Contrary to appearances, I donít post everything I see on-line!  :) )

Offline su27k

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Unexpected 'parabola of light' over NC this morning was SpaceX satellite launch

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People across the Triangle were surprised by an unexpected phenomenon in the skies over NC on Sunday morning.

Phone calls, pictures and videos poured in from WRAL viewers, as people sent images of a large parabola of light moving across the skies around 6:10 a.m.

Some called it space debris. Others referred to it as a meteor. Still others reported "possible aliens."

« Last Edit: 03/15/2021 02:14 am by su27k »

Offline Steven Pietrobon

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Here's a better screen grab of the LOX tank.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline OneSpeed

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It would be interesting to see the difference between two flights of the same booster, perhaps L16 and L21 (both booster 1051).

It's a little hard to read with all the noise in the acceleration values, but here are the B1051 boost phase plots for L3, L16 and L21.
« Last Edit: 03/15/2021 09:54 am by OneSpeed »

Offline Citabria

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It's a little hard to read with all the noise in the acceleration values, but here are the B1051 boost phase plots for L3, L16 and L21.

Have you tried smoothing the acceleration values? Or differentiating over a longer delta-time to reduce noise?

I don't know how you are calculating acceleration but, for example, instead of An = (Vn - Vn-1) / (Tn - Tn-1) you could use (Vn+1 - Vn-1) / (Tn+1 - Tn-1) or (Vn+2 - Vn-2) / (Tn+2 - Tn-2) or such. There are even more sophisticated FIR differentiating filters which use various coefficients in summing Ci * Vn+i for several values of i.
« Last Edit: 03/15/2021 05:43 pm by Citabria »

Offline FutureSpaceTourist

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Offline FutureSpaceTourist

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https://twitter.com/spacexfleet/status/1371604368701669380

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SpaceX recovery fleet status as of March 15th!

Expecting lots of arrivals tomorrow. GO Searcher/Navigator are due after 6:30am ET with the fairing.

OCISLY and B1051-9 are due after 11am ET (Likely mid-afternoon)

Support my work: ko-fi.com/spacexfleet

Offline FutureSpaceTourist

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GO Searcher has returned one fairing half. There were some Fleetcam issues, so hereís a distant shot

Offline Jansen

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Offline FutureSpaceTourist

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https://twitter.com/kyle_m_photo/status/1371915561500880898

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B1051.9 can be seen on the horizon. #SpaceXFleet #SpaceX


Offline FutureSpaceTourist

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« Last Edit: 03/17/2021 12:18 am by FutureSpaceTourist »

Offline FutureSpaceTourist

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twitter.com/gregscott_photo/status/1372243211608072192

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A NEW RECORD: 2 boosters (1051-9 & 1058.6), 1 droneship OCISLY, 1 Fairing half, 2 practice Dragon Capsules, 2 fairing ships (Chief & Tree) & Go Quest all together for 1 port shot I got today from above. Its never happened before & maybe never happen again. #SpaceX #NASA @elonmusk

https://twitter.com/gregscott_photo/status/1372243657789739012

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A few more pics from this mornings helicopter ride.

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