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#120
by
SMS
on 20 Jan, 2021 21:53
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#121
by
Vettedrmr
on 21 Jan, 2021 01:23
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Regarding the interaction with the relative wind, I thought it odd that the program calls for the rocket to tilt to a set angle, stay like that for a good minute, then abruptly return to centered attitude before MECO. If this were an airplane, the angle of attack would be changing gradually according to the airspeed and thickness of the atmosphere.
You want to zero out the AoA before staging. And we don't know how gradually the AoA changed during the powered phase, we only know how quickly it zeroes out.
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#122
by
OneSpeed
on 21 Jan, 2021 02:04
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Anyone has a good guess what this strange maneuver is for?
The primary objective getting a rocket to orbit is to gain horizontal velocity as quickly as possible. To that end, Falcon 9 often completes its gravity turn quickly, by around T+01:40. From that point on to MECO, it needs to generate some lift to continue to increase the vertical component of its velocity. Increasing the AoA generates not only some aerodynamic lift, but also a vertical thrust component. Attached is plot of the Starlink L16 boost phase, including the vertical velocity component derived from the altitude telemetry. The noise is very high, but you can still see from the fairly constant slope, that the vertical acceleration is maintained right through the boost phase.
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#123
by
Steven Pietrobon
on 21 Jan, 2021 04:08
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What happened to Steve, btw? I really miss his launch coverage.
I'm still alive and kicking! In order that I can spend more time on my other interests, I decided to retire from providing live launch coverage on NSF.
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#124
by
zubenelgenubi
on 21 Jan, 2021 04:37
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What happened to Steve, btw? I really miss his launch coverage.
I'm still alive and kicking! In order that I can spend more time on my other interests, I decided to retire from providing live launch coverage on NSF.
Thank you very much, Steven, for your voluminous efforts providing live coverage over the years here.
Time for the rest of us to pick up the slack!
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#125
by
jacqmans
on 21 Jan, 2021 07:12
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#126
by
ugordan
on 21 Jan, 2021 08:50
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#127
by
FutureSpaceTourist
on 21 Jan, 2021 18:29
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#128
by
FutureSpaceTourist
on 21 Jan, 2021 21:24
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#129
by
FutureSpaceTourist
on 21 Jan, 2021 21:48
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https://twitter.com/spacexfleet/status/1352386952096600068 Empty 😲
Ms. Chief has returned from the Starlink mission without a fairing half, not even a fragment to be seen.
Ms. Tree is still offshore and heading directly to the Transporter-1 LZ. Not clear if Ms. Chief will head back out soon.
As seen by @NASASpaceflight Fleetcam
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#130
by
Jansen
on 22 Jan, 2021 02:36
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#131
by
Jansen
on 23 Jan, 2021 05:38
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#132
by
cscott
on 23 Jan, 2021 14:08
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They showed Ms. Tree at sea during the webcast today for the Transporter-1 scrub. No fairing half to be seen on deck.
Is it possible they lost both fairing halves from this mission? Perhaps sea states were bad enough to lose the halves and damage Ms. Chief enough to require a return to port? Pure speculation.
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#133
by
Rekt1971
on 23 Jan, 2021 14:18
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They showed Ms. Tree at sea during the webcast today for the Transporter-1 scrub. No fairing half to be seen on deck.
Is it possible they lost both fairing halves from this mission? Perhaps sea states were bad enough to lose the halves and damage Ms. Chief enough to require a return to port? Pure speculation.
They showed Ms. Chief, not Ms. Tree.
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#134
by
FutureSpaceTourist
on 23 Jan, 2021 18:52
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#135
by
cscott
on 24 Jan, 2021 03:11
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They showed Ms. Tree at sea during the webcast today for the Transporter-1 scrub. No fairing half to be seen on deck.
Is it possible they lost both fairing halves from this mission? Perhaps sea states were bad enough to lose the halves and damage Ms. Chief enough to require a return to port? Pure speculation.
They showed Ms. Chief, not Ms. Tree.
Oh! We knew Ms. Chief didn't have fairing halves on board. Still possible that Ms. Tree has one or two on deck from the starlink launch, then?
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#136
by
scr00chy
on 24 Jan, 2021 10:59
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They showed Ms. Tree at sea during the webcast today for the Transporter-1 scrub. No fairing half to be seen on deck.
Is it possible they lost both fairing halves from this mission? Perhaps sea states were bad enough to lose the halves and damage Ms. Chief enough to require a return to port? Pure speculation.
They showed Ms. Chief, not Ms. Tree.
Oh! We knew Ms. Chief didn't have fairing halves on board. Still possible that Ms. Tree has one or two on deck from the starlink launch, then?
Correct.
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#137
by
Oersted
on 24 Jan, 2021 14:18
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What happened to Steve, btw? I really miss his launch coverage.
I'm still alive and kicking! In order that I can spend more time on my other interests, I decided to retire from providing live launch coverage on NSF.
Thank you so much, Steven, for your heroic efforts over the years and congratulations on a well-deserved retirement from the intense and stressful world of up-to-the-minute thread updates
- You're leaving some big shoes to fill for your eventual successors once they complete the rigourous NSF selection process and training camp.
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#138
by
FutureSpaceTourist
on 24 Jan, 2021 19:29
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#139
by
FutureSpaceTourist
on 24 Jan, 2021 19:59
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