Author Topic: SpaceX F9: Starlink v1 Flight 1 : November 11, 2019 - DISCUSSION  (Read 76435 times)

Online old_geez

  • Member
  • Posts: 60
  • Narangba
  • Liked: 60
  • Likes Given: 0
Does anyone have a mass to orbit vs mass expended vs mass recovered ration for this mission?

Offline niwax

  • Full Member
  • ****
  • Posts: 1428
  • Germany
    • SpaceX Booster List
  • Liked: 2045
  • Likes Given: 166
Does anyone have a mass to orbit vs mass expended vs mass recovered ration for this mission?

My estimation:
Total launch mass: 579.4t

of which

Fuel: 530.2t
Payload: 15.6t

Reused: 29.1t
New: 4.5t

Recovered: 27.2t
Expended: 6.4t

Assuming they don't retrieve the fairings.
Which booster has the most soot? SpaceX booster launch history! (discussion)

Offline exilon

  • Member
  • Posts: 61
  • Liked: 163
  • Likes Given: 22
There's something quite satisfying about the authoritative engine gimbal to straighten the booster right before touchdown. 

Offline edzieba

  • Virtual Realist
  • Senior Member
  • *****
  • Posts: 6505
  • United Kingdom
  • Liked: 9942
  • Likes Given: 43
Both the (looking down at the plume) and the (compare rocket body angle to plume trail angle. Ignore the 'glow' portion, look at the longer gas trail) show the stage ending the burn at an extremely jaunty angle.

Offline ugordan

  • Senior Member
  • *****
  • Posts: 8560
    • My mainly Cassini image gallery
  • Liked: 3628
  • Likes Given: 775
Both the webcast (looking down at the plume) and the USLR tracking cam (compare rocket body angle to plume trail angle. Ignore the 'glow' portion, look at the longer gas trail) show the stage ending the burn at an extremely jaunty angle.

Nothing really out of the ordinary for F9 nor, for that matter, other rockets.

Offline vanoord

  • Full Member
  • ****
  • Posts: 695
  • Liked: 451
  • Likes Given: 108
2. There were several landings throughout 2016 and 2017 which didn't have an Octagrabber but the booster never fell over in those landings. Heck even Iridium-7 with one of the harshest seas on landing, had no Octagrabber but returned fine and that booster flew again for the fourth time today.

Excluding this launch, there have been 25 successful ASDS landings with the Octagrabber used 11 times - so 14 times that it hasn't been used (7 on each droneship).

Offline Zed_Noir

  • Senior Member
  • *****
  • Posts: 5490
  • Canada
  • Liked: 1811
  • Likes Given: 1302
Is there any update from SpaceX about fishing the payload fairing halves out of the water like the fairings' previous flight on the Arabsat-6A mission?

Offline scr00chy

  • Full Member
  • ****
  • Posts: 1196
  • Czechia
    • ElonX.net
  • Liked: 1694
  • Likes Given: 1690
Is there any update from SpaceX about fishing the payload fairing halves out of the water like the fairings' previous flight on the Arabsat-6A mission?
Both ships were recalled to port hours before the launch so there was no way to fish the fairings out. SpaceX saying they'd try was some kind of miscommunication, I guess.

Offline Danderman

  • Extreme Veteran
  • Senior Member
  • *****
  • Posts: 10300
  • Liked: 706
  • Likes Given: 727
These satellites were injected into a 280 km parking orbit, compared to 350 km for the previous mission, or is my memory failing me?

The slightly lower injection orbit might account for additional payload capability.

Offline erv

And also less time to decay for [potentially] malfunctioning ones and less interference with other LEO stuff.

Offline Lars-J

  • Senior Member
  • *****
  • Posts: 6809
  • California
  • Liked: 8487
  • Likes Given: 5385
Both the webcast (looking down at the plume) and the USLR tracking cam (compare rocket body angle to plume trail angle. Ignore the 'glow' portion, look at the longer gas trail) show the stage ending the burn at an extremely jaunty angle.

This is normal, F9 usually flies at a slight angle of attack on purpose near the end of the stage 1 flight, presumably to take advantage of some slight aerodynamic lift.

Offline ugordan

  • Senior Member
  • *****
  • Posts: 8560
    • My mainly Cassini image gallery
  • Liked: 3628
  • Likes Given: 775
Both the webcast (looking down at the plume) and the USLR tracking cam (compare rocket body angle to plume trail angle. Ignore the 'glow' portion, look at the longer gas trail) show the stage ending the burn at an extremely jaunty angle.

This is normal, F9 usually flies at a slight angle of attack on purpose near the end of the stage 1 flight, presumably to take advantage of some slight aerodynamic lift.

There's no useful aerodynamic lift at that point, it's purely for trajectory optimizing purposes.

Offline sevenperforce

  • Full Member
  • ****
  • Posts: 1474
  • Liked: 969
  • Likes Given: 599
Both the webcast (looking down at the plume) and the USLR tracking cam (compare rocket body angle to plume trail angle. Ignore the 'glow' portion, look at the longer gas trail) show the stage ending the burn at an extremely jaunty angle.

This is normal, F9 usually flies at a slight angle of attack on purpose near the end of the stage 1 flight, presumably to take advantage of some slight aerodynamic lift.
Residual from the powered change to the landing spot. The stage has to translate over to land on the surface.

Online ZachS09

  • Space Savant
  • Senior Member
  • *****
  • Posts: 8496
  • Roanoke, TX
  • Liked: 2416
  • Likes Given: 2104
Have there been any TLEs recorded for the Starlink sats?
Liftoff for St. Jude's! Go Dragon, Go Falcon, Godspeed Inspiration4!

Offline rsdavis9

Have there been any TLEs recorded for the Starlink sats?

From heavens above

1 70003U 19999A   19315.62222222  .00000000  00000-0  00000-0 0    09
2 70003 053.0000 171.4040 0001502 047.3044 323.7123 15.97988880    01

Maybe newer ones on other sites.
With ELV best efficiency was the paradigm. The new paradigm is reusable, good enough, and commonality of design.
Same engines. Design once. Same vehicle. Design once. Reusable. Build once.

Offline abaddon

  • Senior Member
  • *****
  • Posts: 3176
  • Liked: 4167
  • Likes Given: 5622
There's no useful aerodynamic lift at that point, it's purely for trajectory optimizing purposes.
Then why not just point in the direction you want to go?

Offline gongora

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 10438
  • US
  • Liked: 14355
  • Likes Given: 6148
Have there been any TLEs recorded for the Starlink sats?

From heavens above

1 70003U 19999A   19315.62222222  .00000000  00000-0  00000-0 0    09
2 70003 053.0000 171.4040 0001502 047.3044 323.7123 15.97988880    01

Maybe newer ones on other sites.

The stuff on Heavens Above is a pre-launch guess (although it works pretty good).

Offline AC in NC

  • Senior Member
  • *****
  • Posts: 2484
  • Raleigh NC
  • Liked: 3630
  • Likes Given: 1950
There's no useful aerodynamic lift at that point, it's purely for trajectory optimizing purposes.
Then why not just point in the direction you want to go?

Trajectory optimization is "the direction you want to go".

Offline ugordan

  • Senior Member
  • *****
  • Posts: 8560
    • My mainly Cassini image gallery
  • Liked: 3628
  • Likes Given: 775
Both the webcast (looking down at the plume) and the USLR tracking cam (compare rocket body angle to plume trail angle. Ignore the 'glow' portion, look at the longer gas trail) show the stage ending the burn at an extremely jaunty angle.

This is normal, F9 usually flies at a slight angle of attack on purpose near the end of the stage 1 flight, presumably to take advantage of some slight aerodynamic lift.
Residual from the powered change to the landing spot. The stage has to translate over to land on the surface.

Huh. I assume that's the same reason for example this Delta II can be seen flying at a significant AoA at 0:56 in the video?


Offline envy887

  • Senior Member
  • *****
  • Posts: 8166
  • Liked: 6836
  • Likes Given: 2972
There's no useful aerodynamic lift at that point, it's purely for trajectory optimizing purposes.
Then why not just point in the direction you want to go?

The nice thing about being outside the sensible atmosphere is that you can point your thrust in the direction you want to go, but you can point the rocket itself in other directions.

For instance, if you want to thrust purely horizontally without gravity pulling the nose of the rocket down below the horizon, you point the thrust horizontal and the nose slightly up, offsetting the thrust vector from the CG by the exact amount that gravity is pulling down on the CG. This eliminates gravity losses for that part of the trajectory, since all the the thrust is going to horizontal acceleration and none of ti is fighting gravity directly.

Tags:
 

Advertisement NovaTech
Advertisement Northrop Grumman
Advertisement
Advertisement Margaritaville Beach Resort South Padre Island
Advertisement Brady Kenniston
Advertisement NextSpaceflight
Advertisement Nathan Barker Photography
1