Author Topic: SpaceX Falcon 9 : Hispasat 30W-6 (1F) : March 6, 2018 - DISCUSSION  (Read 161356 times)

Offline deruch

  • Senior Member
  • *****
  • Posts: 2422
  • California
  • Liked: 2006
  • Likes Given: 5634
From falcon payload document.


Just to be clear, that (spin about the X-axis) wasn't the type of rotation imparted to this satellite.

I may have been misremembering - but I thought it was.
The cameras that are pointed not along the axis of the stage show it rotating confusingly, but the payload deploy makes it clear - the satellite is departing along the spin axis, which makes the spin axis the X axis.

In the F9 coordinate frame, the X-axis is along the length of the rocket (positive towards the nose end).  So, thinking of it as an airplane, spinning about the x-axis would be the equivalent of an aileron roll. 
Shouldn't reality posts be in "Advanced concepts"?  --Nomadd

Offline cscott

  • Senior Member
  • *****
  • Posts: 3471
  • Liked: 2867
  • Likes Given: 726
Ride-share confirmed.

What are the approvals required for such a ride-share?
Is it just 'get the approval of your host'?

Do these satellites have to be separately approved, or are they buried in the not-revealed applications paperwork, and only the main satellite reported publically?
See https://spectrum.ieee.org/tech-talk/aerospace/satellites/fcc-accuses-stealthy-startup-of-launching-rogue-satellites.amp.html for some of the difficulties licensing ride shares.

In this case my interpretation was that the rideshare contracted with the customer, not with SpaceX, so it was up to the customer to publicize (or not).  The PODSat was still attached to HispaSat when last we saw them on the SpaceX webcast drifting away.

This would differ from the (usual?) case where SpaceX was the matchmaker for several different customers, or where the customer is primarily a cubesat integrator.
« Last Edit: 03/10/2018 09:00 pm by cscott »

Offline schaban

  • Full Member
  • *
  • Posts: 180
  • Liked: 53
  • Likes Given: 132
So does it mean that total weight (with ride shares) was indeed the biggest to gto?

So does it mean that total weight (with ride shares) was indeed the biggest to gto?

Apparently not.

Quote
Jonathan McDowell

@planet4589

If it is a 4-HiSat satlet cluster as per the paper by @NovaWurks the mass of PODSAT is probably only 50 kg or so, with maybe a further 50 kg at most for the attachment hardware on Hispasast. So I don't see how it matches IS-35e

https://twitter.com/planet4589/status/972165349222289409

Offline Zed_Noir

  • Senior Member
  • *****
  • Posts: 5490
  • Canada
  • Liked: 1809
  • Likes Given: 1302
Does anyone know if Hispasat 30W-6 (1F) is the biggest comsat that SpaceX have put in a GTO orbit? Not the comsat's mass, but the physical dimensions with the solar arrays deployed.




Offline cscott

  • Senior Member
  • *****
  • Posts: 3471
  • Liked: 2867
  • Likes Given: 726
I think conventional wisdom of what Elon meant by "biggest" was some physical dimension, not mass.  There are lots of possibilties---volume, solar wingspan, length, diameter, etc---I don't know that we'll know which he meant unless he says so himself (or maybe if Gwynne is asked). Or he misspoke; that's also possible, but I think unlikely given how often the factoid was repeated.

Online ChrisC

  • Veteran
  • Senior Member
  • *****
  • Posts: 2216
  • Liked: 1561
  • Likes Given: 1749
SSL PODS user's guide (revision 1, 2017):  https://www.sslmda.com/pods/pods_users_guide.pdf  (direct .pdf link)

Also attached for posterity.

I (virtually) know the guy that wrote that manual!  He was surprised that this is now public.
« Last Edit: 03/12/2018 12:20 am by ChrisC »
PSA #1: EST does NOT mean "Eastern Time".  Use "Eastern" or "ET" instead, all year round, and avoid this common error.  Google "EST vs EDT".
PSA #2: It's and its: know the difference and quietly impress grammar pedants.  Google "angry flower its" .  *** See profile for two more NSF forum tips. ***

Online gongora

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 10205
  • US
  • Liked: 13885
  • Likes Given: 5933
Ride-share confirmed.

What are the approvals required for such a ride-share?
Is it just 'get the approval of your host'?

Do these satellites have to be separately approved, or are they buried in the not-revealed applications paperwork, and only the main satellite reported publically?

The ride-sharing sat would need the standard approvals for a satellite and should have its own paperwork.  Commercial sats should be reported publicly but this one was apparently from the military.

Offline groknull

  • Full Member
  • **
  • Posts: 227
  • U.S. West Coast
  • Liked: 431
  • Likes Given: 1013
From UPDATES...

Hmmm... not raising perigee first

43228   HISPASAT 30W-6   2018-023A      636.73min    27.04deg   35961km   317km

Combined perigee raise, inclination change likely more efficient at final apogee.

Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 39218
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 32738
  • Likes Given: 8196
Hmmm... not raising perigee first

As long as the perigee is not too low (to avoid flying through the atmosphere), for a sub-synchronous GTO you want to raise the apogee first. You can then do a combined (and efficient) perigee raise and inclination change at apogee.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online gongora

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 10205
  • US
  • Liked: 13885
  • Likes Given: 5933
SSL ACCELERATES INNOVATION WITH ADVANCED DESIGNS AND 3D PRINTING
Quote
The Hispasat 30W-6 antenna tower is the largest and most complex antenna support structure that SSL has completed to date.

The strut-truss design methodology used on the satellite, which brings a range of communications services to Europe, the Americas, and North Africa contains more than 200 carbon fiber composite struts, making it three times the size of the first strut-truss tower that SSL launched in late 2016. More than 200 additively manufactured metal and polymer components were incorporated throughout Hispasat 30W-6 including 3D printed nodes that enabled the antenna tower design.

Online gongora

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 10205
  • US
  • Liked: 13885
  • Likes Given: 5933

Tags: Lessons 
 

Advertisement NovaTech
Advertisement Northrop Grumman
Advertisement
Advertisement Margaritaville Beach Resort South Padre Island
Advertisement Brady Kenniston
Advertisement NextSpaceflight
Advertisement Nathan Barker Photography
0