SpaceX Falcon 9 : Telstar 19 Vantage : July 22, 2018 - DISCUSSION

[catdlr]

Didn't it only lose one half the fairing? 

https://forum.nasaspaceflight.com/index.php?topic=45846.msg1841409#msg1841409

[deruch]

Were  the fairings halves  recovered?

If you mean were they caught by a ship with the net on it?  No.  If the fairings had the recovery hardware installed, they may get picked up from the ocean surface.  But SpaceX doesn't currently have a fairing catching ship on the east coast.  Their only one Mr. Steven, which operates out of Los Angeles and attempts catching fairing halves from launches out of VAFB.  Next attempt will be on the upcoming Iridium 7 launch.

This is an actual headline on CNN:
       SpaceX loses multi million dollar fairing

The headline doesn't mention that the launch and primary mission were successful, nor does it mention that SpaceX landed the first stage in the worst conditions ever.  Nope, the headline is about how SpaceX FAILED to catch the fairing.

Wow, are we disappointed in SpaceX for failing to do something that has NEVER been done by anyone before.

The CNN coverage is about the Iridium-7 launch, not Telstar 19V.  Shouldn't this discussion be in that thread?

[ZachS09]

Will the landing legs on Core B1047 be retracted this time, or will they remove the legs as always?

[ATPTourFan]

I don't think anyone knows for sure, but there are people watching at the Port and providing play by play updates on twitter. See the update thread.

Midday update: booster legs still attached, some venting seen from a nearby truck, and loud venting noises heard, something is happening......

https://mobile.twitter.com/ThAerospaceGeek/status/1022890678571941888
https://mobile.twitter.com/ThAerospaceGeek/status/1022869961021292545

[matthewkantar]

The new truss/cap for lifting the booster looks like it has four small winches located over the legs. Looks like little weights on the cable so they can be lowered to connect to the end of the leg for folding em up.

We will see soon.

[MarekCyzio]

Looks like the legs will be retracted after all:
https://twitter.com/ThAerospaceGeek/status/1022904488611508224?s=20

[Comga]

SpaceX - First Leg Retract - Booster Lift 07-27-2018
USLaunchReport

Leg retract video
Dispite the narrator ‘s conjecture SpaceX is not going to rotate the new cap between leg retracts.
It is 4 way symmetric, as are the legs.
They will use the same two cables to retract the leg opposite the one videoed being retracted.
They will use the other two cables to retract the other two legs that are at 90 degrees to the first two.
( My certainty is based on logic, not insider info.)

[tj]

Looks like first two LAE burns were applied at perigee to raise the apogee.
Launch: 243 km x 17863 km,
After perigee burn 2:  299 km x 23181 km [from info on 25 July]
Still about 27 deg inclination
Probably blind perigee burns
[source: heavens-above.com]

[russianhalo117]

Welp, the raised leg was lowered and all 4 leg pistons have been removed, the leg raising was just a test it appears......

https://mobile.twitter.com/ken_kremer/status/1023610742237552643

or they had issues latching the leg. Remains to be confirmed.

[photonic]

Anyone knows where they needed the liquid nitrogen for? The tank can clearly be seen in the USLaunchReport video and in the pictures up thread.

[fake_name]

Anyone knows where they needed the liquid nitrogen for? The tank can clearly be seen in the USLaunchReport video and in the pictures up thread.

A guess, but likely volume of LIN they wanted on site and availability of assets.

If the demand is withing the range that an atmospheric pressure build coil can be used (low flow rate but for a very long time) with a small high pressure LIN vessel it can be less hassle then using a big high pressure tube trailer.

There is a cutover point where a liquide vessel makes more sense then gas stock.

Edit: to be clear I'm suggesting they are vaporizing the LIN to GAN, not using the LIN directly.

[rsdavis9]

Anyone knows where they needed the liquid nitrogen for? The tank can clearly be seen in the USLaunchReport video and in the pictures up thread.

My guess is to provide gaseous N2 for pressurizing the opposite side of the cylinders to cause the legs to retract themselves.

[envy887]

Anyone knows where they needed the liquid nitrogen for? The tank can clearly be seen in the USLaunchReport video and in the pictures up thread.

My guess is to provide gaseous N2 for pressurizing the opposite side of the cylinders to cause the legs to retract themselves.

SpaceX uses gaseous nitrogen to purge and pressurize the booster itself, the tank of LN2 is almost certainly for that purpose.

The leg struts are probably one-way pneumatic rams. They can open, but not close themselves. That would be why they built the rig to mechanically close the legs.

[rsdavis9]

I guess I am used to tractor and truck hydraulics that always have fittings on both sides of the piston. Is it that much harder to make a piston and cylinder to do both ways?

[envy887]

I guess I am used to tractor and truck hydraulics that always have fittings on both sides of the piston. Is it that much harder to make a piston and cylinder to do both ways?

It adds some mass and complexity, and a double-acting telescoping ram doesn't get as much pull force as it does push force.

However, Pauline Acalin's latest photos show a high pressure line running to where the return port on a double acting telescoping ram should be, as well as holes in subsequent sections that would be needed for full powered retraction of all sections. So perhaps they did set it up for that.

Pneumatic line:
https://cdn.teslarati.com/wp-content/uploads/2018/07/F9-B1048-leg-hardware-pano-Pauline-Acalin-1c.jpg

Vent/retract pressurization holes:
https://cdn.teslarati.com/wp-content/uploads/2018/07/F9-B1048-recovery-details-Pauline-Acalin-11c.jpg

[pb2000]

TELSTAR 19V   2018-059A      1387.88min   0.37deg   35706km   33969km

That was a big burn! Now only ~40m/s left to get to GEO, then moving to it's orbital slot.

I believe I heard something about a temporary slot for testing before moving into it's operational slot.

[Phillipsturtles]

Looks like another problem with a Maxar satellite. Hopefully this and SXM-7 failures aren't caused by the cost cutting Maxar has been doing.
https://twitter.com/pbdes/status/1369601260991700994

"Telesat’s T-19 Vantage satellite has suffered multiple failures of a battery-support component that, if compounded by further failures, could prevent the satellite from full operations during the two eclipse periods, with a combined duration of about three months per year."