SpaceX Falcon 9 historic landing thread (1st landing attempt & most recent missions)

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I think I remember reading recently that Musk said they were designed to be reused 100 times but realistically they expect to get 15-20 uses from each one.

As long as they monitor their turbopump assemblies and swap engines as necessary. Those along with the nozzle liners are probably the most beat up during operation.

Whatever that remote device is, it looks like it can interface with the booster hold downs. Yay for standardization!
 
As long as they monitor their turbopump assemblies and swap engines as necessary. Those along with the nozzle liners are probably the most beat up during operation.

Whatever that remote device is, it looks like it can interface with the booster hold downs. Yay for standardization!

Those huge launch lugs will get worn down pretty good after a few flights too. I'm sure they're easily replaceable.
 
I think I remember reading recently that Musk said they were designed to be reused 100 times but realistically they expect to get 15-20 uses from each one.

In that April 2016 article that was linked to, Musk also said that the CRS-8 booster #1021 that had just landed would be flying again in 2 months. So, 11.5 months later, it's being relaunched. Musk time-warp/accuracy Reality check.

IIRC from 3-4 years ago, they were hoping to get 10 launches from a booster.

After having successes with returned boosters, and being able to check them out thoroughly, it seems like a lot less than 10. Maybe 5 for a "gently" flown booster that does a full re-entry burn. The ones that have launched very heavy satellites on GTO flights have sacrificed propellant so the re-entry burn is minimal, a "hot" re-entry. IIRC, two of the four they tried have landed safely (two ran out of fuel early & crashed). Musk referred to the first one that survived as having "maximum damage", at least compared to the others. No official statement but it is looking like the ones that survived the "hot" re-entries may never fly again.

And today's is the same profile, a "hot" re-entry. So if it survives, it may never fly again. If they want to rack up a number of re-used flights on one booster, they'll probably use one that never has and never will do a GTO launch profile, so it can have a full reentry burn.

Another thing is that coming up later this year, they will introduce Falcon 9 "Block 5". It will have a few tweaks to the design. One of the most significant being that it will be able to hold up to re-entry better and therefore be able ot be flown more times, and easier to refurbish. Given how few times the current boosters seem to be able to be reused, perhaps , 10 times might be a realistic expectation. At the least if Musk is accurate in predicting 15-20 then it would likely be this Block 5, not the current "1.2 FT Block 4 even though we've never used Block for any Falcon versions before 5"

I'll post some other stuff later. I will say that it is looking like SpaceX is going to also attempt something else totally new on this flight, but don't have time to get into it right now. And I'm not talking about the "Roomba" (unknown if they will be trying that or not).

"Fare thee well" SES-10 mission & hardware.
 
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Launch window opens in a bit over 90 minutes after I post this (6:27 PM EDT)

When I said "Fare thee well', that was a hint.

Bit bigger hint would have been "Fair thee well".

Mega-hint would be "fairings, come home safe"

On his Facebook page, Steve Jurvetson (major investor in SpaceX and Tesla) posted this:

At the historic Apollo 11 Pad 39A for the first reuse of a SpaceX booster (and first attempt at a fairing recovery). Go SpaceX and SES-10, go, go go!
Live webcast for the 3:27pm PST launch window: https://www.spacex.com/webcast

Let's repeat the MAJOR NEW ANNOUNCEMENT part of that: "And first attempt at a fairing recovery"

SpaceX has been planning to recover the fairings for re-use, for long time. The Fairings cost about $3 million total, so well worth developing a system to do it, if practical enough.

Here is a link to an article in 2015 about faring re-use.
https://www.spaceflight101.net/spec...ghts-into-falcon-9-payload-fairing-reuse.html

The article features a video from a GoPro camera onboard a fairing half, showing it slowly tumbling, the video stops before re-entry.

[video=youtube;4_sLTe6-7SE]https://www.youtube.com/watch?v=4_sLTe6-7SE[/video]

Of course, no details on how. Pretty much a given that the fairing halves use some method to stabilize perpendicular to the airflow, if they do not do so naturally. At some point, deploy some kind of parachute. Either conventional round chute, or steerable parafoil. After that..... speculations veer off in many different ways.... like two long ships with a massively huge net stretched across them to catch the fairings as gliding steered parafoils land them precisely. Simple sounding but also unwieldy. Plus how to get the fairing halves out of the net and onto the deck as no way could two ships maintain such extreme precision to do anything beyond traveling a straight line.

Most likely, for a helicopter slowly come in from a bit above, with a cable and hook, snag the chute, then rise up (relative to the chute) to collapse the chute so it won't catch air anymore. That may sound far out but actually not so much. Disagreement over whether a copter could then fly all the way back to the coast, 200 or more miles away, needing to fly slowly due to the drag of the fairing (which would tend to wobble a lot the faster it would fly sideways) and snagged chute. I think if they do it, that they might land the fairings onto a barge or some ship with a very large deck. So the copters could fly back without the fairings.

The image below is a speculative drawing someone made, can't find a bigger version.

17498433_1401672476561448_1732284473096660604_n.jp  g


Whatever they end up doing, it'll be really interesting to see just how, and if it all works out. Even if successful, I doubt they'd be showing this during the live Webcam feed. More likely an announcement first via tweet, and then some video posted sometime later.

I do think it is very likely they have tested this out in some previous missions and had at least one or more deploy the chute and land softly in the ocean (the fabrication is mostly composite, but enough aluminum to render them worthless if they get dipped into salt water. Still, I would have expected they'd have added air-bags to make them float and get one back anyway just to study re-entry effects. None reported to have been SEEN returned and there has been another ship that usually goes out, suspected to be involved with fairing re-use activities). So if they did do such tests and had successful deploys and soft landings, if there had been helicopters out, they could have done the air-snag. But being so experimental, they would not bother with that, just get it to work reliably first.

FWIW - one of several youtube videos about mid-air retrieval of spacecraft or other rocket launch hardware.

[video=youtube;3cnr3pX4tyw]https://www.youtube.com/watch?v=3cnr3pX4tyw[/video]
 
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Is there a site that runs these SpaceX launch videos on demand after the event? I'm not going to be able to watch this one live, but would like to at least see it later.
 
Is there a site that runs these SpaceX launch videos on demand after the event? I'm not going to be able to watch this one live, but would like to at least see it later.

Yeah, just use the same YouTube links. After the flights they will play the full recording.
 
Wow, MADE IT!!!

I had seen a timeline listing the booster landing at 8:32. When it got to be after 8:32 , live video from the ASDS with no indication of a booster landing, I got very concerned. When it went to black at 8:46, I figured that was it....the core had missed and splashed down out of camera view (Had not considered that perhaps the ASDS video had "freeze framed" leading up to landing time, I wasn't looking for wave/barge motion. And indeed on looking at it again it had frozen before the core got close enough to it to indicate it). Then the roar of the crowd, like there was something to cheer for, after a muffled P.A. announcement off-screen that apparently said the booster had landed safely. And then the view of the core safely on deck.

One of those times when watching the hosted webcast is better than the Technical webcast at landing time (I do both, Chromecast one and had the other on my laptop)

Musk Tweet:

Falcon 9 first stage has landed on Of Course I Still Love You — world’s first reflight of an orbital class rocket.

Backing up to a previous post:

Aluminum is used in salt water applications. It requires some attention but it is no deal breaker in this regard.

I wondered for some time, but SpaceX has specifically said the fairings can't be allowed to get wet. So whatever they are doing (hopefully successfully accomplished today), it's supposed to keep them dry.

No news of the fairing recovery yet. Or Roomba if it is being used. Overshadowed by the history of this successful reflight and landing.
 
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Yow! I was leery when both video feeds cut, but it goes to show that it can happen even when the booster isn't crashing to its death...
 
Aluminum is used in salt water applications. It requires some attention but it is no deal breaker in this regard.

Reinhard

Marine grade aluminum alloys are fine in salt water unpainted for years. A short-ish splashdown dip wouldn't hurt it at all if they used the right materials. Now, get some stray current in there and it will get eaten by electrolysis in short order.
 
Lousy timing, but I got to use the feed and recap what I missed. Too bad they have to pointedly say first reuse of an Orbital class rocket since Blue O's stunts.
 
There should be video stored locally on the landing barge. Hopefully we'll be able to see the landing once they've downloaded the captured video. I noticed that the last frame before the landing showed some brightening caused by the rocket. Prior to the landing the video may have been translating at a low rate because the image was very still. When the rocket came in for the landing the video rate probably went up, and the link couldn't handle the higher data rate. That's my guess as to why video was lost just before the landing.
 
There should be video stored locally on the landing barge. Hopefully we'll be able to see the landing once they've downloaded the captured video. I noticed that the last frame before the landing showed some brightening caused by the rocket. Prior to the landing the video may have been translating at a low rate because the image was very still. When the rocket came in for the landing the video rate probably went up, and the link couldn't handle the higher data rate. That's my guess as to why video was lost just before the landing.
The video signal is lost because the vibration from the rocket exhaust causes the satellite uplink to lose lock, at least from the SpaceX explanations. The video rate is limited by the encoder at the barge to stay under the maximum data rate allowed so that should not be the cause.

I do hope they post video of the landing from the barge soon. Pretty historic day for space flight. Science fiction come true.


Tony
 
Elon Musk twittered:
"Musk: The fairing was successfully landed!”

The fairing recovery was a test, trying only one fairing half. It used thrusters to help orient it for re-entry, and deployed a steerable chute. It landed safely in the ocean at a designated location. But they do need to keep the fairings dry, otherwise they are ruined for reuse purposes (I know what a couple of guys have said, but SpaceX insists they can't get dunked into seawater). They will work on the "keeping it dry" part as the fairing recovery project continues.

Obviously for such a project of recovering a fairing, they’d not try to do it all in one test. But it was seeming as though they may have already done such tests secretly on previous flights and today was sounding like the first actual attempt to do full “dry” recovery of both halves. But rather it was step one.... or maybe they did try some before (like the thruster system without chute to test for orientation and re-entry?) but this may have been the first all-out test of the system

Just after 12 minutes into this post-flight press conference video, someone walks over and hands Elon Musk a photo of the fairing half that successfully landed, floating in the ocean. Photo has not been posted anywhere (yet). So, Musk announces that and gives some details.

https://youtu.be/jC3LQFpuzqs

As of right now it is not clear if the fairing was actually retrieved to be brought back. A lot assume so, but an article on NASAspacelfiight says:
followed by the first-ever fairing recovery test success (objective met, fairings not actually recovered)

But AFAIK nobody has posted any news as to the fairing NOT being recovered (or any news that is HAS, either). The photo was apparently of it floating in the water an hour after landing, presumably taken from a recovery ship. No news of it sinking after the photo was taken or any reason why it would not have been recoverable, so that part of their report is puzzling.

If they did retrieve it to bring back, even if ruined for flying again, they can study the effects of re-entry, and the video camera(s) it must have had running all the way. Of course possibly they could have had live video onboard too, with only a select few watching it. As indeed if it failed.... they would have wanted to see what happened via live video since a crash landing would have probably meant no cameras to recover in less they took provisions for the cameras to float and release themselves from the fairing
 
Maybe the fairings can't be reused if they impact the water because of impact damage to the laminate. I would think that would be a solvable problem, though.
 
Unfortunately, the fairing half seems to have sunk or otherwise not recovered.

Musk made a news conference reference to adding a "bouncy house" for a fairing half to land on. So they may be going for a very large airbag floating on the ocean rather than a helicopter air-snag.
 
Unfortunately, the fairing half seems to have sunk or otherwise not recovered.

Musk made a news conference reference to adding a "bouncy house" for a fairing half to land on. So they may be going for a very large airbag floating on the ocean rather than a helicopter air-snag.

I was about to say something about that. SpaceflightNow included this:

He said the fairing recovery plan is “looking quite promising” after several years to experimenting with the technique.

“What we’ll have is kind of like a bouncy castle for it to land on, and we aim to reuse the fairing as well,” Musk said.

“The only thing left is the upper stage, which we originally didn’t intend for the Falcon 9 to have a reusable upper stage, but it might be fun to try a ‘Hail Mary.'”

The full article is here: https://spaceflightnow.com/2017/03/...-in-historic-test-of-cost-cutting-technology/
 
Uh, guys...

So they replaced the barge deck plates (presumably with stronger ones)

And they made this rocket-holder-Roomba thingy (presumably to hold the rocket firmly)

And no one really knows what they intend to do. Here's my guess:

They're gonna grab it with the Roomba, swing the Falcons' own legs back up into flight position, re-center on the new deck plates as/if needed, re-fuel it and fly it back to Florida.
 
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