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Official Space Exploration Coolness Thread
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turtle
Lord of the Rant.
Formerly turtle2472
 
Join Date: Mar 2005
Location: Upstate South Carolina
 
2020-07-01, 13:08

I know. It is amazing how far we have come that they can even design it to operate that way. Thanks for sharing PKIDelirium!
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Quagmire
meh
 
Join Date: May 2004
 
2020-07-02, 13:54

Quote:
Originally Posted by PKIDelirium View Post
They lost a couple flown-several-times-already boosters on Starlink missions earlier in the year, but Starlink was a trajectory they weren't fully used to, and other factors played into both. One of them lost the center engine from some alcohol used in the between-flight cleaning process had been left in part of the system, and without the center engine you can't steer correctly or fire the landing burn. It burned up during entry. The other one had rough seas in the landing area and self-aborted to hit the ocean so the droneship wouldn't be damaged.

By default, the grid fins keep them on a trajectory to deliberately miss the droneship or ground pad until the landing burn starts, so if there's a problem, they just hit the ocean. When the landing burn starts (or fails to start for whatever reason), that's when the booster's guidance computer commits to either correct that and target the pad/ship, or abort into the drink.
As perfectly seen with CRS-16 launch and B1050 taking a bath due to the grid fin malfunction.

Scott Manley explains it well.

https://www.youtube.com/watch?v=EH1nyPIvLjI

giggity
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kscherer
The Ban Hammer
 
Join Date: Aug 2004
Location: Boyzeee
 
2020-07-21, 12:27

And another one. At 23:20 is the best video of the 1st stage recovery landing that I've seen so far. Very well done.

I watched a video somewhere about the timing required for that landing burn. It literally has to be *exact*, because without the fuel and payload, that single Raptor engine will send the first stage right back into the sky unless it shuts down exactly as the landing legs touch down. Any longer and the thing re-launches!

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kieran
Tweeting @kierankelly
 
Join Date: Jan 2005
Location: New York City
 
2020-07-21, 21:49

The fact that these landings on drone ships have become routine still blows my mind.

I remember the first few where it missed, or fell over, etc... and it was so close, yet seemed so far away.

Now? It's basically guarantee that these things are being recovered (when possible)

What a crazy and great time to be back into the space race.
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kscherer
The Ban Hammer
 
Join Date: Aug 2004
Location: Boyzeee
 
2020-07-22, 11:19

No doubt. It will get to the point where a failure will be ?!?

They're getting really good at this.
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PKIDelirium
Nobody bumps my lock
 
Join Date: Oct 2005
Location: Xenia, Ohio
 
2020-07-23, 04:12

There were two failed droneship landings earlier this year, both on Starlink launches. One was the one I used before to describe the safety trajectory for booster landings, which lost the center engine late in ascent, was unable to carry out the entry burn properly and subsequently disintegrated, and the other was similar to CRS-16's landing abort just off the Cape from the ground LZ, which experienced a problem and automatically steered away from the ship during the landing burn, performing a "soft landing" in the ocean. That one, like CRS-16 remained almost entirely intact but was too far offshore to tow back, so they brought in a ship-mounted crane from the Morehead City port (generally the closest port to the landing areas) to scrap it where it was.

Other than that, I don't even remember when the last droneship landing failure was. Two Falcon Heavy center cores missed but those involved the first two flights ever of Falcon Heavy and it was questionable if they'd be able to land them. The third Falcon Heavy center core landed successfully, but unfortunately the "roomba" robot carried on the drone ship to come out and anchor the booster to the deck hadn't yet been fitted to be compatible with Falcon Heavy, and it fell over in rough seas. They made some limited edition souvenirs for employees out of the landing legs and lower engine/fuel line section that was left on the deck after the rest broke off and fell off the platform.

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kscherer
The Ban Hammer
 
Join Date: Aug 2004
Location: Boyzeee
 
2020-07-23, 10:56

Yeah, there will be mishaps, but they are becoming rare.
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Quagmire
meh
 
Join Date: May 2004
 
2020-08-02, 15:13

And DM-2 has come to a close. Dragon has splashed down, recovered onto Go Navigator, hatch opened, and Bob and Doug have come out of Endeavour.


giggity
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PKIDelirium
Nobody bumps my lock
 
Join Date: Oct 2005
Location: Xenia, Ohio
 
2020-08-02, 18:26

They had a bunch of Florida Man fishing boats getting up close too. NASA had apparently only requested one CG cutter for the entire landing zone and one CG helicopter to bring the crew back from the recovery ship after the fact.

Early '09 Mac mini (El Capitan), iPhone 7 (iOS 12.3), iPad Air 2 (iOS 12.3), Mid '10 MacBook Unibody (High Sierra), Mid '05 14" iBook G4 (Tiger)
Kings Island Site, Horribly Outdated Flickr
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Quagmire
meh
 
Join Date: May 2004
 
2020-08-02, 18:44

Quote:
Originally Posted by PKIDelirium View Post
They had a bunch of Florida Man fishing boats getting up close too. NASA had apparently only requested one CG cutter for the entire landing zone and one CG helicopter to bring the crew back from the recovery ship after the fact.
Yep major fail there. But that seems to be the biggest glitch for the whole mission. Just a lack of imagination that wouldn’t happen when they were close to shore.

EDIT: Coast Guard: 12 boats is enough to overwhelm us. https://twitter.com/MilesDoran/statu...087424/photo/1

giggity

Last edited by Quagmire : 2020-08-02 at 20:04.
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Quagmire
meh
 
Join Date: May 2004
 
2020-08-05, 13:55

Last year SpaceX got a water tank to fly. This year a grain silo takes flight.

https://www.youtube.com/watch?v=s1HA9LlFNM0
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kscherer
The Ban Hammer
 
Join Date: Aug 2004
Location: Boyzeee
 
2020-08-05, 15:08

I saw that. Super cool. Looks just funny as hell, but glad they made it happen.

And this while they're launching rockets, like, every twelve seconds!
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PKIDelirium
Nobody bumps my lock
 
Join Date: Oct 2005
Location: Xenia, Ohio
 
2020-08-05, 22:29

And that was with a SINGLE Raptor engine that wasn't attached on the centerline because the engine mount is meant for three, in a tri-config like the Shuttle's main engines were. Just wait until they get to the three-engine high altitude flights...

Early '09 Mac mini (El Capitan), iPhone 7 (iOS 12.3), iPad Air 2 (iOS 12.3), Mid '10 MacBook Unibody (High Sierra), Mid '05 14" iBook G4 (Tiger)
Kings Island Site, Horribly Outdated Flickr
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Quagmire
meh
 
Join Date: May 2004
 
2020-08-05, 22:37

Quote:
Originally Posted by PKIDelirium View Post
And that was with a SINGLE Raptor engine that wasn't attached on the centerline because the engine mount is meant for three, in a tri-config like the Shuttle's main engines were. Just wait until they get to the three-engine high altitude flights...
I’m looking forward to seeing 31 Raptors going with Super Heavy.
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kscherer
The Ban Hammer
 
Join Date: Aug 2004
Location: Boyzeee
 
2020-08-06, 11:42

Quote:
Originally Posted by PKIDelirium View Post
And that was with a SINGLE Raptor engine that wasn't attached on the centerline because the engine mount is meant for three, in a tri-config like the Shuttle's main engines were. Just wait until they get to the three-engine high altitude flights...
Ah! That explains the off-balance crazy. And I thought they were having stabilization issues.

How awesome is that?
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