Author Topic: SpaceX Falcon 9 : CRS-16 (Dragon SpX-16) : December 5, 2018 - DISCUSSION  (Read 255686 times)

Offline kevinof

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Current is going north at 0.7, wind was going south at 10 kts. Wind caused it to drift south.

So, this shows the rocket under tow. Looks like north instead of south?

At that point I believe it was just anchored in place. What looks like movement is likely the current heading south.
Far as I know the current there is northbound. Either way I think it's just being held in place and not actively towing.

No, it landed off-shore the landing pad, and drifted south towards Port Canaveral where it was at that point.

Offline vanoord

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Wind will probably have more effect on the booster than tide.

Given the damage to the interstage, lifting it out of the water conventionally with a cap would appear to be a no-go.

It should be relatively simple to connect up the large crane to the octaweb to lift most of the weight, but unless they're happy to lift the booster upside down and further damage it when it's put down, presumably a second crane will be required with the booster slung either just under the interstage or at the interbank bulkhead.

Offline Hauerg

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Regardless of any gashes and landing legs being intentionally removed or torn off by Aquaman himself (clearly this whole thing is paid promotion from DC Comics proving water > space):

The stage has been in salt water for nearly 30 hours already and even if it would be out by 9 AM sharp tomorrow morning, 44 hours. Then hydraulics already failed before landing, who knows what caused that, and the whole thing took a sizeable whack when it tipped over into water and spent however many hours it will ultimately be subjected to the constant forces of ocean waves jerking it around, which might or might not have torn any gashes into it.

Add the recovery to it, it's not something that's really been done before so they might as well further damage it even with the best intentions.

All that taken together: Do you think this stage will ever fly again?

The way I see it, even if they successfully recover it, which seems like quite a headache, all value this stage has is forensics, which might be valuable in itself though.
At least some of the grid fins will fly again. (They are expensive as hell.)

Offline vanoord

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At least some of the grid fins will fly again. (They are expensive as hell.)

This recovery effort is worth it just to get the fins back.

As for the rest of it, the damage caused by immersion in sea water can be massively reduced by action taken immediately after recovery - for something like a boat engine, that means strip down, wash down and coat in oil as soon as practically possible. If things are left, even for a couple of days, that's usually enough to finish them off.

Anything electrical will be a write-off straight away. For example, water gets down the inside of wires and that's made worse if there's any current in it when it's immersed: even though wires might look okay, they can fail 6, 12, 18 months later. Not the end of the world if it's a little outboard motor on a boat, but a big problem if it's part of a rocket.

Offline speedevil

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Anything electrical will be a write-off straight away. For example, water gets down the inside of wires and that's made worse if there's any current in it when it's immersed: even though wires might look okay, they can fail 6, 12, 18 months later. Not the end of the world if it's a little outboard motor on a boat, but a big problem if it's part of a rocket.
I would not be surprised to see a nontrivial fraction of the electronics in well sealed boxes, for the purposes nominally of remaining at near STP during flight, and secondary purposes of avoiding sea air ingress in nominal launch and landing.

Offline ugordan

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At least some of the grid fins will fly again. (They are expensive as hell.)

This recovery effort is worth it just to get the fins back.

And the hydraulic pump for a teardown to see why it stalled, unless salt water ingress has washed away (no pun intended) that evidence by now.

Offline JoostNL

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So is there a thread following the berthing operations for Dragon? IIRC there was always a thread for this but I cannot seem to find it.

Offline sghill

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Eagle captain is talking to SpaceX on the radio.

The plan is to bring it into the west basin, then turn it around with two boats.

The webcam-that-shall-not-be-named has a lovely view of the entrance to the port this morning.
Bring the thunder!

Offline rakaydos

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So is there a thread following the berthing operations for Dragon? IIRC there was always a thread for this but I cannot seem to find it.
it's also this thread, but with a long phasing orbit, there's nothing to talk about (yet) on dragon, and lots to talk about on Falcon.

Offline kevinof

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Now if only I could remember the name of that webcam that shall  not be named....

Eagle captain is talking to SpaceX on the radio.

The plan is to bring it into the west basin, then turn it around with two boats.

The webcam-that-shall-not-be-named has a lovely view of the entrance to the port this morning.

Offline Rocket Science

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Looks like a stiff breeze from the north...
"The laws of physics are unforgiving"
~Rob: Physics instructor, Aviator

Offline Wolfram66

Not sure why this is such a difficult problem to solve. SpaceX owns a MARMAC barge, this is designed to do things like this.. Drive lift crane onto OCISLY, dispatch to booster w/ tug, Lift booster on to deck, return to dock, drive crane off OCISLY, deal with booster.....

It's like watching mimes in a box... guys... there IS no box.

There is a similar barge with a crane or excavator currently maintaining the Port Canaveral channel as we speak.... so don't say it can't be done. 

After the last time they soft landed a booster in the water, they should have had a contingency plan in place.
« Last Edit: 12/07/2018 02:03 pm by Wolfram66 »

Offline jpo234

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Now if only I could remember the name of that webcam that shall  not be named....

Eagle captain is talking to SpaceX on the radio.

The plan is to bring it into the west basin, then turn it around with two boats.

The webcam-that-shall-not-be-named has a lovely view of the entrance to the port this morning.

Google is your friend. Search for "port canaveral web cam".
You want to be inspired by things. You want to wake up in the morning and think the future is going to be great. That's what being a spacefaring civilization is all about. It's about believing in the future and believing the future will be better than the past. And I can't think of anything more exciting than being out there among the stars.

Offline sanman

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Why can't they make gridfins electromechanical instead of hydraulic? Wouldn't that improve their reliability?

Offline Rocket Science

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"The laws of physics are unforgiving"
~Rob: Physics instructor, Aviator

Offline edkyle99

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After the last time they soft landed a booster in the water, they should have had a contingency plan in place.
I agree.  The contingency plan should be to tow it out of sea lanes and to provide a means to safely sink it.  This thing is probably costing them more money to salvage than it would cost to pull to deep water and sink.  Or, better yet, modify the software to do a crash landing instead of a soft landing in such instances.

 - Ed Kyle

Offline freda

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At this moment, a view of the booster on the Two Palms webcam. http://twopalms.com

Offline vanoord

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Not sure why this is such a difficult problem to solve. SpaceX owns a MARMAC barge, this is designed to do things like this.. Drive lift crane onto OCISLY, dispatch to booster w/ tug, Lift booster on to deck, return to dock, drive crane off OCISLY, deal with booster.....

It's like watching mimes in a box... guys... there IS no box.

There is a similar barge with a crane or excavator currently maintaining the Port Canaveral channel as we speak.... so don't say it can't be done. 

There's no way of getting any big crane onto OCISLY as the barge has deck extensions which will not take much weight.

It's much simpler to bring the booster into the port and deal with it there.

Offline vanoord

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I agree.  The contingency plan should be to tow it out of sea lanes and to provide a means to safely sink it.  This thing is probably costing them more money to salvage than it would cost to pull to deep water and sink.  Or, better yet, modify the software to do a crash landing instead of a soft landing in such instances.

The grid fins are worth recovering and will more than cover the cost of the salvage operation.

Future contingency plans may well involve sinking the core (after removal of grid fins and perhaps legs) but this time SpaceX have the opportunity to recover a core and assess the effects of 2 days floating to see whether they are worth recovering in future.

Online Steve D

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From looking at the two palms webcam it seems to be under tow right now

Tags: CRS-16 
 

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