Author Topic: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3  (Read 718432 times)

Offline thor1872

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #340 on: 04/02/2016 07:26 PM »
Its been a week since we've had any images other than the grainy ones from the port cam.  I'm withering away for lack of information.  Someone please feed us.
https://www.reddit.com/r/spacex/comments/4d2slo/close_up_of_the_spacex_asds_of_course_i_still/
Source: https://twitter.com/Restrantek/status/716303900828164096

Direct link
Picture 1 : https://pbs.twimg.com/media/CfDSmd7WAAA0qiV.jpg:orig
Picture 2 : https://pbs.twimg.com/media/CfDR_XeWQAA985_.jpg:orig
« Last Edit: 04/03/2016 07:49 PM by thor1872 »

Offline thor1872

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Offline Kabloona

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #342 on: 04/02/2016 07:59 PM »
Hole looks like it's been completely covered; good progress.

Offline John Alan

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #343 on: 04/02/2016 08:09 PM »
OCISLY From a Helicopter : http://imgur.com/42k1kjY
Source : https://www.reddit.com/r/spacex/comments/4d2wk4/ocisly_from_a_helicopter/

Hole is patched... Looks like a test run of the upper left (nearest to hole) thruster was in progress even...
All thrusters look to be down in fact... A bit of paint and she looks ready to go...  8)

On edit... also looks like re-ballasting is ongoing...  :)
« Last Edit: 04/02/2016 08:22 PM by John Alan »

Online meekGee

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #344 on: 04/02/2016 08:36 PM »
The scar will add character....

Awesome pic
ABCD - Always Be Counting Down

Offline dorkmo

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #345 on: 04/03/2016 03:33 AM »
(falcon) chicks dig scars

Offline dorkmo

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #346 on: 04/03/2016 03:36 AM »
OCISLY From a Helicopter

"drones are outlawed? fine, we'll get a chopper"

lololol


Offline IntoTheVoid

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #348 on: 04/04/2016 03:56 AM »
From a document posted (in a western niche of) the Eastern Range topic...

Takes of Marine Mammals Incidental to Specified Activities; Taking Marine Mammals Incidental to Boost-Backs and Landings of Rockets at Vandenberg Air Force Base
https://www.federalregister.gov/articles/2016/03/31/2016-07191/takes-of-marine-mammals-incidental-to-specified-activities-taking-marine-mammals-incidental-to

Quote
In the event that a contingency landing action is required, SpaceX has considered the likelihood of the First Stage missing the barge and landing instead in the Pacific Ocean, and has determined that the likelihood of such an event is so unlikely as to be considered discountable. This is supported by three previous attempts by SpaceX at Falcon 9 First Stage barge landings, none of which have missed the barge.
« Last Edit: 04/04/2016 05:34 AM by IntoTheVoid »

Offline Kabloona

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #349 on: 04/04/2016 08:38 AM »
IMO, this is the most interesting bit from that document:

Quote
In the event of an unsuccessful barge landing, the First Stage would explode upon impact with the barge; the explosion would not be expected to result in take of marine mammals, as described below. The explosive equivalence with maximum fuel and oxidizer is 503 pounds of trinitrotoluene (TNT) which is capable of a maximum projectile range of 384 m (1,250 ft) from the point of impact. Approximately 25 pieces of debris are expected to remain floating in the water and expected to impact less than 0.46 km2 (114 acres), and the majority of debris would be recovered. All other debris is expected to sink. These 25 pieces of debris are primarily made of Carbon Over Pressure Vessels (COPVs), the LOX fill line, and carbon fiber constructed legs. During previous landing attempts in other locations, SpaceX has performed successful debris recovery. All of the recovered debris would be transported back to Long Beach Harbor for proper disposal. Most of the fuel (estimated 50-150 gallons) is expected to be released onto the barge deck at the location of impact.

So stage explosion = 500 lb bomb, more or less.
« Last Edit: 04/04/2016 08:59 AM by Kabloona »

Offline Zed_Noir

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #350 on: 04/04/2016 09:35 AM »
IMO, this is the most interesting bit from that document:

Quote
In the event of an unsuccessful barge landing, the First Stage would explode upon impact with the barge; the explosion would not be expected to result in take of marine mammals, as described below. The explosive equivalence with maximum fuel and oxidizer is 503 pounds of trinitrotoluene (TNT) which is capable of a maximum projectile range of 384 m (1,250 ft) from the point of impact. Approximately 25 pieces of debris are expected to remain floating in the water and expected to impact less than 0.46 km2 (114 acres), and the majority of debris would be recovered. All other debris is expected to sink. These 25 pieces of debris are primarily made of Carbon Over Pressure Vessels (COPVs), the LOX fill line, and carbon fiber constructed legs. During previous landing attempts in other locations, SpaceX has performed successful debris recovery. All of the recovered debris would be transported back to Long Beach Harbor for proper disposal. Most of the fuel (estimated 50-150 gallons) is expected to be released onto the barge deck at the location of impact.

So stage explosion = 500 lb bomb, more or less.

No. More like a 1500 lb bomb since only a minor fraction of a bomb's mass is the explosive filler.

Offline OxCartMark

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #351 on: 04/04/2016 02:23 PM »
No. More like a 1500 lb bomb since only a minor fraction of a bomb's mass is the explosive filler.

No.

Offline John Alan

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #352 on: 04/04/2016 03:33 PM »
https://en.wikipedia.org/wiki/Mark_83_bomb

1000lb US bomb contains 445lbs of explosive... see link above as source...  :o

And now back to your regularly scheduled barge stalking type discussion...  ;)

Online speedevil

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #353 on: 04/04/2016 03:41 PM »
IMO, this is the most interesting bit from that document:
<snip>
So stage explosion = 500 lb bomb, more or less.
This is assuming all of the oxidiser and fuel mix perfectly.
This is not going to happen.

Offline Jim

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #354 on: 04/04/2016 03:43 PM »
IMO, this is the most interesting bit from that document:
<snip>
So stage explosion = 500 lb bomb, more or less.
This is assuming all of the oxidiser and fuel mix perfectly.
This is not going to happen.


The oxidizer left in the tanks doesn't matter, it is exploding at sea level where there is abundant O2 available.

Offline Kabloona

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #355 on: 04/04/2016 03:50 PM »
In any case, it's pretty clear that the blast is mostly dispersed into the atmosphere and not absorbed by the barge, unlike a direct hit from a bomb.

The only crater produced so far was probably from kinetic energy of the stage impact at high speed, not the propellants going bang...or kaboom, as Elon likes to say.

Offline llanitedave

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #356 on: 04/04/2016 06:07 PM »
IMO, this is the most interesting bit from that document:
<snip>
So stage explosion = 500 lb bomb, more or less.
This is assuming all of the oxidiser and fuel mix perfectly.
This is not going to happen.


The oxidizer left in the tanks doesn't matter, it is exploding at sea level where there is abundant O2 available.


If it's just burning atmospheric oxygen, then the explosion is less likely to be a detonation and more of a deflagration.  SpaceX specifically mentioned oxidizer in its report, so it stands to reason that the maximum energy blast would incorporate the remaining oxidizer contents.
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Offline Kabloona

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #357 on: 04/04/2016 06:39 PM »
Speaking of booms and marine mammals, let's pause for a moment to remember the poor seal who was subjected to the Government-mandated sonic boom experiment via headphones to see if it would interfere with his (her?) libido.

https://mobile.twitter.com/TalulahRiley/status/320422298618302464

And Elon's hilarious comment:

https://pbs.twimg.com/media/BHJd3GQCAAA5uqa.png

Can't make this stuff up. The good news is, thanks to the seal's noble sacrifice, SpaceX is on the way to obtaining permission for one year of RTLS attempts at VAFB.

Now back to regular ASDS programming...
« Last Edit: 04/04/2016 06:55 PM by Kabloona »

Online MattMason

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #358 on: 04/04/2016 06:52 PM »
Speaking of booms and marine mammals, let's pause for a moment to remember the poor seal who was subjected to the Government-mandated sonic boom experiment via headphones to see if it would interfere with his (her?) libido.

https://mobile.twitter.com/TalulahRiley/status/320422298618302464

And Elon's hilarious comment:

https://pbs.twimg.com/media/BHJd3GQCAAA5uqa.png

Can't make this stuff up. The good news is, thanks to the seal's noble sacrifice, SpaceX has been granted permission for one year of RTLS attempts at VAFB.

Now back to regular ASDS programming...

Made all the more humorous when you realize Talulah Riley was/is Mrs. Elon Musk. (You saw her briefly in the film "Inception").
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Offline starhawk92

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Re: SpaceX's Autonomous Spaceport Drone Ship Discussion Thread 3
« Reply #359 on: 04/04/2016 08:02 PM »
Anyone want to estimate the time remaining for fixes and repairs to be on station and ready for a Friday launch?

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