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SpaceX's Grasshopper  
User currently offlineZANL188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Posted (2 years 4 months 1 day 1 hour ago) and read 32767 times:
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Another space commercialization idea that may or may not work out is SpaceX's Grasshopper. The idea is to fly a Falcon 9 first stage back to its launch site & reuse it, thereby lowering the cost of getting to orbit.

Recently SpaceX had another successful test of the Grasshopper, flying the 12 story tall vehicle to a height of approximately 12 stories and then landing. Amazing thing to me here, vs other similiar vehicles, is the sheer size of the thing... It's BIG, note the vehicles around the launch pad...

http://youtu.be/B4PEXLODw9c


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161 replies: All unread, showing first 25:
 
User currently offlineZANL188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 1, posted (2 years 4 months 1 day 1 hour ago) and read 32767 times:
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Animation of what a fully reusable Falcon 9 launch (less the trunk it seems) might look like...

http://youtu.be/OX2-qEC7P_I



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User currently offlinenomadd22 From United States of America, joined Feb 2008, 1944 posts, RR: 0
Reply 2, posted (2 years 4 months 9 hours ago) and read 32767 times:

I'd been wondering how they'd get the 2nd stage on the ground since an M1D would be way too powerful. It looks like 4 small thrusters. Super Dracos don't seem likely since you'd have to add hypergolic tanks.


Anon
User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 3, posted (2 years 4 months 6 hours ago) and read 32767 times:
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2nd stage is the difficult bit. Personally I think they'll be doing well to get the 1st stage back.


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User currently offlineGST From United Kingdom, joined Jun 2008, 941 posts, RR: 0
Reply 4, posted (2 years 4 months 5 hours ago) and read 32767 times:



Quoting zanl188 (Reply 3):
2nd stage is the difficult bit.

Whilst that is probably true on the propulsion end, I'm not sure it is on the navigational side. The second stage is inserted into orbit and can be directed to de-orbit at any time with little fuel requirement and with the considerable aerobreaking meaning relatively little fuel will be needed to steer and retard the module for the final pad landing. The first stage does not get into an orbit, therefore to get it back to the initial launch pad requires you to burn not only to decelerate but indeed to reverse direction onto a ballistic trajectory back to the pad. This needs far more fuel, even for a relatively light stage. Much better IMO to land somewhere like the Azores (or possibly even further afield) and ship the rocket back home from there, which would still offer a saving over building a new one.

Of course the remote landing pad would somewhat complicate the weather requirements for go/no go decisions if the economics of the launch operation actually require the launcher to be reusable in every instance.

[Edited 2012-12-26 09:04:27]

User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 5, posted (2 years 4 months 4 hours ago) and read 32767 times:
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Quoting GST (Reply 4):
Much better IMO to land somewhere like the Azores (or possibly even further afield) and ship the rocket back home from there, which would still offer a saving over building a new one.

Quite a bit of fuel would be needed to get as far down range as the Azores. Seems to me the thing to do would be to land on a large barge, maybe an old oil tanker, or a spit of land somewhere.

The other problem with going back to the launch site is range safety. Titusville is just on the other side of the river from the launch site... would be bad to drop a first stage on the neighbors.



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User currently offlineGST From United Kingdom, joined Jun 2008, 941 posts, RR: 0
Reply 6, posted (2 years 4 months 3 hours ago) and read 32767 times:

Quoting zanl188 (Reply 5):
Quite a bit of fuel would be needed to get as far down range as the Azores. Seems to me the thing to do would be to land on a large barge, maybe an old oil tanker, or a spit of land somewhere.

More fuel than reversing direction? I'm not so sure. But I agree a floating pad would seem to be the most practical first stage recovery site as you can put it wherever is most convenient. Of course if it is convenient for first stage recovery it would almost certainly be in a location that you can easily bring the second stage down onto after payload insertion too which simplifies things massively.

Quoting zanl188 (Reply 5):

The other problem with going back to the launch site is range safety. Titusville is just on the other side of the river from the launch site... would be bad to drop a first stage on the neighbors.

True, but is it any worse than a first stage going boom shortly after liftoff and raining rocket fuel on the vicinity? I'd love to see the relative risk assessments of those!


User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 7, posted (2 years 4 months 3 hours ago) and read 32767 times:
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Quoting GST (Reply 6):
True, but is it any worse than a first stage going boom shortly after liftoff and raining rocket fuel on the vicinity? I'd love to see the relative risk assessments of those!

Generally on liftoff the boosters are heading away from populated areas... In this case the booster is headed towards a populated area, big difference.



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User currently offlineGST From United Kingdom, joined Jun 2008, 941 posts, RR: 0
Reply 8, posted (2 years 4 months 1 hour ago) and read 32767 times:

Yes they do if working correctly, but the [remote] potential for harm remains which is what I was referring to.

User currently offlinenomadd22 From United States of America, joined Feb 2008, 1944 posts, RR: 0
Reply 9, posted (2 years 3 months 4 weeks 1 day 22 hours ago) and read 32767 times:

Spacex seems to be getting pretty serious about the Texas site. That would change the 1st stage recovery equation some. Texas to Florida is a whole lot more practical than Florida to the Azores. That would only be about 20% further than the 1st stage impacts now. Just a little lower trajectory could put the 1st stage right where they want it.

[Edited 2012-12-26 16:07:54]


Anon
User currently offlineZANL188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 10, posted (2 years 3 months 1 week 6 days 8 hours ago) and read 32767 times:
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Some onboard video from last months test...

http://youtu.be/nUV6oqCFrFU



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User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 11, posted (2 years 1 month 1 week 5 days 21 hours ago) and read 32566 times:
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Latest test. Twice as high as the previous... Note the cowboy figure for scale...

http://youtu.be/orUjSkc2pG0



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User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 12, posted (1 year 9 months 2 weeks 4 days 23 hours ago) and read 30489 times:
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Another Grasshopper test from earlier this month...

http://youtu.be/eGimzB5QM1M



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User currently offlinemaxter From Australia, joined May 2009, 227 posts, RR: 0
Reply 13, posted (1 year 9 months 4 days 8 hours ago) and read 29703 times:

Nice, thanks for the links. I have no doubt that SpaceX can achieve what many others deem too difficult


maxter
User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 14, posted (1 year 8 months 1 week 6 days 22 hours ago) and read 28793 times:
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Flew a relatively aggressive lateral manuever yesterday.

http://youtu.be/2t15vP1PyoA



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User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 15, posted (1 year 7 months 2 weeks 1 day 22 hours ago) and read 27558 times:
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I wonder if SpaceX had to pay for lost dairy production?

http://youtu.be/HXdjxPY2j_0



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User currently offlinekanban From United States of America, joined Jan 2008, 4141 posts, RR: 29
Reply 16, posted (1 year 7 months 2 weeks 1 day 20 hours ago) and read 27527 times:
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Quoting zanl188 (Reply 15):
I wonder if SpaceX had to pay for lost dairy production?

Can't tell if they are dairy cattle.. if they are just skip one step in making yogurt.. they were however probably destined for beef and may be a little tough.


User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 17, posted (1 year 7 months 1 week 5 days 9 hours ago) and read 27112 times:
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SpaceX will attempt to soft land the 1st stage of upcoming Falcon 9 launch from Vandenberg.

http://www.usatoday.com/story/news/n...cket-set-for-risky-launch/2814865/

This Falcon 9 is the new version with 8 engines arranged in a circle and the 9th engine in the center.

http://www.spacex.com/falcon9

Although no landing gear will be installed on the 1st stage for this flight, they're trying for a soft ocean landing, this does represent the first use of Grasshopper technology.



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User currently offlinenomadd22 From United States of America, joined Feb 2008, 1944 posts, RR: 0
Reply 18, posted (1 year 7 months 1 week 5 days 8 hours ago) and read 27105 times:

Quoting zanl188 (Reply 17):
This Falcon 9 is the new version with 8 engines arranged in a circle and the 9th engine in the center.

Putting the eight outer engines evenly under the tank walls like that allowed them to simplify and lighten the thrust structure. The new engines are half again as powerful as the old M1Cs and required some major changes in the rocket.
The next Grasshopper should be a lot more production grade. You'll know it's getting serious when they start making flights every week.



Anon
User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 19, posted (1 year 6 months 4 weeks 1 day 22 hours ago) and read 26644 times:
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First Falcon 9 with the Grasshopper tech and uprated engines launches from Vandenberg on Sunday. I expect SpaceX will attempt to limit expectations, may not see any coverage. http://www.spaceflightnow.com/falcon9/006/status.html


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User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 20, posted (1 year 6 months 4 weeks 7 hours ago) and read 26440 times:
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Some words from Elon Musk regarding todays Falcon 9 launch:

"I give pretty low odds of this recovery working on this flight," Musk said. "The point of this mission is demonstrating the ascent of the crewed version of the Falcon 9."



Gotta love Musks brevity... Talking about stage recovery in one sentence... and a crewed version of Falcon 9 in the next... Lol!

Launch window opens at 0900 PDT, 1200 EDT, or 1600 GMT. About an hour and 20 minutes from now

http://www.spaceflightnow.com/falcon9/006/130928preview/

Where is MdmeConcorde?

Good luck SpaceX!



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User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 21, posted (1 year 6 months 4 weeks 5 hours ago) and read 26414 times:
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Launch appears to have gone well.

No word on the 1st stage soft landing other than a relight of the engines was achieved...



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User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 22, posted (1 year 6 months 3 weeks 6 days 23 hours ago) and read 26331 times:
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1st stage soft landing failed. Engines relit as planned however stage developed a roll due to aerodynamic forces. Roll forced propellants away from inlets and engine flamed out.

Next attempt at 1st stage soft landing: CRS-3

Launch video:

http://youtu.be/N0mLlO9enfY



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User currently offlinetravelavnut From Netherlands, joined May 2010, 1766 posts, RR: 7
Reply 23, posted (1 year 6 months 3 weeks 6 days 14 hours ago) and read 26258 times:

Elon also tweeted:

Elon Musk ‏@elonmusk 12u Between this flight & Grasshopper tests, I think we now have all the pieces of the puzzle to bring the rocket back home.

And that is pretty damn awesome me thinks!  



Live From Amsterdam!
User currently offlinezanl188 From United States of America, joined Oct 2006, 3680 posts, RR: 0
Reply 24, posted (1 year 6 months 3 weeks 1 day 5 hours ago) and read 25948 times:
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"SpaceX CEO and Chief Designer Elon Musk has laid out his plans for recovery and reusability of the first stage of the Falcon 9. The debut mission to launch the Cassiope satellite into orbit included a number of events that should help SpaceX recover and possibly even reuse the first stage of the Falcon 9 in 2014."



http://www.nasaspaceflight.com/2013/...plans-reusability-falcon-9-rocket/



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25 Post contains links zanl188 : Interesting view of Mondays Grasshopper test flight to 744 meters. View from a quadracopter. http://youtu.be/9ZDkItO-0a4
26 Post contains links zanl188 : Mission overview video of the last F9 launch. Contains a brief bit of video of the 1st stage relight. This link will start right after 1st stage sep..
27 Post contains links zanl188 : Pic of 1st stage impact... http://www.nasaspaceflight.com/2013/.../spacexs-dragon-moved-february-11/
28 maxter : Probably not known, but where is the best guess that grasshopper testing will go to from 744m? How soon do you believe the landing struts will be fitt
29 nomadd22 : They intend to put legs on CRS-3 in February, but won't delay the rocket if the legs aren't ready. The SE-8 and Thaicom missions require the full F9
30 nomadd22 : So much for my sources. Gwenne Shotwell from SpaceX now says "So what we're moving to now is what we call the Falcon Niner β€” Falcon 9R reusable β€”
31 zanl188 : Will this be Grasshopper 2 then? They'll need to fly it quick if they intended to recover CRS-3.
32 maxter : Yes thanks for that, wonder if they use it for CRS3 then, if so where will the recovery location be? Cheers and thanks
33 nomadd22 : I don't think there's serious consideration of landing the CRS-3 booster. They'd like to fly the whole recovery profile and test the leg deployment, b
34 Post contains links zanl188 : Pix here of the Cassiope first stage about to impact. Note engine appears to be firing... http://www.zerognews.com/2013/10/15/...d-video-of-next-gen-f
35 Post contains links zanl188 : CRS-3 will have legs and attempt soft splashdown of the first stage. http://www.nasaspaceflight.com/2014/...port-legs-attempt-soft-splashdown/
36 Post contains images travelavnut : A picture Tweeted by Elon ( https://twitter.com/elonmusk ); "Mounting landing legs (~60 ft span) to Falcon 9 for next month's Space Station servicing
37 nomadd22 : Well, in the space of two days, the three engine next version of Grasshopper made it's maiden fight at McGregor and CRS3 went off with the 1st stage m
38 Post contains links zanl188 : Video of yesterdays F9R flight: http://youtu.be/0UjWqQPWmsY Waiting for hard data on how CRS3 1st stage landing went... Going to be an exciting year
39 Post contains links zanl188 : Elon Musk / SpaceX press conference regarding CRS-3 boost stage landing. Also took question regarding law suit SpaceX recently filed against US Govt.
40 GDB : Another step in what could be one of the most significant advances in access to space ever. The mind boggles when you consider that if this becomes st
41 wingman : And to think, accomplished by one small company essentially still in it's infancy (relatively speaking) that is competing against master rocket build
42 zanl188 : At $400M a pop on a sole source contract I can understand why ULA wants to ride the gravy train as long as possible. As a taxpayer though I've got to
43 nomadd22 : The FH will actually be more of a problem. The center core will be a lot faster and farther downrange than an F9 first stage when it's separates, so i
44 tugger : Would you not simply go suborbital and circle round to "get it back home"? A Pacific landing could be fairly simple to achieve I would think. Tugg
45 zanl188 : Adds a lot of weight for thermal protection. Maybe when they sort out a way to recover the second stage.
46 AustrianZRH : Although not entirely related to the recoverable first stage, there's some pretty cool footage of the CRS-3 launch available on the tube: https://www.
47 Post contains links zanl188 : Latest F9R test, this time to 1000M.. http://youtu.be/ZwwS4YOTbbw
48 Post contains links zanl188 : FWIW, CRS-3 first stage landing video: http://www.spacex.com/news/2014/04/29/first-stage-landing-video Not much there but it's clear the legs deployed
49 maxter : Some info on CRS-3 soft ocean landing outcomes - Elon at the National Press Club https://www.youtube.com/watch?v=LcgfHslGjII
50 Post contains links zanl188 : More enhanced CRS3 landing video from NASASpaceflight.com. Shows leg deploy: http://youtu.be/XoufUV5oGTo Related news: FAA has published a draft envir
51 Post contains links zanl188 : F9R goes to 1000M and deploys steering fins.... http://youtu.be/DgLBIdVg3EM
52 nomadd22 : I hadn't heard of those grid fins before I saw that video. Pretty cool. It's starting to look like a spaceship.
53 zanl188 : I'd heard about the fins, wasn't sure what form they'd take. Didn't know they'd display so much motion... I'm getting the itch to see 3 cores return
54 Post contains links airplaneaddict : http://www.spacex.com/webcast/ launch in 16 minutes
55 zanl188 : Scrubbed due to a 2nd stage pressurization problem. Rescheduled to this afternoon at 1746 EDT. Not sure if they'll attempt a soft landing with the fi
56 nomadd22 : Not on land. But the ocean landing (oceaning?) will be a lot closer to shore, so they should get a lot better video. I'm wondering if it's about time
57 Oroka : I think that would be considered a controlled splash-down.
58 Post contains images zanl188 : Well it has legs... and shiny engines....
59 Post contains images zanl188 : Launch time now 1839 EDT, about 45 minutes from now. No webcast for this attempt... edit: scrub! No go for weather[Edited 2014-06-21 15:31:39]
60 nomadd22 : They'll try again tomorrow (Sunday) with a 4 hour window. Orbcomm is only half a payload, so they have plenty of leeway for a wide launch window and s
61 Post contains images moo : The Russians use them on the R-77 missile (a rough equivalent of the AMRAAM), and the have been used on the MOAB
62 zanl188 : They need to satisfy the FAA and the range that they can bring it back on target. I suspect the reason for no webcast yesterday is they knew weather
63 zanl188 : Scrubbed for weather today. I understand wx was bad enough they didn't even tank. Next opportunity looks like Tuesday afternoon.
64 Post contains links zanl188 : Final CRS-3 landing video restoration: http://youtu.be/CjZ33C9JZTM
65 Post contains links zanl188 : Orbcomm launch is now set for 1144 EDT today, a little more than 3 hours from now. Weather is 50/50 at the moment and gets worse as the day goes by.
66 zanl188 : Launch now set for 1115 EDT. Weather 60% favorable.
67 Tugger : Nice launch! Now wondering about the first stage recovery/landing.... Tugg
68 zanl188 : Twitter from Musk states: Rocket booster reentry, landing burn & leg deploy were good, but lost hull integrity right after splashdown (aka kaboom)
69 nomadd22 : All 6 satellites successfully deployed. The stage re-entered, deployed legs and made a soft landing, but the tank lost integrity and it sank. Could be
70 Post contains links zanl188 : YouTube video of 1st stage reentry and landing for the Orbcomm launch. Lens ices up after the reentry burn. http://youtu.be/CQnR5fhCXkQ
71 Post contains links zanl188 : http://www.spacex.com/news/2014/07/2...-lands-falcon-9-rocket-first-stage At this point, we are highly confident of being able to land successfully on
72 Post contains links zanl188 : Orbcomm launch first stage landing, as seen from plane.. http://youtu.be/uIlu7szab5I
73 Tugger : Interesting video. Nice stable fall though supersonic. Really sad that they lost track on the stage when they zoomed. I am surprised that he camera m
74 Post contains links zanl188 : F9R test flight terminated by flight termination system today near McGregor Texas... http://www.nbcnews.com/science/space...er-anomaly-over-texas-town
75 nomadd22 : Well, they said they were going to push it till it made an earth shattering kaboom. Chalk up a successful FTS test.
76 Tugger : I wonder if it took out the video drone... Tugg
77 Post contains images zanl188 : Well we know the space modulator works anyways. I hope not... Will SpaceX release the video if it didn't? I'm thinking not Still waiting for DreamCha
78 Post contains links zanl188 : SpaceX delaying Falcon 9 launches pending review of the F9R accident: http://news.discovery.com/space/priv...cial&utm_campaign=DiscoveryChannel
79 nomadd22 : They weren't going to since the problem with the test rocket wouldn't have been a problem with the real F9, but that and another helium leak got them
80 Post contains links zanl188 : SpaceX building floating platform to land Falcon 9 first stages... http://www.floridatoday.com/story/te...anding-floating-platform/17847817/
81 Post contains images zanl188 : SpaceX has a landing barge.....
82 nomadd22 : Hard to believe they built that just for a few tests. After they start returning to land, the platform might be for recovering the central core for th
83 zanl188 : Musk mentioned in another tweet yesterday that the barge had provision for a refuel & relaunch capability to get the first stage back to the launc
84 zanl188 : Musk tweet from yesterday: "Base is 300 ft by 100 ft, with wings that extend width to 170 ft. Will allow refuel & rocket flyback in future" He als
85 Aesma : Whatever the success of this, at least they do something, not just talk about it. Landing the thing, refueling it for a flight back to the launch pad
86 nomadd22 : I wonder if they added the "drone" after somebody noticed the unflattering acronym.
87 Post contains links zanl188 : Looks like on CRS-5, launching this friday, SpaceX will be making a serious attempt to recover the first stage. NASA TV will be covering the launch. h
88 zanl188 : SpaceX statement regarding CRS-5: X Marks the Spot: Falcon 9 Attempts Ocean Platform Landing During our next flight, SpaceX will attempt the precision
89 zanl188 : Also: CRS-5 may be delayed pending a good static fire of the first stage. Yesterdays static fire attaempt resulted in an abort.
90 Post contains links zanl188 : CRS-5 now set for 6 Jan... http://www.spacex.com/press/2014/12/19/crs-5-launch-update
91 nomadd22 : The static fire ended early, but was enough to OK launch if they wanted. But, they're being their normal overcautious selves and solar angles at the S
92 zanl188 : They also did a second static fire that was successful.
93 zanl188 : About 30 minutes now to the launch of CRS 5. SpaceX will attempt to recover the first stage booster by landing it on a drone ship. No issues being wor
94 teme82 : At 1:30 minutes in countdown the thing was to put on hold. :/
95 zanl188 : Unspecified actuator problem.
96 Post contains images teme82 : Yeah. Looks like next try in Friday at 5:09 am. Good time for me
97 zanl188 : New launch time: Jan 10 0445EST or 0945UTC Needed an extra day to evaluate previous launch attempt
98 zanl188 : CRS 5 first stage made it to the drone ship but landed hard. Drone ship is fine though stage crashed. Per Musk. Great first attempt. I'm sure they'll
99 Post contains links zanl188 : NASA cancelled post launch news conference. Unusual move I think. http://blogs.nasa.gov/spacex/2015/01...t-launch-news-conference-canceled/ I expect t
100 Tugger : Hmmm... not really Elon's style. In fact he tweeted pretty soon afterwards "Close but no cigar". My guess is they both realized that the landing atte
101 zanl188 : Well it wasn't SpaceXs press conference, and I think NASA knew all the questions would be about the booster landing... Musk tweeted a bit ago that th
102 teme82 : Well if they already made the darn thing why keeping it idle and gathering some dust? I bet they got loads of data that they need for perfecting the
103 francoflier : I'm guessing they want to gather more data before facing the press. I doubt anybody's expectations were that high that they'd think this would be a w
104 GDB : Agreed. It's a goal that is well worth working towards, mishaps included. It would be such a game changer well beyond Space X's bottom line. Better l
105 Post contains links zanl188 : The drone ship just pulled into port. Pix here: http://i.imgur.com/B8jGQk3.jpg http://i.imgur.com/hmV0WsT.jpg I see some charring and maybe some wreck
106 moo : I'm seeing elsewhere its being reported as a exhaustion of the hydraulic fluid controlling the descent vanes - they hadn't properly accounted for the
107 Post contains links Tugger : Here are some images of the touchdown/impact: http://qz.com/328139/elon-musk-relea...cex-rocket-on-a-floating-platform/ Gotta love Musk's flare for th
108 Post contains links zanl188 : Video of the landing here. Close but no cigar.... https://vine.co/v/OjqeYWWpVWK http://vine.co/v/OjqeYWWpVWK RUD is actually a rocket scientist acrony
109 Post contains links and images Tugger : Wow, cool! I also would like to see the rockets point of view but the nighttime (early morning?) darkness obviously hinders what it can provide. The
110 zanl188 : The other rocket acronym I hear used quite often is CATO.... catastrophe at take off
111 Post contains links zanl188 : Next Falcon 9 1st stage landing attempt: Jan. 31 Falcon 9 β€’ DSCOVR Launch time: 2330 GMT (6:30 p.m. EST) Launch site: SLC-40, Cape Canaveral Air For
112 moo : I'd guess its similar to PEBKAC in computer circles.
113 jollo : Not really: PEBKAC is when IT people get defensive / offensive vs. users (akin to RTFM or ID10T...) IMO, RUD sounds a bit self-deprecatory. A bit lik
114 moo : Completely disagree - PEBKAC is when there is no issue with the hardware or software, but rather the user is doing something wrong. Its a legitimate
115 Post contains images kanban : For us old farts, please spell out the phrase each time a new acronym is introduced..
116 Post contains images moo : PEBKAC is Problem Exists Between Keyboard and Chair. ID1OT speaks for itself RTFM is Read the Fine Manual.
117 Post contains images jollo : Aw, I guess it depends on the (cultural) context. I think that in 20 yers I've never heard PEBKAC used without a definite, if implicit, meaning of "i
118 tommy1808 : I guess it's a healthy case of "sometimes you win, sometimes you learn" attitude coupled with the financial means to absorb the learning experience.
119 Post contains images jollo : Very well put. This will become a favorite quote of mines. Besides, the "lesson" was pretty awesome: they came *really* close to soft-landing the thi
120 Tugger : The attitude element will be what interests me the most. They are aiming for a REALLY small target. That is a lot of final targeting work for the sys
121 ZaphodHarkonnen : I think it's more a case of anything hitting within a couple hundred metres would be considered a win on their first proper landing attempt. From day
122 zanl188 : DSCOVR mission launch has slipped to 8 Feb at 1810L
123 Post contains links zanl188 : Livestream link to todays launch: http://new.livestream.com/spacex/eve...679f25&acc_id=6225011&medium=email
124 Post contains images zanl188 : Autonomous Spaceport Drone Ship as refurbished after the accident on the last launch. I understand "Just Read The Instructions" is a reference from sc
125 Post contains links zanl188 : Today is Jules Vernes birthday. Good Omen? http://en.wikipedia.org/wiki/Jules_Verne
126 Post contains images zanl188 : Mid section of the booster launching tonight. Good view of the grid fins - these ran out of hydraulic fluid on the last landing attempt.
127 zanl188 : Scrubbed due to a tracking problem. No other launch opportunities today due to the instantaneous launch window. Edit: Air Force tracking radar went do
128 zanl188 : DSCOVR launch scrubbed due to upper level winds.
129 zanl188 : DSCOVR got off just a few minutes ago. No landing attempt though due to sea state and failed thruster on the ASDS.
130 zanl188 : Musk tweets 1st stage landed vertically and within 10 meters of target. Good news...
131 AviationAware : In case anyone is wondering (as I did) regarding the scale of the ship and Elon Musk's tweet saying the landing was within 10 meters of target: That m
132 nomadd22 : That barge is around 1300 tons dry and probably has more than 1,000 tons of ballast. More, if the seas are heavy. And, barges are pretty much impossib
133 AviationAware : Thanks, that's what I thought.
134 Post contains images zanl188 : Reasonable shot of the water landing. I'd be surprised if SpaceX didn't have an aircraft or ship in the area that got better photos...
135 zanl188 : Per Aviation Week the ASDS is getting an upgrade to better handle extreme weather... SpaceX now intends to equip the vessel with additional station-k
136 Post contains links maxter : Well, hopefully a bit of further progress this time... http://www.businessinsider.com.au/sp...-falcon9-ocean-landing-test-2015-4 I would love to see t
137 zanl188 : Next attempt at Falcon 9 1st stage landing on the ASDS will follow the CRS-6 launch which occurs 13 Apr at 1633 EDT or 2033 GMT.
138 Tugger : Launch scrubbed due to weather. Next launch attempt is tomorrow.
139 zanl188 : Tomorrows attempt is scheduled for 1610 EDT or 2010 GMT
140 Tugger : Where (approximately) off the coast in the landing drone ship? Tugg
141 nomadd22 : About 200 miles ENE of Jacksonville, Florida.
142 Tugger : Successful lift-off! Now we wait for the landing... Tugg
143 Tugger : Where will the first news appears on the success or failure of the landing attempt? Elon's Twitter account? Or...? Tugg
144 Post contains images Tugger : Elon's Twitter: "Ascent successful. Dragon enroute to Space Station. Rocket landed on droneship, but too hard for survival." Ah well, darn. Next time
145 Post contains links casinterest : Have to see more of the feed, but from the initial snapshot, they were in much better position this time http://www.spacex.com/webcast/
146 GST : https://vine.co/v/euEpIVegiIx Video of the landing here, they were much much closer to success this time, perhaps without such massive last moment cor
147 francoflier : I wonder if there is any damage to the barge - sorry - 'droneship'. It looks quite fiery towards the end.
148 rcair1 : I would not call that a stabilized approach! Pretty massive excursions. But - it is neat how you can see the plume being directed.
149 Post contains links Tugger : Same link GST posted above just clickable on A.net: http://vine.co/v/euEpIVegiIx Not only the lateral corrections but it really looks like its coming
150 zanl188 : I thought the booster landings would be more like Grasshopper... Get to about 800 ft or so, get stabilized, then start down in a controlled manner. Ar
151 Tugger : Watching the video (over and over and over and...) it appears they start the refiring for slowing too late. You can see it is a "small flame" at firs
152 2T2X1 : I wonder if the available fuel would allow for a Grasshopper-type stepped approach. Or maybe this was a test of a more economical (albeit high-speed)
153 GST : It looks like an attempt at a "suicide burn" profile, very efficient but also very risky if you start decelerating too late, or start too early but w
154 Post contains links zanl188 : Enhanced, color corrected video. http://youtu.be/BhMSzC1crr0 Just Read The Instructions is going to need another paint job...[Edited 2015-04-15 15:45:
155 rcair1 : Deceleration should be very deterministic. Gravity does not vary much at those altitudes. It may look scary but they should be able to pretty precise
156 Post contains images Tugger : If the ship could talk (or think like it does it in the book series... ) And sorry that it wasn't a success but that was a really good, spectacular e
157 rwessel : No, I don't think so. The vertical velocity is pretty low at the point of contact. Where it looks like they went wrong is that the bottom of the vehi
158 Post contains links zanl188 : Landing video from the ASDS: http://youtu.be/vmJK_v5wRZw
159 nomadd22 : This isn't Grasshopper. F9 first stages have a thrust to weight ratio much higher than 1, even at minimum throttle, so it has to fire a burst right be
160 Post contains links and images Tugger : Yes, I agree, and I have to laugh and the audacity of my comments simply because here I am making "statements" that of course have none of the multip
161 Post contains links sharles : "Cause of hard rocket landing confirmed as due to slower than expected throttle valve response. Next attempt in 2 months." http://www.reddit.com/r/spa
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