At the point of separation, the booster has jettisoned its entire payload and most of its fuel, so the energy required for the return leg should be significantly less than the initial burn.

As far as I know boosters would normally have some fuel left at separation, so the question is really how much more fuel is required for the return than the normal safety margin?

If the answer is "none" then you get your booster back almost for free... any higher amount is a tradeoff of cost of booster vs reduced payload.

Every account I've read suggests that if it can be made to work then it's a large cost saving, but then they said that about the Space Shuttle too.

The booster is not orbital. It's on a ballistic, suborbital flight just as for the Blue Origin booster. The second stage goes to orbit and note that they are not trying to recover that one at all, let alone land it.

In fact, the SpaceX booster does several deceleration burns in space, and so experiences less aerodynamic stress than does the Blue Origin booster, which actually flies faster, according to the article I linked above.

In case nobody caught it, this is not the first time a booster stage returns from space to land on its own power, not the first commercial launch booster landing nor even the first time it happened this year. Blue Origin's New Shepherd recently did just that. This lead to a bit of a war of words on twitter which quickly devolved to a "my rocket is bigger than yours" bragging competition. It's rather humorous therefore to hear this band of professional aerospace PR agents say that this is "history by being the first to fly back and land the first stage of our rocket to land" (@1:20).

Nonetheless an impressive mission and I congratulate their whole team for the accomplishment.

Needs more boosters...

[edit] and struts...

Poppet valve problem. Get a new brake booster.

http://www.britannica.com/EBchecked/media/47836/Vacuum-assisted-power-brake-for-an-automobile

Your video, Building and firing a solid rocket booster, has made it into the Top 15 New Videos listing. Congratulations on your achievement. For your contribution you have been awarded 1 Power Point.

Actually, this is true, but it's also only one of the recall items that GM has issued Recalls for this year.

"It recalled 8,208 of its 2014 cars on May 7, for example, because they might have rear brakes on the front wheels."

"GM says it has informed regulators about two more recalls imminent but not yet announced. The latest batch includes safety belt, air bag, transmission and electrical issues in a range of midsize sedans, full-size crossovers and SUVs, and pickups."


GM's U.S. recalls this year

Below are General Motors' recall of vehicles in the U.S. since Jan. 1

Date, no. of U.S. vehicles, models affected, recall defect

- Jan. 13: 324,970 of the 2014 Chevrolet Silverado and 2014 GMC Sierra for overheated exhaust parts

- Feb. 7 and 25: 1,367,146 of the 2005-07 Chevrolet Cobalt, 2006-07 Chevrolet HHR, 2005-07 Pontiac G5, 2006-07 Pontiac Solstice, 2003-07 Saturn ION, 2007 Saturn Sky, 2007 Opel GT, 2007 Daewoo G2X for ignition switch

- Feb 20: 355 of the 2014 Buick Enclave, LaCrosse, Regal and Verano; 2014 Chevrolet Cruze, Impala, Malibu and Travers; 2014 GMC Acadia for transmission shift cable adjuster

- March 17: 63,903 of the 2013-14 Cadillac XTS for brake vacuum booster

- March 17: 303,013 of the 2009 Chevrolet Express and GMC Savana for airbag

- March 17: 1,178,407 of the 2008-13 Buick Enclave, 2008-13 Chevrolet Traverse, 2008-13 GMC Acadia, 2008-10 Saturn Outlook for airbag

- March 17: 656 of the Cadillac ELR for electronic brake control

- March 28: 823,788 of the 2008-11 Chevrolet HHR, 2008-10 Chevrolet Cobalt, 2008-10 Pontiac G5, 2008-10 Pontiac Solstice, 2008-10 Saturn Sky, 2008-10 Opel GT, 2008-09 Daewoo G2X for ignition switch

- March 28: 174,046 of the 2013-14 Chevrolet Cruze for front axle shaft

- March 28: 489, 936 of the 2014 Chevrolet Silverado, 2014 GMC Sierra, 2015 Chevrolet Tahoe and Suburban, 2014 GMC Yukon and Yukon XL for oil cooler fitting.

- March 31: 1,340,447 of the 2004-06 Chevrolet Malibu and Malibu Maxx, 2004-06 Pontiac G6, 2004-07 Saturn Ion, 2008-09 Chevrolet Malibu, 2008-09 Pontiac G6, 2008-09 Saturn Aura, 2010 Cobalt, 2009-10 Chevrolet HHR for electric power steering

- April 9: 2,191,014 of the 2005-10 Chevrolet Cobalt, 2006-11 Chevrolet HHR, 2007-10 Pontiac G5, 2006-10 Pontiac Solstice, 2003-07 Saturn ION, 2007-10 Saturn Sky for ignition key cylinder

- April 24: 50,571 of the 2013 Cadillac SRX for acceleration lag

- April 19: 23,249 of the 2009-10 Pontiac Vibe (built by Toyota) for air bags

- April 24: 51 of the 2015 Chevrolet Silverado HD and 2014 GMC Sierra HD for diesel transfer pump

- April 29: 51,640 of the 2014 Chevrolet Traverse, 2014 GMC Acadia and 2014 Buick Enclave for inaccurate fuel gauge

- April 29: 56,214 of the 2007-08 Saturn Aura for shift cable

- May 7: 8,208 of the 2014 Chevrolet Malibu and 2104 Buick Lacrosse for brake rotors

- May 14: 111,889 of the 2005-07 Corvette for headlight low beams

- May 14: 19,225 of the 2014 Cadillac CTS for windshield wipers

- May 14: 140,067 of the 2014 Malibu for brake boost

- May 14: 2,440,524 of the 2004-12 Chevrolet Malibu, 2004-07 Malibu Maxx, 2005-10 Pontiac G6 and 2007-10 Saturn Aura for brake lamps

- May 14: 477 of the 2014 Chevrolet Silverado and 2015 Chevrolet Tahoe for steering tie-rod

- May 16: 1,402 of the 2015 Cadillac Escalade for passenger air bag

- May 19: 1,339,355 of the 2009-10 Saturn Outlook, 2009-14 Chevrolet Traverse, 2009-14 GMC Acadia and 2009-14 Buick Enclave for front seat belts

- May 19: 58 of the 2015 Chevrolet Silverado HD and 2015 GMC Sierra HD for loose fuse block

- May 19: 1,075,102 of the 2004-08 Chevrolet Malibu and 2005-08 Pontiac G6 for shift cable (expands April 29 Saturn Aura recall)

Total 18,666,842
( http://www.usatoday.com/story/money/cars/2014/05/20/gm-recalls-fine-goverment/9329481/ )

Very funny. Its always "scientists" who bring that up and who first brought that up. Do you even read those reports? Scientists and their studies (more like very flawed simulations) are always quoted. First they said (Mojib Latif and others) that there wont be any hard winters anymore due to AGW. After it became evident that those utterings were utter bullshit, they said that hard winters will be very often due to AGW (PIK and others) and after we got a normal winter again, they said that this is typical for AGW too (PIK and others again).
If it wasnt for them, this hype wouldnt be nearly where it is.

They just say what is convenient and what fits into their agenda. Its all about money and personal security. Nothing more nothing less, they just think its something different due to their indoctrination. AGW has become a huge self-sustaining (thanks to those corrupt "scientists") economic booster where insurances, scientists, politicians and many many companies (even oil companies - yes, check the global warming lobby) and their lobbies are benefiting from. Its simply not possible to talk about it objectively anymore. And if you try, people like you will come up and defend it like a religion, and prove this fact very quickly. Just look at "bio" fuels. Its a HUGE part of economy already, but it simply isnt eco-friendly at all. Instead people are starving because mono cultures are used instead of different plants for food, so much water is used for producing bio fuels that people have to suffer. The rain forest and others are cleared to be able to put more mono cultures up. Companies like Monsanto are becoming more and more powerful because of it and studies that bio fuels are bad for lots of engines are being censored or simply not funded since even car manufacturers profit from it when engines blow up sooner.

More extreme weather? Bullshit aswell. Thats simply not true, as quite a few (ignored by the "consensus") studies have shown. Its just the reports about even the tiniest things that have bloated up in the globalized and interconnected world of today and untold truths that are fooling you and of course the agendas that need to be kept upright with even the tiniest happenings that fit into it. Next time when you see a report, ask yourself if something like that would have been mentioned globally 20 or 30 years ago.

Take the flood in Pakistan for example. Oh, it was soooo bad and soooo AGW caused, oh the horror, we will all see the same thing and worse in our own countries if we continue to sin in the face of our go-- err scientists!
No, it wasnt. It was as normal as all the very common floods there before. It just wasnt mentioned that since the 70s Pakistans population has tripled and the vast majority of those people have settled down on the fertile lands around the (straightened!!!) rivers.

If that wasnt enough, people like you even completely ignore the fact, even if all their claims were true, that warm periods were ALWAYS much much better for this planet and its inhabitants than cold ones and colder ones than we have right now (we live in an ice age after all) were always bad, if not catastrophic.

And because of that fact I wont be that stupid and waste my time here with more replies, since you guys have made it very obvious already where you are coming from.

Just one little thing to think about for you guys (yeah I still have hope, though its prolly not very realistic), since the rest of my posts will get marginalized by your ignorance anyway:
Just because most scientists are pro-AGW doesnt prove crap. It was always only very few if not only a single scientist who tried to prove many other scientists wrong in their assumptions and most scientists were wrong and very arrogant, especially if they formed something like a society. But like before, there are thankfully still a few of them left who treat science as science and not as their religion or extension of their ego.

What annoys me is that this ad is absolutely a blame game.

The guy who pulls out is implicitly portrayed as the victim. He's dressed in "normal" clothes, has his kid with him, and the first words out of his mouth are "mate, I'm sorry". Everything about this ad is designed to illicit sympathy for him.

Look at this guy. Hard working kiwi bloke, cares about his kid (who's even in the right booster seat).

and he's murdered by an arrogant business man who's portrayed as unwilling to prevent the accident.

Finally what's the message of the ad? Not "be careful when pulling out onto a main road", but "slow down".

btw, you can edit your posts if you make a mistake.

YAYYYYY!

*edit
Yo hey...New-user booster-shot..
http://videosift.com/video/Doctor-Who-Credits-Iron-Man-3-style

Never ever EVER engage a troll. I can feel the hard-on from here. "Somebody said something to me! Somebody said something to me! I'm a really important person now!"

I knew that.

Well, I got my booster shot of knowledge. That should last me for awhile.

Found this Choggie: The rocket was fueled by Aluminum Perchlorate, which is also used in fueling the Space Shuttle Solid Rocket Boosters.

@mentality

You can enjoy the series if you like. I'm sure you have your reasons. I merely gave the reasons why I think it's a poorly written series. You can't dispute that, unless you claim I am not allowed to have my own opinions (which from what I can see are supported by many, many ex-George R. R. Martin fans).

I don't, and I am far from alone in my feelings toward the series. Every GoT booster says the same things as you. Problem is, it's a load. I read plenty of atypical fantasy, most of which I really enjoy. I stopped reading GoT when I realized it wasn't fun to read anymore.

Oh, and all the characters you mention either sucked IMO or were inaccessibly stupid, cruel, or annoying.

Pretending that it's good, because it's not enjoyable, is just pretentious by the way.

This place is turning into VideoSniff and could use a booster now and then. I bet I know who got the placebos.

She's saying we wear the party all over our bodies and faces
What allows me to speak in wild abstractions
The senseless killings gifts God gives us have no one to love them

It's the kind of thought that kills you twice on the way down
You might forget them but you're not nice they don't forget about you
How they claw me in my false or foster reflection
Is that my reflection in the Damascus play?
How they claw me in my foster or false reflection

You should call me sometime. I won't answer but, at least I'll know you care.
(How will you know it was me?)
You think I got caller ID?

I guess I should be happy for you, for your success and all that
But your fame ain't got nothing for us
I supported you kid, back when no one else did (oh yeah, oh yeah)
You know I waved your flag, back when no one else did
I just want things to be the way they used to be,
When you only set a place for me

The great chorus of my skull is choking on their dulcer tones
Ten lashes on the ass of anyone who even tries and
Heaven's patience glaring down at us filling your room with black b_tterflies

You don't have to try to steal no nothing from my heart
Because for you anything you want is always free
Send your freaky fantasies to my phone
Black Converse on and an ice cream cone
Now that I'm not a virgin to you you'll never walk alone
Far beyond the several years of shame
I live to make you call my name
(Call my name)

Guess I should be happy for you, for your success and all that
But your fame ain't got nothing for us
I was your booster babe, back when no one else cared (oh yeah, oh yeah)
You know I celebrated you (I'm hard for you girl),
Back when no one else even thought to
I just want things to be the way they used to be
When you only saved a seat for me
Come back! Come back!

I feel so at peace
Why is the sky karma
I think I'm the one I got from