SLS - space launch system (3-я попытка)

[silentpom]

а какая у него толщина стенок?

[Floppy Disk]

Больше фотографий по SLS здесь

[Apollo13]

Мечта Кенгуру

[triage]

 http://www.space.com/33691-space-launch-system-most-powerful-rocket.html
...
NASA officials have long maintained that the most muscular form of the SLS will be capable of lofting 143 tons (130 metric tons) of payload to low-Earth orbit (LEO). That's where the confusion comes in: The LEO capacity of the agency's famous Saturn V moon rocket was about 154 tons (140 metric tons), according to a 2006 U.S. Congressional Budget Office (CBO) report.

But arguments for the Saturn V's supremacy are based on a flawed, apples-to-oranges comparison, said Kimberly Robinson, manager of strategic communications for SLS at NASA's Marshall Space Flight Center in Huntsville, Alabama.

Specifically, the 143-ton figure for SLS refers to pure payload, whereas the Saturn V could loft 154 tons of "injected mass," Robinson said. 

That injected mass included the Saturn V's third stage, as well as the fuel present in the stage, according to the authors of the 2006 CBO report (who wrote that they sourced their information from Richard Orloff's "Apollo by the Numbers: A Statistical Reference" ).

The SLS team has calculated some apples-to-apples comparisons, and the new rocket comes out on top, Robinson said Aug. 3 during a presentation with NASA's Future In-Space Operations (FISO) working group.

"We have a payload mass to LEO of about 122.4 metric tons [135 tons] for Saturn V," said Robinson, who did not give the FISO presentation but chimed in to answer a question posed by a listener. (The FISO talk was given by Chris Sanders of Aerojet Rocketdyne, Bob DaLee of Boeing and Orbital ATK's Mike Fuller. These three companies are the prime contractors for SLS.) 

The "injected mass" capacity of SLS comes out to 173 tons (156.9 metric tons), Robinson added. She, Sanders, DaLee and Fuller all cautioned, however, that these numbers for SLS are not carved in stone.
"We're talking about a 130-metric-ton-class vehicle," Robinson said. "It doesn't tell you exactly the capability."
...

На русском языке

Спойлер

АниКей пишет:

... Новая сверхтяжёлая ракета-носитель Space Launch System (SLS), которую планируют использовать для пилотируемых полётов к Луне и Марсу, мощнее и грузоподъёмнее, чем Saturn V, который применяли в лунных миссиях США. Сотрудники NASA сообщили, что правильно пересчитанная масса выведения полезного груза на низкую околоземную орбиту (НОО) у SLS составила 156,9 тонны. Это абсолютный рекорд для мировой космонавтики, сообщает Space.com.
Изначально во всех подтверждённых источниках величину полезного груза, выводимого на НОО ракеты Space Launch System, оценивали в пределах от 79 до 129 тонн. Это меньше, чем у Saturn V, который мог вывести к орбите Земли около 140 тонн. Специалист NASA, менеджер по стратегическим коммуникациям проекта SLS Кимберли Робинсон (Kimberly Robinson) говорит, что проблема крылась в неправильных вычислениях.
"Сопоставляя эти числа, мы сравнивали абсолютно разные вещи. Для проекта SLS 129 тонн выводимого груза — это чистая полезная нагрузка, в то время как для Saturn V указывается "инжектируемая нагрузка" ( англ. injected mass ). В величину "инжектируемой нагрузки" включены не только чистая полезная нагрузка, но и массы третьей ступени и топлива, используемого для вывода на низкую околоземную орбиту. Если подсчитать аналогичную величину для ракеты-носителя SLS в модификации Block 2, получится 156,9 тонны. Это и делает её самой грузоподъёмной среди ракет, когда-либо создававшихся человечеством," — заявляет Робинсон.
Первый запуск Space Launch System запланирован на 2018 год. В рамках программы Exploration mission ракета запустит необитаемый блок Orion в недельный полёт вокруг Луны. ...

https://life.ru/t/%D0%BD%D0%B0%D1%83%D0%BA%D0%B0/891744/novaia_rakieta_space_launch_system_pobila_riekord_ghruzopodiomnosti

[свернуть]

[Floppy Disk]

How much will SLS and Orion cost to fly? Finally some answers Production and operations costs of $2 billion or less annually would be manageable.
ERIC BERGER - 8/19/2016, 6:09 PM

Спойлер

One of the biggest criticisms of NASA's Space Launch System rocket and Orion spacecraft is that they will be too expensive to fly. Namely—while the large rocket and sizable capsule appear to be more-than-capable vehicles that could form the core of a deep-space exploration program—will there be any money left after producing them for NASA to actually go and explore? Until now, this has been a question the space agency has offered only vague assurances about.

But on Thursday, when Ars sat down to interview NASA's Bill Hill inside the Michoud Assembly Facility, where the SLS core stage and Orion are assembled, the NASA manager was notably forthcoming. "We're just way too expensive today," Hill acknowledged. "It's going to take some different thinking and maybe a little bit more risk taking than what we're wanting to do today."
Hill should know. As deputy associate administrator for exploration systems development, he is the NASA headquarters official responsible for the development of SLS, Orion, and the ground systems at Kennedy Space Center. Hill said he has given managers of each of those three programs some targets for production and operating costs once the vehicles move out of the development phase and into production.
Top number
"My top number for Orion, SLS, and the ground systems that support it is $2 billion or less," Hill told Ars. "I mean that's my real ultimate goal. We were running at about three-plus, 3.6 billion [dollars] during the latter days of space shuttle. Of course, there again, we were flying six or seven missions. I think we're actually going to have to get to less than that."
Ars has learned that the agency's ultimate goal for annual production and operations costs is about $1.5 billion.
With the first test flight of SLS and Orion not coming before the fall of 2018 at the earliest—and a second flight not until the early 2020s—the programs will remain in the development phase for at least the next five to seven years. By the mid-2020s, however, NASA would like to fly the SLS rocket at least once a year—sometimes with Orion, other times with scientific payloads bound for the outer solar system or human spaceflight hardware. By the end of the 2020s, Hill said, NASA would like to reach a flight rate of two SLS launches per year.
These are ambitious cost and flight-rate goals considering the scale of these programs. But if the space agency could meet them, it would go a long way toward quelling two of the biggest concerns about SLS and Orion: their ongoing costs and low flight rate. Low flight rates, independent reports by the National Research Council and others have warned, are simply not sustainable over the long term.
Production and operations costs
Production costs are those associated with the manufacture of the launch vehicle, including materials, production labor, factory test and inspection, and integration performed at the manufacturing sites. Operations costs are those associated with the operation of the launch vehicle after completion of manufacturing, including green run testing, transportation, launch site assembly, flight operations, post flight analysis, and sustaining engineering.
Production and operations costs—P&O in NASA's acronym laden jargon—of $2 billion or less would leave a significant amount of money within NASA's budget for human missions to the vicinity of the Moon, to its surface, or eventually crewed missions to Mars. In fiscal year 2016, NASA received $3.7 billion for exploration systems development, essentially the SLS, Orion, and ground systems budget. The number is likely to grow to $4 billion before the decade's end.
If it could eventually spend half of that on deep space habitats, landers, surface living quarters, and myriad other systems, the agency could have the beginnings of a viable program in deep space. Such a program might become even more robust by the late 2020s, when NASA's human exploration program could potentially add much of the International Space Station's $3 billion budget wedge to deep space missions.
These remain big ifs, of course, as NASA struggled to contain these production and operations costs during the space shuttle era. However, outside of the small meeting room where Ars met with Hill, on the vast floor of the Michoud rocket factory, there were some signs that the agency has sought to control costs where possible. In this big facility where the agency once built the large external fuel tanks for the space shuttles, NASA is now assembling the larger still "core stage" of the space launch system rocket, the backbone of the rocket that contains its liquid hydrogen and oxygen propellants, avionics, and main engines.
During the space shuttle days, about 1,200 people worked at 40 stations to assemble the shuttle's external tank, which was a relatively simple design when compared to to the SLS core stage. Today, about 400 people with Boeing, the prime SLS contractor, work at a handful of stations to assemble the core stage. It represents a sign— a small but tangible one—that NASA might yet wrangle its big rocket and spacecraft costs into submission.

[свернуть]

[Salo]

https://www.nasaspaceflight.com/2016/08/sls-program-working-overtime-2018-debut/

[Floppy Disk]

NASA SLS Booster Nozzle Plug Pieces Fly During Test

[Apollo13]

http://www.nasa.gov/feature/b-2-test-stand-on-schedule-for-testing-space-launch-system-core

B-2 Test Stand on Schedule for Testing Space Launch System Core

A visit to the B-2 Test Stand at Stennis Space Center leaves no doubt – NASA's return to deep-space missions is drawing closer by the day. And the days until the flight stage that will launch the return is tested at the site are fewer than one may realize.

Before launching the new Space Launch System rocket on its first test flight with NASA's Orion spacecraft, the agency will deliver the core stage for the flight to Stennis for green-run testing. For the first time, the stage will be assembled with its four RS-25 engines, installed on the stand and test fired, just as during an actual launch.

Including evaluation and design phases, Stennis has been preparing the B-2 stand for core stage testing for five years and counting. It has been a busy time, but major construction projects are closing out and all is on schedule with just a year or so remaining, said Barry Robinson, manager of the B-2 Restoration and Activation Project at the site.

"Everything we're doing is part of the critical path for this mission," Robinson said. "And we'll be ready."

It has been an involved process that mirrors work done during the Main Propulsion Test Article Project at Stennis in the 1970s, when a space shuttle external tank, simulated orbiter and three main engines were installed on the stand and test fired just as during an actual launch.

Now, the stand will provide a sequel of sorts with its test of the SLS core stage – with a very big difference. This is no SLS mockup; the stage to be tested will actually fly.

"That is significant," Robinson explained. "Because this will be an actual flight article, we have to exercise extreme care. This is an aggressive plan based on historical data and a no-fail philosophy."

The work to prepare the stand for the stage testing was divided into three phases: restoration of the stand to its original design condition, buildout of the stand to accommodate the larger SLS core stage and completion of the special test equipment interfaces (structural, mechanical and electrical) needed for testing.

Robinson and others on the B-2 Test Stand restoration team are paying heed to every detail to make sure all is ready to go for the stand. Major restoration and buildout efforts have been completed. Some of those were sizable, such as extending the derrick crane atop the stand by 50 feet, repositioning the 1.2-million-pound original shuttle MPTA framework structure, adding another 1 million pounds of steel to extend the structure to accommodate the larger SLS stage and upgrading the massive high-pressure industrial water system to provide as much as 335,000 gallons of water per minute to the stand during test operations.

A weekly summary of test complex activity shows only three of five original work packages still open. Much of the remaining work on those packages involves completing equipment systems and final punch list items. Necessary upgrade work continues at the high-pressure gas facility that supports test operations. Work on the test stand tarmac is scheduled for completion in December. All of the packages are expected to be closed out in the next few months.

Some subsystem activation work already has begun, but the major activation efforts will occur this spring. The goal is to be ready for the April arrival of the core stage "pathfinder," a full-scale mockup of the SLS core stage. It will be installed on the stand for a critical "fit test" to make sure the stand is configured as needed for the actual core stage.

That will leave summer months to make any modifications that may be needed and to ensure all aspects of facility and test support systems are ready. The time is vital. The RS-25 engines that will power the SLS core stage are former space shuttle main engines, so Stennis has a long test history to build on in that respect. However, the SLS vehicle itself – and all of its configurations – is new, which poses challenges in preparing stand systems for testing.

"The sooner we can complete activation and fit checks, the longer we will have to make sure all is set to go for testing," Robinson said. "And we will make sure Stennis is ready."

Once installed, the core stage will undergo chill-down and hot-fire tests.

Per current plans, the actual SLS core flight stage will be delivered to Stennis for testing next fall. The timing would be perfect from a historical standpoint. The first shuttle MPTA test was conducted 40 years earlier, in 1977, making 2017 a perfect time for Stennis to add another chapter to the B-2 Test Stand "finest hour" record.

Ничего себе наворотили

[LRV_75]

Apollo13 пишет:
http://www.nasa.gov/feature/b-2-test-stand-on-schedule-for-testing-space-launch-system-core
 
Ничего себе наворотили  

Ну вот это я понимаю масштабы

[dmitryskey]

Да уж. Вот куда значит федералы мои налоги тратят :-)

[Сергей]

Интересно, при той же стартовой массе на ту же орбиту, сколько бы подняла РН на базе движков метан - кислород по схеме газ-газ ?

[Alex_II]

Apollo13 пишет:
Ничего себе наворотили

Да это 3,14-ц какой-то... А зачем там по бокам вертолетные площадки? Или это танцполы на 300 голов танцующих каждый?

[Alex_II]

Сергей пишет:
Интересно, при той же стартовой массе на ту же орбиту, сколько бы подняла РН на базе движков метан - кислород по схеме газ-газ ?

Сложно сказать - там совсем другая сухая масса ракеты будет... И УИ изрядно больше...

[Floppy Disk]

Alex_II пишет:

Apollo13 пишет:
Ничего себе наворотили

Да это 3,14-ц какой-то... А зачем там по бокам вертолетные площадки? Или это танцполы на 300 голов танцующих каждый?

Вообще-то их там несколько таких

[LRV_75]

Regular пишет: 
Вообще-то их там несколько таких    

ахах ))

[Floppy Disk]

[LRV_75]

херасе, бак водорода

[Дмитрий В.]

LRV_75 пишет:

Apollo13 пишет:
 http://www.nasa.gov/feature/b-2-test-stand-on-schedule-for-testing-space-launch-system-core
 
Ничего себе наворотили

Ну вот это я понимаю масштабы

Да, уж, башня обслуживания "Ангары" ни в какое сравнение не идет.

[Дмитрий В.]

LRV_75 пишет:
херасе, бак водорода

Да немного больше чем у шаттла.

[LRV_75]

Дмитрий В. пишет:

LRV_75 пишет:
херасе, бак водорода

Да немного больше чем у шаттла.

вид изнутри впечатляет