Atlantis – 8 July 2011 First Launch Attempt

STS-135 July 8
STS-135 two hours before launch
Image Credit: KSC TV Feed

At 6:44 AM Phoenix time (1344 UTC) launch is about 2 hours away. At the moment we are ‘no go’ due to cloud density over the launch site. NASA-TV is here, and the Kennedy Space Center video feeds can be found here for weather and pad cameras.

Weather
Weather 90 Minutes Before Launch
Image Credit: KSC TV Feed

The countdown is at T-minus 20 minutes and holding, with a ten minute built in hold.

At 7:21 AM Phoenix (1321 UTC) the count has resumed and will go down to T-minus 9 minutes for the next built in hold.

Ops Commit
Ops Commit Criteria 60 minutes before launch.
Image Credit: KSC Video

Weather is now a ‘go’. The Ops Commit Criteria are all green.

The launch is now at T-minus 9 minutes, with a 41 minute built in hold. This will set up the launch, with the window opening at 15:22:13 UTC.

The launch is expected at 15:26 UTC. The countdown will resume at 15:17:46 UTC

Poling of the main systems is complete, and everything is go.

T-minus 4 minutes.

Steering check of the three main engines. Solid rockets are armed. The auxiliary power units have been started.

T-minus 2 minutes.

T-minus 60 seconds.

T-minus 31 seconds and a failure at the moment of hand-off to the internal computer.

Retraction of the event arm confirmed.

The count has resumed.

And launch.

Launch
Launch
Image Credit: NASA TV

Seven minutes into the flight, all systems are go.

At eight minutes we have main engine cutoff and external tank separation.

All three APU systems and all three fuel cells are operating normally.

Atlantis will now begin chasing the International Space Station, anticipating docking two days from now.

Atlantis – The Last Space Shuttle Flight


STS-135 on the pad July 4th
Image Credit: KSC TV Feed

Processing of the space shuttle Atlantis continues today, July 4th, in preparation for the July 8 launch.

Here are the launch windows for Atlantis (times are UTC):

  • 8 July – 1521-1531
  • 9 July – 1459-1509
  • 10 July – 1433-1443

After that is a five day period reserved for a Delta IV launch. The next launch window is 16 July beginning at 1211 UTC.

The primary objective of STS-135 is to deliver a Multi-Purpose Logistics Module (MPLM) carrying 9,500 lbs of cargo, a Lightweight Multi-Purpose Equipment Support Structure Carrier (LMC), and a Station Power Distribution Unit (SPDU). The LMC will carry the Robotics Refueling Payload to the ISS and return the failed Pump Module (PM) from the ammonia cooling system. Additional ISS equipment and supplies will be carried up.

The current mission for Atlantis is to deliver as much stuff as possible to the Space Station before we come to rely on the Russian Soyuz M, European ATV, Japanese HTV, SpaceX Dragon and Orbital Sciences Cygnus resupply missions.

A long history of the Atlantis missions can be found at NASASpaceFlight:

A complete guide to NASA TV coverage can be found here.

Pintle Injector Rocket Engines

We have had several queries concerning “pintle injectors” (make sure you read the last paragraph of this post), as these are mentioned in the Space-X page on the Falcon 9, where it refers to the Merlin rocket engine and the “pintle style injector“:

The main engine, called Merlin 1C, was developed internally at Space-X, drawing upon a long heritage of space proven engines. The pintle style injector at the heart of Merlin 1C was first used in the Apollo Moon program for the Lunar Excursion Module (LEM) landing engine, one of the most critical phases of the mission.

Based on the queries and the Space-X information, we went sleuthing. First, we came across the fact that TRW built the LEM descent engine, which used the pintle injector. We ran across David Meerman Scott’s blog apolloartifacts for a discussion and look at a model of the famous Lunar Module Descent Engine (LMDE). The engine was made famous by the Apollo 13 mission, where:

the Service Propulsion System (SPS) was never used subsequent to the cryotank stir/explosion. Because the extent of damage to the SPS was unknown, there was great concern at the time that collateral damage could have caused a catastrophic malfunction (if the engine was fired). Instead the LMDE was used for the return burn and subsequent course correction. Quite a famous engine.

In 2000, TRW demonstrated the TR-106 engine (pintle injector) using LOX / LH2 at NASA’s John C. Stennis Space Center . The engine generated 650,000 pounds of thrust, more than the 400,000 pounds of thrust generated by the Space Shuttle Main Engine SSME. Al Frew, vice president and general manager, TRW Space & Technology Division stated:

Most engines are designed for maximum performance and minimum weight, but we deliberately set out to develop an engine that minimizes cost while retaining excellent performance. We believe this engine will cost 50 to 75 percent less than comparable liquid hydrogen boosters. By reducing engine costs, which make up almost half of the cost of a launch vehicle, we will reduce the cost of launch vehicles and access to space for government and commercial customers.

Despite the promise the motor demonstrated, NASA canceled further work.

The pintle injector engines have a long history in the former Soviet Union. The NK-33 was the successor to the NK-15 engines used in the failed Soviet N1 Moon launcher. NK-33 have been used with the Russian Proton launch system. An interesting discussion of the Soviet Moon rocket, its engines and the NK-33 successor can be found here, along with spectacular video of the launch and explosion. Orbital Sciences has now contracted with Aerojet (owner of the NK-33 engines) to finish developing and testing the NK-33 engines, now designated as AJ26-58 for the Taurus II.

Jonathon Goff, at Masten Space Systems, had a commentary at Selenianboondocks on the 2006 Space-X change from an ablative Merlin engine to a regenerative engine. Jon states that the “engine related problems are interrelated, and that they have to do with the combination of using a high chamber pressure engine design with a pintle-injector and an ablatively cooled chamber wall.” That is, the flame produced by the cone of fuel and oxidizer hits the wall of the chamber and overheats the wall.

Included in the commentary is a simplified image of a pintle injector rocket engine, which illustrates the flow of liquid oxygen and fuel (RP-1 or liquid hydrogen) through the pintle injector into a cone shaped spray in the combustion chamber.

The replacement of the ablative chamber with a regenerative chamber eliminates the overheating.

Pintle Injector
Pintle Injector
Image Credit: Forschungsgruppe Alternative Raumfahrtkonzepte

Below left is the business end of the LEM Descent engine, showing the Pintle Injector:

Below right is an image by Warren W. Thompson at the unveiling of Space-X’s Falcon 1 at the Air & Space Museum on 4 December 2003.

LMDE
Lunar Module Descent Engine
Image Credit: jurvetson on Flickr
Merlin Engine with Pintle Injector
Merlin Engine with Pintle Injector
Image Credit: Warren W. Thompson

Finally, while explaining the Pintle Injector to a friend, I realized that almost everybody who has a garden or tends a lawn has personal experience with pintles. You all use a nozzle on the end of your watering hose. Crank it down and you get a steady, narrow stream of water shooting out in a long arc. Crank it back the other way when you want to shut it off, and you get a wide, cone shaped fan spray. Now, turn off the water and look at the business end of the garden hose nozzle (please shut the water off first). There in the middle is a round pintle that moves back and forth as you crank the outer casing one way or the other. And the fan shaped spray of water with which you are familiar is what the fuel and oxidizer spray looks like inside the rocket engine. So take another look at the two images above and imagine the fan shaped spray. The only difference is that your spray of water doesn’t explosively combust and throw a rocket into space.

The Augustine Commission – Postmortem – SPI Symposium

The Space Policy Institute at George Washington University hosted a half day symposium “Assessing The Options Of The Augustine Commission For Human Spaceflight” on 28 September 2009, and has now released the Notes and presentations.

Some of the participants in the Symposium (and their presentations) were:

Dr. Scott Pace, Director of the Space Policy Institute, began the proceedings by outlining the nine goals set for in the 2004 Presidential directives to NASA. Some have been, or will be, achieved:

  • Complete the International Space Station
  • Safely fly the Space Shuttle until 2010
  • No later than 2008, begin a series of robotic missions to Moon

Some are in danger:

  • Develop supporting innovative technologies, knowledge, and infrastructures
  • Promote international and commercial participation in exploration

And some will not be met:

  • Develop and fly the Crew Exploration Vehicle no later 2014
  • Return to Moon with goal of 2015 and no later than 2020
  • Aggressive in-situ resource program and robust precursor program
  • Sustained human presence on Moon for national preeminence, scientific and
    economic purposes, leading to Mars and other places

Dr. Pace reviewed the steadily declining budget provided NASA over the past five years (see the Sally Ride Slides – especially this). These cuts total approximately $42 Billion through 2020 versus the original ESAS (Exploration Systems Architecture Study) program, which topped out at $10 Billion per year in 2016 and is now expected to be only $6.5 Billion.

A critical observation was that “Budget Proposals are Policy”. Irrespective of what is said and written about America’s space policy, the budget dictates what can and cannot be done.”

Finally, Pace asked “Are there economically useful activities in space that can sustain human communities in space? Citing examples in the chart below, he concluded that we just do not know if there is anything in the upper right hand box.

Chart 1

The first panel of speakers was led by Gen. Lester Lyles (ret), a member of the Augustine Committee. His comments (see the Notes), centered around the task of the Commission. The Commission was tasked with assessing the following:

  • Present human spaceflight program
  • Future of Space Shuttle and ISS
  • The necessity of heavy lift
  • Crew access to low earth orbit and alternatives
  • Strategies and alternatives beyond low earth orbit

Major themes to be kept in mind included: safety, reliability, innovation, affordability, and sustainability.

Finally, Lyles summed up the key findings of the Commission:

  • NASA needs the right mission with the right size
  • Without an adequate budget there is no way that NASA can take on the great things it is asked to and maintain a viable program for space exploration
  • International partnerships should be addressed in greater detail than they are currently – there is lots of opportunities for greater partnerships and activities
  • Shuttle program should be extended, whether it be for a few flights or longer, it makes sense to consider any way to minimize gap
  • “Great nations do great things” – human spaceflight is a task worthy of a great nation
  • Extending ISS a “no brainer”– bottom line is we are just now completing space station and the U.S. and its international partners have only just begun to utilize scientific capabilities – Could be extended to 2025
  • NASA needs heavy lift capability – Looked at Ares 1, Ares V, and Ares V Light, but did not recommend one or the other; rather it depends on your objectives in space
  • Committee views COTS program favorably; it should be continued – Strong potential for commercial space sector to service ISS
  • A non-mission specific, basic space technology program should be established to support exploration
  • There are human spaceflight pathways to Mars – Mars is the ultimate destination, but may not be the first
  • Committee laid out alternatives for Moon and Mars and defined risks as best as they could

Tom Young, former CEO of Martin-Marietta, spoke next. One of his major themes was that the current situation was being driven by budget, and that the decisions made today will influence the course of space exploration for the rest of the century. He hoped that following the great adventure of the twentieth century – landing on the Moon and returning – the twenty-first century would not be remembered for “we saved $3 Billion dollars”.

Quoting from the analysis by Dwayne Day at The Space Review:

Young also warned that in order for NASA to be a smart buyer and to ensure success, the agency needed in-house systems engineering talent. Echoing Scott Pace’s earlier comments, he said that during the 1990s the United States engaged in a number of “acquisition reforms,” including the Air Force’s reduction of oversight of contractor operation of launch vehicles like the Titan IV as well as some of the aspects of NASA’s “faster, better, cheaper” program. (Author’s note: Young was clear that he was not criticizing faster, better, cheaper in its entirety.) “We just fired all of the experienced people,” Young said, and adopted a policy that “government would sit in the back of the room” and let the contractors run the show. “That was a horrible mistake. The net result of that experiment was $11.2 billion in failures. We tried that experiment, it was a horrible failure.”

Young finished by echoing previous speakers that human space flight was a policy issue, not a budget issue. He would quote Lyles: “Great Nations do Great Things”.

Next up was Dr. Doug Stanley, who has worked at NASA and Orbital Sciences Corporation, and is currently from Georgia Tech. One of the items he discussed was the idea that the assumptions made by NASA have driven the designs. For example, if the Crew Exploration Vehicle (CEV) had not been required to go to the ISS, then the Moon mission would have been best accomplished with a dual launch of two identical rockets and an EOR-LOR strategy (Earth Orbit Rendezvous – Lunar Orbit Rendezvous). A single Shuttle Derived Launch Vehicle would be the most cost effective solution for the heavy lift requirements. But it would not be cost effective for ISS purposes.

On the other hand, if the focus had been solely on servicing the ISS, then commercial Evolved Expendable Launch Vehicles (EELV – Delta IV) would have been selected. It would have been cheaper and quicker to operational status than building a new rocket.

Instead, NASA had to satisfy both objectives. And therefore, chose to develop two new rockets (new engines, new tanks, new solid rocket motors). This was the riskiest and most expensive course.

Young concludes with two sets of recommendations:

White House should immediately decide on:

  • ISS extension through 2020
  • Shuttle extension into 2011 and/or beyond 2011
  • Beyond-LEO human mission destination(s) and time-frame
  • Out-year available budget
  • General policy towards commercial and international ISS crew transport

NASA should be allowed to then define design reference mission(s) and requirements and perform ESAS-like architecture study to:

  • Perform apples-to-apples cost/safety/risk comparison of Augustine-defined options and selected other combinations of options
  • Re-visit EELV/SDV trades – including side-mount
  • Perform detailed definition and economic analysis of propellant depots
  • Determine true cost/risk of “commercial” crew transport
  • Examine workforce impacts of options
  • Define more detailed budgets to support 2011 budget cycle

[Ed: One has to look back at Young’s comment above about NASA thinking that a SDLV “…would not be cost effective for ISS purposes” and wonder why they did not realize that the SDLV would only need to be used for a year or so until EELV could come on line for ISS and other LEO missions. The implication is that EELV would have been cheaper than Ares I, and SDLV would have been cheaper than Ares V.]

The second panel discussion, on science and international relations, was begun by Paul Spudis from the Lunar and Planetary Institute.

Dr. Spudis fundamentally disagrees with the “Four Canons” of the Space Program, enshrined in the Summary Report of the Augustine Commission:

  • Mars is the ultimate destination
  • Heavy-lift is a requirement
  • It is necessary to get the public excited
  • There is no problem at NASA that money cannot fix

He contrasts the Current Template with the Desired Template:

Current Template:

  • Custom-built, self-contained, mission specific spacecraft
  • Launch on expendable vehicles
  • Operate for set lifetime
  • Abandon after use
  • Repeat

Desired Template:

  • Incremental, extensible building blocks
  • Extract material and energy resources of space to use in space
  • Launch only what cannot be fabricated or built in space
  • Build and operate flexible, modular, extensible in-space systems
  • Maintain, expand and use indefinitely

Obviously, Dr. Spudis takes the Long View: “My objective is to move humanity into outer space. How do you do that? By living off the land.” He wants to find opportunities in the upper right corner of Pace’s matrix.

Next up was Tom Jones, with the Association of Space Explorers and a former astronaut. His comments are summed up nicely in the abstract to the paper he presented:

By conducting a series of piloted Near-Earth Object (NEO) missions beginning about 2020, the U.S. will reinforce the scientific, economic, programmatic, operations, planetary defense, and public outreach elements of its human exploration program. Astronauts exploring a NEO would provide synergistic scientific return from a new “planetary” surface, substantially different in origin, age, and composition from those of the Moon or Mars. Explorers would assay NEO resources vital to future U.S. economic activity in space, and demonstrate extraction and utilization techniques for water, volatiles, and valuable metals. Piloted missions will also provide structural and civil engineering data needed for future deflection of hazardous NEOs. Impact prevention is a common sense, “know your enemy” mission for human explorers; the public will support space-based efforts to better understand and prevent a damaging NEO collision with Earth. Astronaut expeditions to NEOs offer dramatic, high-profile opportunities to engage the public in ground-breaking exploration more than a million miles from Earth. Finally, in the event U.S. plans for a lunar return are delayed, NEOs offer a challenging suite of alternative destinations. Easier to reach than the Moon’s surface, NEOs will nevertheless broaden U.S. space capabilities, demonstrate a firm commitment to ambitious human space activities, and increase momentum toward the eventual exploration of Mars.

Dr. John Logsdon lead of his comments on the International Space Station and International cooperation by quoting Secretary of State Hillary Clinton, 16 July 2009:

“Our approach to foreign policy must reflect the world as it is, not as it used to be. It does not make sense to adapt a 19th-century concert of powers or a 20th-century balance-of-power strategy. We cannot go back to Cold War containment or to unilateralism. . . . We will lead by inducing greater cooperation among a greater number of actors and reducing competition, tilting the balance away from a multi-polar world and toward a multi-partner world.”

Dr. Logsdon advocated including India and China in multi-lateralization of space. The question in his mind was whether there would be Presidential leadership.

For the international perspective, Dr. Alain Dupas, Director of Strategic Studies at the Paris-based College de Polytechnique, presented his views on the Augustine Committee’s recent report. Europe, he said, has been under the impression that the United States had made a firm decision regarding it’s exploration program. Now, there are serious concerns about America changing its mind. Fortunately, he noted, the ISS would be supported at least through 2020. This bodes well for the discussions about the Global Exploration Strategy. Dupais noted that the Flexible Path option offered “interesting opportunities for Europe”.

Mr. Brett Alexander, from the Commercial Spaceflight Federation, led the third panel of the morning on security and commerce. One of the main points he made was that the Augustine Commission had fallen into a false dichotomy: having to choose between Ares I and commercial EELV access to space. The real issue is choosing Ares I or the International Space Station. NASA does not have the budget for both.

Finally, with regard to safety, Alexander noted that Astronauts will not fly on unproven commercial vehicles, and notes ironically that:

  • The Atlas V has a long and proven track record, and the team that puts it together and launches has a demonstrated track that goes beyond the vehicle itself.
  • Falcon 9 and Taurus II will have conducted multiple cargo flights to ISS under COTS prior to being permitted to ferry human crew to LEO
  • Contrast this with the fact that Ares 1X/1 will have completed only two test flights prior to being permitted to carry crew to LEO

Eric Sterner spoke next. He is a former Republican House Armed Services Committee staffer and currently a fellow at the Marshall Institute. He made several points concerning international cooperation as a policy decision. First, that “International cooperation is useful but policy makers should be aware international partnerships have risks. You inherit or import into your program all their bureaucracy, all the budget woes. ISS proves you can do it, but it took us 25 years.” And second, considering China. “How would the U.S. deal with human rights issues if China were a partner in space exploration? It matters what values you take into space. How do you deal with proliferation issues? The Clinton administration threatened to cut off space-related payments to the Russia for its proliferation behavior with Iran”.

Next to last was Robert Read from the Office of the Undersecretary of Defense. His remarks addressed the implications of NASA and space exploration for the Solid Rocket Motor industry. Historically, the Department of Defense (DoD) has relied on solid rocket motors for land base Minuteman III ICBM and sea launched Trident II D-5, as well as many other weapon systems. He notes that DoD is concerned that shutting down the Shuttle and SDLV programs will so shrink the market that the program might collapse. He points out that:

  • One Shuttle stack is equivalent to 10 Trident II D-5 and 17 Minuteman III missiles in terms of solid propellant weight
  • The DoD is concerned over the potential loss of SRM suppliers once the Shuttle is retired
  • The DoD will be studying the issue further, given the national security implications of further decline of the SRM industrial base.

From The Space Review article, Read’s comments concerning how delicate the industry is at the moment:

He recounted how a few years ago a small company was going to move its operations from Texas overseas. The company’s motivation was that 95% of its business was commercial and the government accounted for only 5% of its business. But moving its manufacturing overseas would have required the government to recertify all of the company’s components, at a cost of hundreds of millions of dollars to the DoD, and ultimately the American taxpayers.

Finally, John Karas of Lockheed Martin addressed the workforce issues. A major concern is the loss of talent. 35% of the workforce is eligible for retirement right now. Industry needs to see NASA with a realistic goal and adequate funding in order to attract new, young talent to learn from the old guard before they retire. America’s heavy lift capability is unmatched elsewhere, and will remain so. But it can, and is currently, slipping away with the confusion and disarray of the space policy and budget problems.

So what do we garner from this long discussion? The debate is a tug of war in many dimensions: practical, political, monetary and technical.

I would like commercial crew launch to Low Earth Orbit and the ISS, a single Shuttle Derived Heavy lift vehicle and propellant depots. But that’s just my opinion.