Chet Atkins & Jerry Reed – Muleskinner Blues
An evening pause: Hat tip Jeff Poplin.
Year: 2018
The first SLS mobile launcher is leaning
Though NASA says it is not a problem, they have now revealed that the very expensive mobile launcher to be used for the first unmanned SLS launch in 2019, is leaning slightly.
The notes spoke of engineers being concerned about a lean towards the North – which would be towards the rocket when mated – with the angle of the leaning claimed to be seen as increasing when the Vertical Stabilizer porch was installed. It was also claimed the ML Tower is twisting and this issue increased when the porch was installed. This was cited as the reason additional arm installations onto the Tower were placed on hold, until the leaning-twisting issue is understood. Next in line for installation are the ICPS (Interim Cryogenic Propulsion Stage) Umbilical Arm, the Crew Access Arm and the two Vehicle Stabilizer Arms.
NASASpaceFlight.com’s Philip Sloss took the concerns to NASA to ask for clarifications. NASA responded, saying “the ML leaning/bending was not the cause of the delay in the install of the Crew access arm. These are unrelated.” However, they did expand on the specific issue, mainly to note it is understood and does not currently require any additional mitigation or modification to the ML.
“NASA’s mobile launcher is structurally sound, built to specifications, and does not require a design change or modifications. As expected, the mobile launcher is not perfectly still,” a NASA spokesperson added.
Note that this mobile launcher is not compatible with the second SLS launch, which would be the first manned flight in 2023. NASA will either have to modify it significantly at great costs, or build another, discarding this launcher after only one use.
More details about SpaceX’s fairing recovery plans
Link here. The article has some additional excellent images, but it was this paragraph that I thought was most significant:
To oversimplify, after launch, the payload fairing separates (mechanically) from the second stage once Falcon 9 or Heavy has left behind the majority of Earth’s atmosphere. After separation, each fairing half orients itself for a gentler reentry into the atmosphere with cold nitrogen gas thrusters, likely the exact same thrusters used in part to achieve Falcon 9’s accurate and reliable landings. Due to their massive surface area and comparatively tiny weight, fairing halves effectively become exceptionally finicky and awkward sails falling through the atmosphere at insane velocities, with the goal generally being to orient each half like a boat’s hull to provide some stability. Once they are low enough, assuming they’ve survived the journey from TEN TIMES THE SPEED OF SOUND and 62 MILES above Earth’s surface to a more reasonable ~Mach 0.5 and maybe 5 miles of altitude, the fun parts begin. At this point, each fairing half deploys a GPS-connected parachute system (a parasail, to be exact) capable of directing the massive hunks of carbon fiber and aluminum to a very specific point on the surface of the ocean.
What we don’t yet know is whether SpaceX will have cameras on the fairing, and if so, whether they will make those images available to the public, during launch.
Planetary Resources misses fund-raising target
Capialism in space: Planetary Resources has failed to meet a recent fund-raising target.
A spokeswoman for Planetary Resources, Stacey Tearne, told GeekWire that financial challenges have forced the company to focus on leveraging the Arkyd-6 mission for near-term revenue — apparently by selling imagery and data. “Planetary Resources missed a fundraising milestone,” Tearne explained in an email. “The company remains committed to utilizing the resources from space to further explore space, but is focusing on near-term revenue streams by maximizing the opportunity of having a spacecraft in orbit.”
Tearne said no further information was available, and did not address questions about employment cutbacks. However, reports from other sources in the space community suggest there have been notable job reductions. For what it’s worth, Planetary Resources had more than 70 employees at last report.
When this company first appeared with a big splash, shouting its plans to mine asteroids, I said “Bunk, it’s going to be a smallsat telescope company for years to come, either looking at the Earth or into space.” And that is where we are. The “near-term revenue streams” hinted at above are certainly the kind of earth-observation imaging that numerous other smallsat companies are providing. Whether Planetary Resources can compete with the large number of already established smallsat earth-observation companies, however, is the big question.
Mining asteroids by commercial companies for profit makes sense, and will eventually happen. I think, however, that this company oversold its abilities when it tried to convince everything that this is what it planned to do, right away.
Metric – Twilight Galaxy
An evening pause: Hat tip to Edward Thelen for pointing me to this group.
April 11, 2013 Zimmerman/Batchelor podcast
Embedded below the fold. As I am in Israel and cannot do my regular podcasts with John Batchelor, he has dug up an appearance from April 11, 2013 and posted this today. He calls it “Classic Bob Zimmerman.” The topics included a description of the cracks that occurred in one of the early Orion test capsules, and where I expressed then my doubts of SLS/Orion. In the five years since the only thing that has changed is that they have had to delay its upcoming missions by several years.
» Read more
Giant net to catch Falcon 9 fairing
This link provides a series of pictures, taken from a distance, of the giant net, and the structures that hold it up, that will be used by the SpaceX barge ship to try to catch the rocket’s fairing during its next launch later this week. (See comments.)
Hat tip reader Kirk Hilliard. The pictures don’t show the barge itself, but they do give a sense of the size of the net. This suggests that SpaceX has equipped the fairing with small jets capable of guiding it to the barge, where it will be caught as it falls at high speed. It could also be that they have found that the fairing itself can act as a parachute and slow itself down as it descends, meaning that impact will not be that intense.
Regardless, I wonder if they will have any cameras on board either the fairing or the barge, and whether they will broadcast them live as it comes down. I wouldn’t be surprised if they didn’t, as it would possibly reveal proprietary information, but the images would certainly be impressive to see.
If they succeed, they will have a rocket that is almost entirely reusable, with only a single 2nd stage engine (out of 10 total) and the second stage itself not reused.
Posted from the Israeli city of Tiberius on the shore of the Sea of Galilee.
Mars Reconnaissance Orbiter in safe mode
After detecting low battery voltage, Mars Reconnaissance Orbiter (MRO) went into safe mode on February 15.
The orbiter is solar-powered but relies on a pair of nickel-hydrogen batteries during periods when it is in the shadow of Mars for a portion of each orbit. The two are used together, maintaining almost identical charge during normal operations.
The spacecraft remains in communication with Earth and has been maintaining safe, stable temperatures and power, but has suspended its science observations and its service as a communications relay for Mars rovers. Normal voltage has been restored, and the spacecraft is being monitored continuously until the troubleshooting is complete.
It appears that all is under control. If MRO goes down, however it will a big loss for Mars research, as the spacecraft not only produces the highest resolution images of the ground, it also acts as one of several communications satellites between the Earth and the rovers on Mars. With two rovers there now, and at least two more planned for arrival in 2020, the loss of this communications link would be crippling.
Aligned erosion lines of Perseverance Valley
The uncertainty of science: Last week, while I was flying to Israel, the Opportunity science team announced the discovery of strange aligned erosion lines, what they are calling stone stripes, in Perseverance Valley.
The ground texture seen in recent images from the rover resembles a smudged version of very distinctive stone stripes on some mountain slopes on Earth that result from repeated cycles of freezing and thawing of wet soil. But it might also be due to wind, downhill transport, other processes or a combination.
…On some slopes within the valley, the soil and gravel particles appear to have become organized into narrow rows or corrugations, parallel to the slope, alternating between rows with more gravel and rows with less.
The origin of the whole valley is uncertain. Rover-team scientists are analyzing various clues that suggest actions of water, wind or ice. They are also considering a range of possible explanations for the stripes, and remain uncertain about whether this texture results from processes of relatively modern Mars or a much older Mars.
For those who are regular readers of Behind the Black, you already knew about a variation of this discovery back in November 2017, from my regular rover updates. Then, they discovered aligned groves in the gravel that looked to me like slickensides, erosion patterns produced by glacial activity. The science team told me, however, that they were favoring wind, not ice, as a primary cause, though that conclusion was far from certain.
In the press release last week, they focused more on the aligned erosion patterns in the fine gravel that appear to align perpendicular to the slope. Though they think they have found a comparable Earth-based phenomenon that might explain these patterns, it appears that the science team remains just as unsure of their cause as they are for the rocks.
Air Force reconsiders rocket engine, aims for small rocket launches
Two stories over the past few days indicated some shifts in the Air Force’s commercial space contracting policies.
- Air Force and Aerojet Rocketdyne renegotiating AR1 agreement
- Air Force moves to buy small rocket services
The first story has to do with ULA’s Atlas 5 and future Vulcan rockets. The engine that Aerojet Rocketdyne has been building, AR-1, has received significant subsidizes from the government for its construction, even though its only potential customer, ULA, has said it prefers Blue Origin’s BE-4 engine. ULA has not made a decision yet on which engine to use, but my sense of the politics here is that the main reason ULA is considering the AR-1 is because of heavy political pressure. Nonetheless, it makes sense for them to hold off from a final decision when they have two competitors.
The story suggests however that Aeroject Rocketdyne itself lacks confidence in the engine. It wants to renegotiate its Air Force contract so that it doesn’t have to invest any of its own money on development. This suggests the company no longer expects to get any contracts for it, and thus doesn’t want to spend any of its own money on it. With that kind lack of commitment, the Air Force would be foolish to change the deal.
The second story outlines how the Air Force is now committing real money for buying launch contracts with smallsat rocket companies, something it has hinted it wanted to do for the past year. The idea is for them to depend on numerous small and cheap satellites, capable of quick launch, givingthem a cushion and redundancy should an enemy nation attack their satellites. It will also likely save them money in the long run.
Oktapodi
An evening pause: To close out the week of Valentine’s Day.
Hat tip Jim Mallamace.
Evergreen State College expects 20% drop in enrollment
The president of Evergreen State College is predicting that the university will see a drop in enrollment in the coming year just below 20%.
President George Bridges has told the campus community that the school’s 3,800 student population is predicted to hover at about 3,100 when the 2018-19 school year begins. This 700-student loss represents an 18.5 percent decrease.
This estimate sent shock waves among faculty, and some speculate it spurred an anonymous call for Bridges’ resignation by way of flyers recently inserted into faculty mailboxes declaring “Please Resign,” among other disparaging comments.
The Olympia, Washington-based school already was hit with a 5 percent enrollment decrease when it started this current 2017-18 school year.
I am surprised and somewhat disappointed that the drop wasn’t more. After the attacks on free speech last year, I wonder why anyone would want to attend this college, especially since it appears the college’s administration continues to refuse to do anything to really change things there.