Dragon has berthed with ISS
After a successful launch three days ago Dragon successfully berthed with ISS on Friday, bringing 4,000 pounds of cargo, including an Italian-built expresso machine designed to work in weightlessness.
Tag: commercial
Sierra Nevada and Germany sign agreement
The competition heats up: Sierra Nevada has signed a new development agreement with Germany in connection with its Dream Chaser reusable mini-shuttle.
The agreement does not appear to involve any money and thus is largely symbolic. Nonetheless, it shows again that Germany is interested in having Dream Chaser built, and is throwing its support behind the manned spacecraft.
Russia delays first manned launch from Vostochny
The Russian government has decided to delay from 2018 to 2020 the first manned launch from its new spaceport at Vostochny because an earlier launch would require them to use equipment they expect to retire anyway.
While the construction problems at Vostochny might be a factory in this decision, I also believe there is truth to the claim above. If they launch in 2018, they will probably have to use the Soyuz rocket to launch crews into space. By 2020 they plan to have Angara completely operational, and will be ready to retire Soyuz. Why build the infrastructure for Soyuz when you plan to retire it in only a couple of years anyway?
The delay however indicates a more fundamental problem with the Russian top-down authoritarian culture. It shouldn’t take them this long to get Angara operational. The rocket was conceived shortly after the fall of the Soviet Union in the early 1990s. They’ve had almost a quarter century to build it. Even though they’ve only just done the first two test flights, there is no justification for it to take another five years to get all the configurations of the rocket flying.
If they want to compete on the world market, they are going to have to work faster than this. A competitive private company, rather than delaying the launch, would have pushed Angara to be ready sooner so that the the launch could happen on time, with Angara. That the Russians seem unable to do this indicates that they will not be very competitive in the coming decades.
“If life were only like this.”
An evening pause: A classic comedy scene from Woody Allen’s Annie Hall (1977). What especially makes the scene work is how realistic he portrays what it was like to stand in a movie line in New York in the 1970s.
Another hat tip to Phil Berardelli, author of Phil’s Favorite 500: Loves of a Moviegoing Lifetime.
SpaceX is considering a ground landing for its next first stage return attempt
The competition heats up: After its second attempt this week to land its first stage on a barge in the Atlantic, SpaceX is now considering landing their next attempt on the ground.
This shouldn’t be a surprise. The reason they have been landing over the ocean in these initial tests was for safety. The last two landings however had demonstrated that they can reliably bring that first stage back accurately and precisely. Since they have the ability to destroy the stage should it go off course, it seems reasonable to shift to land now and simplify their challenge.
Stratolaunch considers multiple rockets for its giant airplane
The competition heats up: Stratolaunch is now considering widening its options for the upper stage that can be attached to its giant airplane.
[Chuck Beames, president of Seattle-based Vulcan Aerospace, the parent company of Stratolaunch Systems] said the interest in alternative launch options is driven by the growing interest in small satellites, for which the current Stratolaunch system is oversized. A smaller vehicle, he said, could be developed more quickly and less expensively. “It takes a more near-term focus on revenue generation,” he said.
Stratolaunch could eventually support several launch vehicles, he said, with varying payload capabilities to serve different customers. “We’ll likely have multiple launch vehicle options,” he said. “Some will be available earlier than others.”
It appears they are revising their launch system airplane into a modular design with a variety of upper stages, depending on customer. Note also the focus on the growing small satellite industry.
An engineering analysis of the Falcon 9 first stage landing failure
Link here.
SpaceX founder and chief technology officer Elon Musk tweeted that “excess lateral velocity caused it [the booster] to tip over post landing.” In a later tweet that was subsequently withdrawn, Musk then indicated that “the issue was stiction in the biprop throttle valve, resulting in control system phase lag.” In this statement, Musk was referring to “stiction” — or static friction — in the valve controlling the throttling of the engine. The friction appears to have momentarily slowed the response of the engine, causing the control system to command more of an extreme reaction from the propulsion system than was required. As a result, the control system entered a form of hysteresis, a condition in which the control response lags behind changes in the effect causing it.
Despite the failure of the latest attempt, SpaceX will be encouraged by the landing accuracy of the Falcon 9 and the bigger-picture success of its guidance, navigation and control (GNC) system in bringing the booster back to the drone ship. The GNC also worked as designed during the prior landing attempt in January, which ended in the destruction of the vehicle following a hard touchdown on the edge of the platform.
Human tower competition in Tarragona, Spain
An evening pause: I worry at how badly the people at the bottom might be hurt when the tower fails. Nonetheless, this competition is a testament to the wild and crazy things humans will do for fun.
Hat tip Danae.
Why SpaceX’s first stage failure is really a magnificent success
Yesterday SpaceX attempted for the second time to land the first stage of its Falcon 9 rocket on an unmanned barge in the Atlantic. They failed, spectacularly.
I however consider this attempt to be a magnificent success. I also think they could fail at achieving this vertical landing for the next twenty launches and still those failures would each be a magnificent success.
Why? How can an engineering failure like this really be considered an achievement? It is very simple. Even if SpaceX continues to fail in its effort to recover its Falcon 9 first stage and reuse it, the possibility that they might succeed — demonstrated time after time by the company with each launch — has struck terror in the hearts of every other aerospace launch company. Each landing attempt shows SpaceX’s commitment to lowering launch costs while developing cutting edge engineering capabilities. Each attempt shows the world that they are the world’s leading launch company.
The result? Every other launch company in the world, both old and new, are scrambling desperately to lower their own costs as well as improve their own engineering.
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Antares failure cause pinpointed
A report from Orbital ATK has confirmed that it was a failed turbopump in the Russian first stage engine of its Antares rocket that caused the rocket to explode just after launch in October.
Video of Falcon 9 first stage landing attempt
The footage below is high resolution. Watch how the rocket comes in to the barge. It is once again astonishing that the rocket hits the target, but it is coming down very fast, and not very vertical. Like the Grasshopper tests, they need to slow it down more just before landing.
Patty Loveless & Vince Gill – My Kind Of Woman/My Kind Of Man
An evening pause: Hat tip Diane Zimmerman.