Space Rope Trick Experiment Goes Awry

Tjeerd writes "An experiment that envisaged sending a parcel from space to Earth on a 30-kilometre tether fell short of its goal yesterday when the long fibre rope did not fully unwind, Russian Mission Control said. It was intended to deliver a spherical capsule, called Fotino, attached to the end of the tether back to Earth — a relatively simple and cheap technology that could be used in the future to retrieve bulkier cargoes from space.""

Comments

Re:it's funny because it's true

[CRCulver]

Speaking of UPS, what happened to the idea that express parcel companies would be major forces behind private space exploration? In Michael Flynn's novel Firestar FedEx is one of the first companies to buy private spacecraft because it sees major profits in being able to deliver anywhere on Earth in just a couple of hours. But when you read about private space ventures here on Slashdot, parcel companies don't play any sort of role.

Previous try

[Harmonious Botch]

From new scientist

Experimental space tether fails to deploy * 15:17 11 May 2007 * NewScientist.com news service * Kelly Young A trio of mini-satellites has failed in their attempt to deploy a kilometre-long tether in space. The setback means the low-cost Multi-Application Survivable Tether (MAST) experiment, launched on 17 April, may not achieve its goal of testing the survivability of a thin, braided tether in space. Over the past week, mission managers determined that the tether-deploying element, known as Ted, had properly separated from the tether inspector, a tiny satellite called Gadget. But a glitch in the restraint system kept Ted from pushing away hard enough to keep unreeling the tether from its spool. So the tether deployed just a few metres, rather than a full kilometre. Robert Hoyt, chief executive officer of Tethers Unlimited, which designed the picosatellites, says mission managers suspect they know what caused the glitch, but the company is not ready to disclose this to the public yet. "I don't think we'll ever know for sure," he says. Space tethers could one day be used to fling satellites into different orbits, thus saving satellite companies money on fuel. Or tethers could enable clusters of satellites to fly in formation and prevent them from drifting away from one another over time. Such an application might be useful in interferometry, where images from several telescopes, spaced some distance apart, are combined to give greater resolution. Some data Despite the setback, the MAST team at Tethers Unlimited, a company in Bothell, Washington, US, still may be able to get other data from Gadget to learn how a short tether behaves in microgravity. MAST team members discussed having Gadget crawl down the tether to Ted to try to restart the deployment, but they decided that option was too risky. "If we were to have Gadget start to crawl, there is the possibility of the satellites banging together, which would be very likely to damage solar cells and other systems," Hoyt says. This was not the first setback for the mission, which costs less than $1 million. After launch, the satellite team could not get a signal from Ted (see No signal yet heard from tether-deploying satellite). But they said that this should not have affected Ted's ability to deploy the tether. Longest tether Then, sky watchers who had been on the lookout for the deployed tether and satellites from the ground had not seen anything when MAST was scheduled to appear overhead. "That's one confirmation that the tether is not deployed to a very long length," Hoyt told New Scientist. In other space tether news, the longest planned space tether just got a little closer to launch. The satellite, a project of 500 students in Europe known as Young Engineers Satellite 2 (YES2), was shipped to its launch site in Russia from the Netherlands on 10 May. YES2, a project of the European Space Agency, is scheduled to launch in September. If everything goes as planned, the satellite will unroll a 30-kilometre-long tether that is a mere 0.5 millimetres thick. The end of the tether will be attached to a small round capsule called Fotino that will eventually re-enter Earth's atmosphere and attempt to land

Spooling is hard

[Animats]

Managing big spools of line is surprisingly difficult. Oceanographers run into this all the time, as they try to lower a few miles of line into the ocean. The textile industry runs into it when they try to use very large spools so they can run machinery longer without splicing. Designing something to unspool 30Km of line under near-zero tension in zero G is non-trivial.

Here's a discussion of spool winding, if you're really interested. There are even companies that specialize in spool winding.