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First Controllable Solar Sail Launched Today
clustermonkey writes "The first controllable solar sail was launched earlier today from a Russian sub in the Barents Sea. The Planetary Society, founded by Carl Sagan, organized the project and were funded by Cosmos Studios, founded by Sagan's widow. There have been 2 other solar sail deployments by others, but this will be the first to attempt controlled flight. The sail is scheduled to deploy June 25." All may not be well, though: Snot Locker writes "The Cosmos 1 Weblog is showing that, although the launch initially looked successful, they can't seem to find it or hear it. Bummer. Previous Slashdot coverage on the Cosmos 1 Solar Sail mission can be found here."
I swear I remember this happening before.
here
In short, at 83rd second engine stopped working for unknown reason, and the whole thing is currently being intensively searched for. Probably Russian ICBMs are not so good for launching satellites after all.
I wonder how well this kind of propulsion will work in interestellar space where there is no solar wind, let alone enough protons from one direction.
... coast ... -Pushx0.01 + -Pushx0.02 + -Pushx0.03 + -Pushx0.04 + -Pushx5 + -Pushx6 and you're there.
Let's visualize someone on a bike. They stand at the top of a hill (solar radiation effect, closer to the sun, more there is). They peddle enough to get going (ion drive or solar sail). Then they pick up speed rapidly as they go down the hill.
Once they reach the bottom of the hill, where there isn't enough material to push them they fold up the sail - or in our bike version, they let the mechanism keep them moving forward.
During this time the sail is folded - like the biker bent forward to lower wind resistance. As they approach the destination, based on speed, solar radiation - or for a bike, based on how steep and high the next hill is - they eventually unfurl the sail.
Pushx5 + Pushx4 + Pushx3 + Pushx2 + Pushx1
The advantage over a bike is that as you go up the hill (into the solar radiation), you get pulled in by gravity and since your sails are collapsed there is not much push back.
Simple.
Yes, I know it's not linear, I'm just trying to help you visualize it. We can deal with the space-time continuum effects another time as well.
-- Tigger warning: This post may contain tiggers! --
You forgot one step:
Lastly, the solar wind will shred the sails of this craft, as we have not yet developed a material light enough for solar sails, yet robust enough to withstand long-term exposure to the solar wind.
Still perfectly valid for proof-of-concept, but a good long way from practical application.
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~ |rip/\/\aster /\/\onkey
If you want to know what the people organizing the mission are thinking, the Planetary Society's Latest Update section is a good spot to go. As it stands, the following has been stated:
* The signal didn't dissapear suddenly when the kick fired - it became irregular, and then dissapeared after three minutes.
* The signal was received clearly after launch for six minutes.
* There were irregular readings coming from the Volna; however, clearly the craft detached, or there wouldn't have been six minutes of signal.
* STRATCOM can't find the satellite. That doesn't mean that it's gone - only that it's not where they told them to look. Likewise, the lack of ground station reception could mean the same thing. It could be in the wrong orbit, which is actually a more common phenominon than a total craft loss.
* The chance of signal acquisition at the early two stations was only considered marginal to begin with. The big test will be at the permanent stations in Paska Ves, and especially the Tarusa and Bear lakes.
* Not receiving a signal from a spacecraft during the first few orbits is "not extremely unusual". Nonetheless, they do sound a bit nervous.
The War of 1812... the good 'ol days when the federal government actually tried to save New Orleans.
Solar sails aren't driven by solar wind or protons, they are driven by light (photons).
An interstellar voyage might be possible, but would probably require a laser or microwave system aimed at the sail for much of its journey (a brief "push" like that is also being tested as part of this experiment).
The report of data suddenly looking "noisy" about the time the final stage fired is a pretty classic bad news situation. The sequence is usually: "looking good!" "clean separation!" "5-4-3-2-1,kick motor ignition" data lost followed by, a short time later "radar indicates multiple targets..." Not that I am hoping, but it's a really bad sign. Brett
Spaceflight Now has posted a story about the launch. The 1st stage failed after 83 seconds.
What happens if you can only shed half your speed by the time you get to the planet?
Quite simply, you enter orbit.