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Question Solar sail acceleration

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Nov 18, 2021
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I don't think that hundreds of large solar reflectors that can then focus sunlight on a solar sail spacecraft will work because the metal will burn up really fast if that's what they would be used for. And plus it wouldn't work because we don't have metal that works for us and the sun is too powerful.
 
Dec 3, 2021
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I don't think that hundreds of large solar reflectors that can then focus sunlight on a solar sail spacecraft will work because the metal will burn up really fast if that's what they would be used for. And plus it wouldn't work because we don't have metal that works for us and the sun is too powerful.
While this would be a problem right now, by the time we are sending probes out of the solar system, we will probably have far stronger and lighter alloys, and the only real problem will be light refraction, which would be solved with lazers.
 
Apr 5, 2021
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May be the sun's gravity could be used as well by swinging probe around it to build up speed. Later firing small thrusters to free itself this orbit in a specific direction. Just look at how fast Parker probe is currently flying.
 
Nov 19, 2021
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May be the sun's gravity could be used as well by swinging probe around it to build up speed. Later firing small thrusters to free itself this orbit in a specific direction. Just look at how fast Parker probe is currently flying.
The Parker probe is going fast only by virtue of how far down the Sun's gravity well it has fallen. It will lose the same amount of speed as it exits the well, with no net gain.
A probe can use any of the planets orbiting the Sun to gain speed and thus exit the Solar System, but not the Sun itself. A probe interacting with the Sun is a "two body" problem. No two body interaction can eject one of the two. A "three body " problem is required such as interacting with a planet that is going around the Sun.
 
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Dec 5, 2021
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Would it be interesting to boost a solar sail spacecraft ,
so that it accelerate more,
by using mega-large mirrors in space
to reflect more sunlight to it?



MagI
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Jun 3, 2020
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Reflecting material / more = more weight = more weight = more heat
more heat means more degradation = failure Z
\\
 
Nov 19, 2021
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Any space mirror designed to accelerate an insterstallar vehicle does not need to be made of anything better than Kapton. In solar orbit, kapon lasts probably thousands of years. The boost we need to give to the space ship puts it going so incredibly fast that it is very soon out of sight. There is a proposal in the funding system called Breakthrough Starshot that propels with a bunch of ground based lasers an amount of light roughly equal to current world production capacity boosted by capacitors. The star ships weigh in at one gram and have a large solar sail. Millions would be launched hoping at least one will make it to the next star, and radio us back here at home. When the initial laser blast goes off and starts pushing them, they are out of laser range in ten seconds. The amount a laser spreads its signal is helped by going to shorter wavelengths and wider sources and they will take every advantage of all of that and still, after ten seconds, the ship is pretty much gone. Simple solar reflectors can't even do that well.
The proposed acceleration is 10,000 g for ten seconds. This would put the velocity, after one second, to be 1,000 kilometers per second and its distance 5,000 kilometers, by the end of the first day it is half way to the Sun.
 
Last edited:
Dec 3, 2021
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Any space mirror designed to accelerate an insterstallar vehicle does not need to be made of anything better than Kapton. In solar orbit, kapon lasts probably thousands of years. The boost we need to give to the space ship puts it going so incredibly fast that it is very soon out of sight. There is a proposal in the funding system called Breathrough Starshot that propels with a bunch of ground based lasers an amount of light roughly equal to current world production capacity boosted by capacitors. The star ships weigh in at one gram and have a large solar sail. Millions would be launched hoping at least one will make it to the next star, and radio us back here at home. When the initial laser blast goes off and starts pushing them, they are out of laser range in ten seconds. The amount a laser spreads its signal is helped by going to shorter wavelengths and wider sources and they will take every advantage of all of that and still, after ten seconds, the ship is pretty much gone. Simple solar reflectors can't even do that well.
The proposed acceleration is 10,000 g for ten seconds. This would put the velocity, after one second, to be 1,000 kilometers per second and its distance 5,000 kilometers, by the end of the first day, it is half way to the Sun.
*Eurobeat starts playing in background*
 

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