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[Next Big Future] Carbon nanotube sheets for solar sails for 5.6% of lightspeed - Page 2

post #11 of 42
It would take years to get there now, i don't think you comprehend how fast 5.6% of light speed is, at its shortest length it would take around and hour once your in space and out of the atmosphere.
It ok to post, just don't spew stupid.
post #12 of 42
Thread Starter 
Quote:
Originally Posted by Liranan View Post

None of this technology will get us anywhere. 5.6% Of speed of light is still years to Mars, let alone the nearest stars. Work on warp drives and wormholes needs to be sped up, but I suppose self annihilation is a far more worthy cause.

Try and at least seem like you checked your facts before you post non-sense.
Check Andy's post for ACTUAL numbers.
Quote:
Originally Posted by AndyM95 View Post

It would take roughly 55 minutes to get from Earth to Mars at 5.6% the speed of light, assuming the distance between them is at the shortest point...
"None of this technology will get us anywhere" my ass.

Thank you for actually giving it some thought other then just shrugging something off:thumb:
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post #13 of 42
Quote:
Originally Posted by Liranan View Post

None of this technology will get us anywhere. 5.6% Of speed of light is still years to Mars, let alone the nearest stars. Work on warp drives and wormholes needs to be sped up, but I suppose self annihilation is a far more worthy cause.

You have to learn to crawl before you can win an olympic gold medal in ice skating. One step at a time there champ.

(And as stated, 5.6% of light speed is still really fast and gets you quickly to mars)
    
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post #14 of 42
Quote:
Originally Posted by Tippy View Post

So I guess people are really dedicated to solar sails now as the best method of creating the fastest ships possible. There was that whole hub-bub about Ion Drives but nothing practical has been built with that in mind...yet tongue.gif

VASIMR

Blame a lack of funding if anything.
Quote:
Originally Posted by Blameless View Post

5.6% of lightspeed would be fast enough to get a probe to the nearest star in less than a century. Pretty impressive.
Uhh?

Ion drives were first demonstrated in the early 1960s and have been routinely used on actual spacecraft for decades.

You spelled 1916 wrong. Ion drives are older than most think. The theory of light pressure is really old and the idea of solar sails were around in the late 19th century but solar sails themselves actually didn't come into being until the 1970's I think so maybe you get the two mixed up.
Quote:
Originally Posted by Liranan View Post

None of this technology will get us anywhere. 5.6% Of speed of light is still years to Mars, let alone the nearest stars. Work on warp drives and wormholes needs to be sped up, but I suppose self annihilation is a far more worthy cause.

lol. The VX-200 (built and tested on Earth) is capable of a top speed of over 6 times that of the Space Shuttle (7.77 km/s) in orbit thanks to exhaust gas at 50 km/s. 5.6% of light speed is over 335 times faster than the VX-200 engine /at 16,788 km/s or over 2,152 times faster than the Space Shuttle. The difference is that the Space Shuttle hits its top speed quicker.

VASIMR is essentially limited by power sources at the moment while solar sails are still unproven. There are also other ion thrusters like the NEXT using xenon but it seems like VASIMR is the furthest along as well as the most applicable to manned transport and hauling.
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post #15 of 42
Quote:
Originally Posted by Sealz View Post

It would take years to get there now, i don't think you comprehend how fast 5.6% of light speed is, at its shortest length it would take around and hour once your in space and out of the atmosphere.
It ok to post, just don't spew stupid.

Actually at our current tech level it would take about 6 months for a normal trip to Mars under ideal circumstances.
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post #16 of 42
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post #17 of 42
Quote:
Originally Posted by Kirmie View Post

You spelled 1916 wrong. Ion drives are older than most think.

Indeed, but no one put one on a spacecraft till 1964.
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post #18 of 42
Problem with nano-sails is the massive surface needed. Even @ .27mg per sq.m (which is insane already!) Remeber tho, that this has to be supported: the sail will be pulling "hard" - even if it's weight is negligible, all the rigging/stays etc that will be needed to support, control it and transfer these powers back to the vessel will have to be bigger and bulkier.

I guess by the time a solar sail will be deploy-able, we will have memory alloys/composites and bio-mimic technologies that will make it easier to micro-manage it, but in the macro scale we will still be dealing with a structure that rivals in area that of some small countries.
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post #19 of 42
what ever happened to the vasimr plasma rocket? surely that would be more than 5x faster than a solar sail?
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post #20 of 42
God this talk about space travel is making me excited in an inappropriate way!

Ion drives, solar sails, plasma drives. Don't stop baby!




Seriously though, we are light years ahead of where we were in the 1960s when we first started shooting men to the moon. For long term flights I think top speed might be more important than acceleration. For short flights to the moon I think acceleration probably is key there.
 
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