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There is an experiment which involves levitating a frog, and I'm guessing that it applies a force fairly evenly through the whole frog. Perhaps something like that, only a lot stronger, could be used to prevent a person from being squashed flat by acceleration forces and allow them to reach speeds close to the speed of light in an instant. I don't know if the application of such a levitation force would do damage to a person in itself though.
There is a trick by which it's theoretically possible to accelerate at over 1000m/s^2, while experiencing only 1g.Basically, you have to pack a flat disk in the nosecone of your vehicle with very dense material (black holes for example), and then adjust the crews position relative to that to nearly match the vehicle acceleration.
Quote from: wolfekeeper on 19/09/2012 03:14:06There is a trick by which it's theoretically possible to accelerate at over 1000m/s^2, while experiencing only 1g.Basically, you have to pack a flat disk in the nosecone of your vehicle with very dense material (black holes for example), and then adjust the crews position relative to that to nearly match the vehicle acceleration.Unfortunately, your nosecone mass would have to be many times greater than the mass of Earth, and you would need an engine powerful enough to accelerate that mass at over 1000 m/s^2.
Also, the gradient of gravity near that mass would be so great that it would tear the person apart with tidal force.
The first question is how great of acceleration could a person withstand and survive with adequate pressure suits and other devices.Humans loose consciousness with an acceleration of about 9 or 10G.Somewhere around 65Gs is considered fatal for an impact (which is of short duration).For my calculations, I tend like to take 100Gs, or about 100*10m/s2, or 1000m/s2 in optimum conditions. This may in fact be a gross overestimate as a person may be able to survive such high forces with adequate protection for a brief period, but not for an extended period. But, perhaps one could ramp up the acceleration so it would not be quite the same as an impact event.The speed of light is about 300,000,000 m/s.You can simply divide the speed of light by your acceleration, (300,000,000 m/s) / (1000m/s2), and one gets 300,000 seconds, and one gets about 83 hours of acceleration to reach the speed of light (or thereabouts).If you limited your acceleration to 10G's, or about 100 m/s2, then one gets 3,000,000 seconds, or about 35 days to reach the speed of light (or thereabouts).Here I calculated that if one put a tunnel through the center of the moon, and an electromagnetic accelerator in the tunnel capable of constant acceleration, then after about 83 seconds of 100G acceleration, one would blast out of the other side of the moon at about 42km/s, or around 1/10,000th the speed of light.
What if you accelerate by 1 G and allow the speed to remain constant, and there by reach equilibrium. Then, accelerate once more by 1G, and thereby technically you'd be at 2 G, but would experience 1G acceleration. Assuming all changes to acceleration are this way, would it be possible to withstand fatal G levels if you experience change in this way?
You would do so while orbiting earth from some distance and then drop a person into the ship when it is traveling at near the speed of light, or even say 75% of that speed. (I know this doesn't exactly answer the original question but there's no need to propel the person via this method)
LOL like a bug on a windshield....or (more likely) like an atomic bomb exploding...I calculate a 70kg human would explode with the equivalent of 850 Megatons of TNT if they were instantly accelerated to 75% of lightspeed.