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It would be nice to accelerate at one G. Then accelerate half way to destination then decelerate the other half.It may be completely unreachable, but what if all the loose atoms and ions could be gathered in from frontward and released as pure energy for propulsion?Maybe a good angle for SF.

Pardom my abominable math skills. But I assume the speed of 2.2 miles per second may simpy be multiplied by 10 for 22 miles per second after ten hours? I get about 19,000 mps after one year.One G is ten times that = 190,000 mps, if you set aside mass dialation. We established earlier that time dialation of 50% would only require 86% the speed of light. Assuming starship with nuclear reactor, I just wonder how much mass would be need to be carried on board to push out the back!Theoretically, if you are generating 1G by squirting mass out the back of your ship, then your mass will decrease as you speed up, perhaps offsetting mass dialation? At 86% speed of light the starship travelor is aging one half the speed as those who sent him on his way. In effect, he observes himself traveling FASTER then the speed of light.Setting asside one year of acceleration, the travelor would traverse about eight light years distance from us in ten years of travel, but experience only five years of aging.