At the g-force a human body can withstand, how long would it take to reach lightspeed?
I tried a calculation and came up with just under 71 days at 5gs. I am not the least bit confident in my calculations. I am also not sure a human could withstand a 5 g-force for extended periods of time without causing severe damage.
I find this all fascinating. I hope to see it happen in reality before I take my dirt nap.
“At the g-force a human body can withstand, how long would it take to reach lightspeed?”
The answer is: infinity. You can’t accelerate to light speed no matter how many gs your body could take.
There are lots of discussions about building spaceships which accelerate at just one G (or less), and approach light speed in a reasonable time. Problem seems how much fuel is required to maintain that acceleration that long; remember, it takes rockets a starting load of around a million pounds of fuel just to push a few G for a few minutes. After that first push, spacecraft just coast (taking clever advantage of orbital/gravity mechanics for further acceleration).