How fast can a ship travel at 525 gravities in space?

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Discussion Overview

The discussion revolves around the hypothetical acceleration of a spaceship at 525 gravities, as referenced in the science fiction series "The Honor Harrington." Participants explore the implications of such acceleration in terms of speed and distance traveled over time, while also considering the physical effects on humans and the relativity of time experienced by occupants of the ship.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant notes that 525 gravities translates to approximately 15,000 feet per second squared, leading to calculations suggesting speeds exceeding the speed of light after one hour and one day, which raises questions about the feasibility of such acceleration.
  • Another participant emphasizes the extreme physical toll on humans, stating that such acceleration would be lethal, likening it to an explosion.
  • Some participants mention the concept of inertial compensators in science fiction, suggesting that these devices could mitigate the effects of high acceleration on occupants.
  • Discussion includes the idea that a ship accelerating at 525 gravities would experience relativistic effects, with a round trip of 20 light years taking about 40 years from an external frame of reference, while occupants would experience only days to weeks.
  • A reference to Joe Haldeman's "The Forever War" is made, highlighting the challenges of relativistic travel and its impact on relationships and time perception.

Areas of Agreement / Disagreement

Participants express a range of views on the implications of high acceleration, with some agreeing on the physical impossibility for humans to survive such conditions, while others explore the fictional technologies that might allow for such travel. The discussion remains unresolved regarding the practicalities of achieving and surviving such speeds.

Contextual Notes

Limitations include assumptions about the effects of acceleration on human physiology and the speculative nature of technologies like inertial compensators. The calculations presented are based on theoretical physics and do not account for relativistic constraints in a definitive manner.

glondor
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I am reading " The Honor Harrington series" by author David Weber. It is pretty cool scifi with some intricate plots and massive space battles. Thru these books the refrence used for speed has always eluded me in a "frame of refrence" sence. The ships have "accelerations" refrences in gravities. If a ship were to accelerate at 525 gravities, How fast is this? How far will it travel in an hour? a day? I have tried to sus this out but I don't have the math skills for it i guess. Any help would be appreciated
Thanks!
 
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glondor said:
I am reading " The Honor Harrington series" by author David Weber. It is pretty cool scifi with some intricate plots and massive space battles. Thru these books the refrence used for speed has always eluded me in a "frame of refrence" sence. The ships have "accelerations" refrences in gravities. If a ship were to accelerate at 525 gravities, How fast is this? How far will it travel in an hour? a day? I have tried to sus this out but I don't have the math skills for it i guess. Any help would be appreciated
Thanks!
1 (earth) gravity is roughly 32 feet per second per second. 525 gravities would be around 15000 feet per second per second. That is roughly 3 miles per second per second. The formula for velocity is v = a times t, where v is velocity, a is the acceleration and t is the time. At that rate of acceleration, starting from rest, it would be going:
roughly 10000 miles / second at the end of 1 hour
roughly 240000 miles / second at the end of 1 day. That's faster than the speed of light, so that couldn't actually happen.
Any humans in the ship would be crushed. The last thing to go through their minds would be the heels of their feet.
 
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Humans can only withstand several gravities (or g's) before passing out, and only a few more g's and you're dead.

500 would be something like an explosion right next to you. Maybe even worse.
 
Ok thanks. That is really really fast. Of course it is scifi. They have inertial compensators to deal with the splat factor. fwiw this is the slow mode of their ships. When they are in the Hyper bands they can cover 37 lightyears in 5 days...lol I love science fiction!
 
Yes, collisions are measured in hundreds or thousands of g's. So a ship that accelerates at 525g's would effectively be colliding with a planet continuously for an hour or a day.
 
The upshot of this acceleration is that the ship will very rapidly reach within a very large fraction of c (and getting closer all the time) and spend almost the entire trip there.

At this speed, a trip of 20 light years will take, like, 20 years + 1 day (or more rigorosly, a round-tip of 20 light years will take about 40 years + 2 days) from an external frame of reference.

Note that no amount of acceleration will shorten the duration of the trip from an external frame of reference to less than 40 years.

However the occupants will only experience a VERY short passage of time - something on the order of days to weeks.

But every time they took a vacation on Gliese 581c and came back, the Earth would be 40 years older!
 
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If you really want to see what relativistic travel can do, read Joe Haldeman's 'The Forever War'.

How do you cope with returning to an Earth that's a thousand years older than when you left? And how do you keep a relationship together when your partner isn't coming home for another two lifetimes?

Of course, it's actually about a war, so lot's of battlesuit infantry stuff.
 

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