Max. G-Force

[ThomasR]

Anybody know what the max continuous G-Force the human body can withstand? Traveling at that continuous rate of acceleration how long would it take to reach the speed of light 186,287 mps [300,000 kps]? NASA latest space propulsion research project is photon collector sails. New research also on neutron generator capable of reversing polarity of an electro-magnetic field there by eliminating effects of acceleration.

 

[jackotron]

Traveling at that continuous rate of acceleration how long would it take to reach the speed of light 186,287 mps [300,000 kps]?

What is the continuous rate? Am I accelerating in a 747 or my brother-inlaws Chev Celebrity? Crucial data.

 

[VaB]

I don't know, but Han and Chewy did it pretty quick.

 

[Airpiraterob]

wow....i believe 25mph per second is 1g....and 6G's without a G-suit would be something like 150mph per second acceleration....so 186000mi/s is speed of light right?..umm....21 minutes i think....but regardless, this is purely impossible. einstein is BS i think....i mean its not a law yet and scientists were arong about the effects of going the speed of sound....i have enough trouble dealing with the speed of Beer.

assuming youre able to go the speed of light. do you know what the impact of a grain of sand would be at that speed? what is it....force=mass x velocity?...so if the velocity is 669,600,000 mph,...and the grain of sand/silica/particle of rock weighs a tenth of a gram....then youd have a massive collision and a tiny hole through your entire spaceship....and whatever else is inside...and with billions and billions (sagan) of particles out there....the ship would be sandblasted in short order if not eroded into nothing.....assuming you could keep up the speed.

I would hold out for the overhead cam Space folding engine.
but we all saw Event Horizon right? people go insane using that thing.

i didnt spend all those hours watching science fiction and not learn alot about quantum theory and starship design.

 

[Khirsah]

Going with Airpiraterob's 6g it would take about 63 days to reach the speed of light.

9.1 m/s^2 * 6 = 54.6 m/s^2

300 million m/s / 54.6 m/s^2 = 5.5 million seconds, give or take. 86,400 seconds in a day. Between 63 and 64 days.

Anyone want to pull 6G for 2 months straight? Sounds like a blast!

 

[Jedi_Cheese]

Gs are a measurement of acceleration. Acceleration is measured in distance/(time*time). MPH is a a velocity measurement. Velocity is distance/time.

I think the max sustained Gs the human body can take is something like 3Gs. A G is 9.8 meters per second squared.

 

[Khirsah]

gadblastit, Jedi, you're right on the 9.8 m/s^2


And I did all that pretty math, too.


Lets hope I can get rid of that nasty habit before I begin my career.
"Captain, with the increased headwinds it looks like we're still good on fuel to get to Chicago."
"Great! Now figure it out for the extra 200 miles to Cincinnati, which is where we're going."

 

[turpentyine]

wow....i believe 25mph per second is 1g....and 6G's without a G-suit would be something like 150mph per second acceleration....so 186000mi/s is speed of light right?..umm....21 minutes i think....but regardless, this is purely impossible. einstein is BS i think....i mean its not a law yet and scientists were arong about the effects of going the speed of sound....i have enough trouble dealing with the speed of Beer.

assuming youre able to go the speed of light. do you know what the impact of a grain of sand would be at that speed? what is it....force=mass x velocity?...so if the velocity is 669,600,000 mph,...and the grain of sand/silica/particle of rock weighs a tenth of a gram....then youd have a massive collision and a tiny hole through your entire spaceship....and whatever else is inside...and with billions and billions (sagan) of particles out there....the ship would be sandblasted in short order if not eroded into nothing.....assuming you could keep up the speed.

I would hold out for the overhead cam Space folding engine.
but we all saw Event Horizon right? people go insane using that thing.

i didnt spend all those hours watching science fiction and not learn alot about quantum theory and starship design.

wow event horizon i loved that movie. scared the crap out of me. that chik with no eyes, and its 2:34am here. now i am gona go to sleep and ill be thinking bout that movie. thanks a lot hehe. I wonder y it wasnt that popular

 

[ThomasR]

Cassini probes Saturn. I think we are getting pretty good at this probing.

 

[FracCapt]

i have enough trouble dealing with the speed of Beer.

That's pathetic. And you call yourself a pilot? You apparently need remedial training. Go. Now. Practice. Don't come back here until you can pound a 12 pack in under 10 minutes. Then you can begin the REAL training.

 

[EagleRJ]

If you believe Einstein, reaching the speed of light is impossible, at least in the conventional sense. As you approach light speed, the mass of the spacecraft starts to increase, and at the speed of light, the mass is infinite, which would require an infinitely powerful engine to push. Even your BBQ sauce/antimatter drive isn't going to cut it. Time slows down, too, so reaching light speed would require an infinite amount of fuel, too. (but if you're using BBQ sauce as fuel, at least there's a silver lining in that cloud!)

Solar sails are an intriguing idea, but they have huge limitations. Sci-fi films are full of vehicles using solar sails to carry people around. The sail usually look like they are around 100m x 100m. In reality, they would need to be on the order of 50km x 50km, and the rate of acceleration would be tiny. Acceleration would let off, the farther away from the sun you got, since the pressure of the solar wind is less.

Our best hope for powerful propulsion lies with advanced ion drives, that use nuclear/electric power to accelerate a lightweight gas like xenon. The systems could be refueled with gas mined from other planets, too.

 

[Axel]

what is it....force=mass x velocity?

Actually, Force = Mass x Acceleration- F=MA (thank you Fielding McGehee) Deriving the equation, Kinetic Energy then= 1/2 the mass X the SQUARE of the velocity.

KE=1/2 [(MV)(MV)] Sorry, couldn't make the exponent for "squared" look right.

The KE rises linearly with the mass, but exponentially with the velocity

Remember particle beam weapons? Theoretically, subatomic particles of infinitesimal mass accelerated to velocities approaching C were to destroy missiles in flight.

I love sci-fi.

 

[johnpeace]

assuming youre able to go the speed of light. do you know what the impact of a grain of sand would be at that speed? what is it....force=mass x velocity?...so if the velocity is 669,600,000 mph,...and the grain of sand/silica/particle of rock weighs a tenth of a gram....then youd have a massive collision and a tiny hole through your entire spaceship....and whatever else is inside...and with billions and billions (sagan) of particles out there....the ship would be sandblasted in short order if not eroded into nothing.....assuming you could keep up the speed.

I guess I always assumed that along with the technology to accelerate to such velocities, one would develop technology to solve the particle collision problems.

Like a magnetic field surrounding the vessel that, being charged opposite the particles, would scoot them out of the way as the vessel approached.

I don't have it all figured out yet, just some sketches on napkins...working on getting a patent.

 

[Axel]

A magnetic field "scoop" preceeding the vessel to funnel the particles into the ion drive. The major hurdle is figuring out how to get anything to preceed a vessel going the speed of light.

186000 miles/second: it's not just a limit. It's the law.

 

[ThomasR]

...............186000 miles/second: it's not just a limit. It's the law.

Well, I'm not so sure. The speed of light has been kinda exceeded. Accelerated particles in a cyclotron have been bumped past the light barrier. Sci-fi depict it as an event happening as part of a cause and effect where the effect happens before the cause.

In real testing the particle disappears and at a measurable distance along its trajectory another particle appears. The lapse in time between the two events exceeds the light speed. Evidence of this happening regularly with atomic particles on the sun make it a normal phenomena. It is called a quantum jump that allows particles locked within "strong electro magnetic force" fields to escape. If the phenomena did not happen the fusion process would bog down and die. The quantum jump allows particles to continue their paths of collision regenerating the process.

No one knows yet where the particle goes when it disappears and if it is, in fact, the same particle when it reappears. There is some conjecture regarding String Theory that seems to be an interplay but I haven't read that far yet.

Einstein was a great physicist and a philosopher and one of his quotes was:​

​

"The only thing I am sure about, is that I can not be sure about anything."

​

 

[Immelman]

So if you were able to accelerate your body to v=C..... would "you" (your concious mind) ever get there? Trippy dude.

(think time dilation)

 

[rvsm410]

So in reality it wouls probaly take many months to get up to speed but could you imagine how long it would take to slow down! Talk about preplanning a let down and approach! Geez, it may take several million miles and over a year to do it, talking about busting your flight time limits......

 

[ThomasR]

I don't know but if time slows as you near light speeds and you had instruments that could take readings of material traveling at light speeds you could get data of any place. Aim for the event horizon of a black hole and reverse your trajectory back; Time elapse would be close to zero. It wouldn't even have to be manned, a probe would be best, less mass, no on-board environment to contend with, unlimited time table (compared to a human component).

As good as we are getting at building computers with fuzzy logic we would not even have to deal with earth based control or guidance.

 

[LAXSaabdude]

???

African or European?

LAXSaabdude.

 

[7B2]

WOW!!!!

This isn't easy reading after a few beers.

But it does bring up another question.
How do you navigate at the speed of light?

And what if you have a few of those "ships" flying around at those speeds; how does your TCAS work?
Hmm, I remember myself asking similar questions when flying a C-152 looking at a Piper Arrow..