What is stopping us from building a space elevator now?
There is an incentive for us to go into Spayse right?
>carbon fiber nanotubes
We have them, and we even have automated processes much like looms which produce them into threads. 3 years ago.
Loftstrom loops > momentum exchange tethers > space elevator
OP, pic related is the tallest building in the world in Dubai. Most first world countries can build something like taller than that with their capital. But they don't. Why? Because they don't need it. Even Japan and Korea aren't building anything like that.
Practically is a factor.
The reason we can't build one is because space elevators can't be rigid. You can't build them UP, you have to start with a structure in geostationary orbit and drop a cable or fibre DOWN.
A cable long enough to reach the Earth from geostationary orbit would be a gigantic payload; rocket propulsion simply can't transport that kind of load into space
Tl;dr: u need a space elevator to build a space elevator
It would be easier to grab a railgun and use it to launch satellites into space
just did it out, sqrt(GM/r+50km)=7876.286m/s at 50km altitude
i don't think any material can handle the punishment of wind, ISIS crashing planes into it, and the gravitational pull something like this is supposed to endure.
Reminder that engineering in zero gravity is pathetically easy.
Reminder that Lofstrom loops are efficient as fuck.
Reminder that we are quite literally burning starlight with our idleness.
Space elevators dont exist right now because we have no way/dont know how to make a Carbon nanotube tether longer than a few Centimeters.
No other material is known to hold the tensile strength needed to hold the weight of the cable and the elevators at sea levels. So yeah we know wht we need, just we arent there yet.
lol you think it would be one big cable?
holy fuck man.. how embarrassing
It would break if it's too thin.
What am I looking at?
So you would use a railgun to send stuff into space so you can build a space elevator to send stuff into space?
>It would break if it's too thin.
it would break at any thickness because it's the ratio between weight and strength that matters.
there is only 1 known material that does what is needed and we can't make more then a handful in length
This would actually work
A second golden age for Detroit, but with nanotubes instead of steel.
It requires stronger materials than we have. That's it. Last time I read about it, it was unclear whether or not carbon nanotubes could be used to make a strong enough material, or in fact whether it would be possible to make such a material at all, ever, out of anything.
There are some other unsolved problems, but no other problems that could not be overcome pretty quickly, I think, if we had a suitable material.
My understanding is that carbon nanotubes can only be made currently in very short lengths, although they can be intertwined to make a kind of rope they cannot yet produce a single endlessly long strand which is what you'd need to support a space elevator. That's what I heard at least.
It's all a matter of materials guys come on.
If we manage to find a way to manufacture cheaply the right material for the tether of the elevator then the rest is piece of cake.
Then we make space stations and huge spaceships to venture out into the unknown.
But people are busy making cellphones.
Why do we need an unbreakable material? Why can't we just pick a big mountain and start dumping all our garbage on top of it, eventually it'll get big enough to reach into space.
There's always this guy.
Much of what's important trancends money concerns. You think too much in terms of the paradigms of the last 500 years, that will eventually evolve beyond they're usefulness(in fact they've already proven dangerous as of last century.)
Fuck you, businessman.
Yeah man, why don't the workers, and engineers work for free for years on end for the transcendence of mankind? Why don't businesses give away billions of dollars of materials for the transcendence of mankind?
>A. fall under its own weight
I don't think you understand the concept of a space elevator, anon.
Have you seen all those space stations, moon bases, mars bases, huge spaceships that can sustain big human trips around the solar system?
Do you know what's the main technological obstacle stopping us from building them? The fact that we can't lift the material to build them in space.
A space elevator makes transporting tons and tons of materials and resources dirt cheap compared to rockets.
The sheer capital investment required for a project like will probably mean that it will never happen unless there's a real need for it. Even if the technology for it is made, you have to hope that we will run out of resources that can only otherwise be acquired in space before we can develop ways to efficiently recycle them, and that nobody develops a method of propulsion that's more economical than rockets to send things into space.
you more stupid then he is
a space lift works by being in geostationary orbit
fucking up the balance in any way would cause it to fall or fly away, depending on which part de-attached
Their orbits are constantly decaying, albeit slowly because of their immense speed, which can be corrected. In the case of the ISS they send up boosters every once and a while that dock with the station to raise it's altitude.
They are constantly falling to earth.
The amazing thing is that their horizontal speed is fast enough that they are literally always falling over the edge of the planet.
I think that's amazing
The only material strong enough to withstand the pull of gravity and the vacuum of space is theoretical forms of carbon nano-tubing which isn't viable to manufacture in large quantities.
The space elevator doesn't stay up because it's "falling over the edge of the earth". The top of it is moving so fast that it's outward centrifugal acceleration and it's inward gravitational weight balance out.
>Instead of gunpowder as a propellant, it uses electromagnetic pulses, and the projectiles hit with such overwhelming force that they don’t need to be armed with explosives.
Nigger, that's hardcore.
Also the footage of it just fucking blasting through like fucking 7 walls and still going strong.
It's hard to explain in words what happens exactly.
Just assume that there is a relation between centrifugal speed and downwards acceleration. Too much speed and you get launched to space. Too little and you fall back down.
Pic related, the downwards acceleration needs to be equal to upwards acceleration generated by speed.
Yeah that would be a funny thing to see. If we spend billions (or trillions) on making the space elevator and we make it just a little bit too long... and it rips out of the ground and off into space.
It probably shouldn't even be exactly beneath it. There are a lot of math and external factors to account for.
There are a lot of problems that would need to be tackled, yes. There would obviously need to be maintenance, but that would be waaay cheaper than our current system.
Uh, it depends on what you're saying. Yes, it won't keep it from being ripped out of the earth, but without it, there wouldn't be a centrifugal force to counteract the weight of it.
If what you're saying is that once you make the thing long enough that it's weight becomes negative, then I agree, the tether will do nothing to prevent it flying into space.
If you're building ground-up maybe, since it would face a lot of force from air at high speeds, but in a completed state it would be pulling up enough to prevent it from falling down.
That would be a fun couple of years, with all the news and shit that would be around, epoch making, even if it totally fucked up I'd be just as happy watching it all at home on the telly.
it would prevent it from twisting on it's own center of mass.
it does nothing to prevent it from flying away.
The force to counteract gravity.
It's not a real force but can be considered as such.
I thought you were at first but I'm having second thoughts. I'm beginning to think that the concept "falling around the earth" is the same thing as the massive angular velocity causing a centrifugal force that balances with the gravitational pull of the earth.
I am the guy that you actually asked, btw.
A 70 000 km series of superstrong ropes made from material that isn't invented yet(carbon nanotubes are not nearly as strong as required for space elev, not even close), build on a perfect equator and a place that would probably be politically neutral, most likely an artificial island in the pacific since there isn't much stable/neutral places on perfect equator, accounted for high altitude winds an, tidal gravitation waves, radiation damage, space debris including micro meteorites and micro asteroids.
And the only way to build this thing is to do it from top to bottom would require a massive counterweight on the "hanging" side, presumably made from an asteroid captured somewhere in asteroid belt, refined to be precise mass and shape for better stability that stretches the rope that goes down 70 000 km.
I would presume that the budget required to make this retarded shit possible would be as high as launching regular rockets at current price levels for about 20 years just to save pennies later.
Considering that rocket delivery systems are potentially cheap as fuck and the only reason for them being this expensive is government and private corporations shilling on their almost monopoly.
if the tether wasn't fastened to the ground, the find would blow it, causing it to slowly recoil. If it recoils then that shifts its centre of gravity outside of geostationary orbit and it will slowly drift into a higher orbit.
>"falling around the earth"
You're falling towards earth, it's just that your forward speed(perpendicular to earth) is so high that you won't lose altitude, thus "falling" forever
The part in the atmosphere would get pushed back relative to the top.
the issue is that low orbits have faster speeds then higher orbits, and the moment it's not tethered it would rotate around the CoM to do exactly this. The wind messes this up
Something would happen but the initial reaction would not cause the thing to fly away, maybe after.
You're not in orbit faggot
>as well as the entire atmosphere with it in it's rotation.
Only because of drag, and it's a pretty minor force. Atmosphere goes whatever direction it wants at any moment. It's the average movement that's probably following earths spin.
things in orbit are just like normal object falling to earth. they are simply moving very fast.
If there was no gravity on earth and no atmosphere and you shot a bullet from a gun horozontal to the ground, the bullet would keep going straight forever. And that means the bullet would slowly drift away from the surface of the earth because the earth is curved.
So now imagine we add a little gravity to this earth. There's enough gravity to pull the bullet back towards the earth as it travels. If there's enough gravity the bullet will fall to earth, if there's not enough it will fly away from the earth. If we add just the right amount of gravity the bullet will stay the same distance from the surface of the earth as it travels and do a perfect 360 around the planet. Unless we stop it, it will keep going. The bullet is now in "orbit".
This is how satellites work, but the have to be very high to be outside the atmosphere and they have to go very fast to not fall to earth faster than they are trending away from it.
There's no centrifugal forces. They are simply falling.
>There's no centrifugal forces
you're stating something that's technically right but very wrong to explain in this manner.
centrifugal forces are a easy way to describe circular movements
You are now aware that we would be launching things into space with giant cannons, if it weren't for the jews!
It's the tale of a simple man. A man with a simple dream. A dream.. of launching things into space using a fukcheug artillery piece.
I can understand all the practical reasons he was assassinated, but still...
people, supplies, satellites, etc.
the fuel and conditions needed to leave the atmosphere using propulsion are expensive and fleeting, and an elevator would make the process cheap.
i find it funny that you are this stupid. A literal 1 minute read on wikipedia would show you how one works
protip: its not even complicated and once mass production of carbon nanotubes begins it will be possible to make one
A couple thoughts from me, I don't know if they're intelligent ones or not but fuck it, this is an anonymous imageboard, not the NASA drawing room.
First, geostationary orbits tend to have a little wiggle; they do little figure eights in the sky. My worry would be what if the elevator started doing that too, and it created a harmonic oscillation? It would shake the thing apart or render it unusable until stabilized in some manner.
Secondly, would the moon's gravity affect it in any way? I understand the the moon is pretty far out from geostationary, and gravity decreases exponentially the further you get, but we're talking about a cable held in delicate equilibrium here.
But things in orbit _are_ like things being swung around in circles on the end of a rope. The tension in the rope is analogous to the force of gravity, and the orthogonal motion of the object keeping the rope taut is like orbital velocity.
On any planet with an atmosphere, you cannot put a small object in orbit with a gun on the surface alone. No matter how powerful the gun or what angle you shoot at, the starting position (barrel of the gun) will always be the lowest point of orbit (pericentre). In order not to fall into the atmosphere and collide with the planet due to air resistance, the object must somehow accelerate after it has left the atmosphere.
Anything that important to the space industry, with the ridiculous amount of effort that would have to go into building it, would probably make it a candidate for the most well protected structure on the planet.
The elevator would still be forced to endure extreme weather conditions near the bottom, and depending on whether there is tension in the elevator, that could be enough to send it into space.
Is there technical feasibility in constructing launchpads on the highest elevations of earth?
such as Chimborazo in Ecuador, we'd save ourselves from having to punch through 6km of atmosphere and gravity just like that
seems to be a far cheaper option than spess elevators
lazy ass people with a low budget are using carbon wafers to create carbon nano-tubes that are strong enough to make the space elevator using a fast method. We need a nano-molecular fabricator and can do the same thing just as fast. This ultimately is what is keeping us from the space elevator.
Doesn't fall under its own weight you fucking hill billy. the earth spins and because its so long, it gives it a force that counters gravity and gust of winds.
>My worry would be what if the elevator started doing that too, and it created a harmonic oscillation? It would shake the thing apart or render it unusable until stabilized in some manner.
This may be less of a problem than it seems.
>Secondly, would the moon's gravity affect it in any way?
Yes, but this is also somewhat less of a problem than it seems, for the same reason:
The elevators, as the climb and descend, would be constantly changing the frequency it "wants" to oscillate anyway, and it would not be too difficult to tune it by a change in speed or mass of the payload. I could even envision a scenario where you might have several elevators climbing at once at different rates, speeding up and slowing down to manage the amount of oscillation.
Also, the length of the tether between the top station and the counterweight would have to be adjustable anyway, either by allowing it to move further out or by pulling it in to make sure that the center of mass for the entire system stays in a geostationary orbit.
if a cable the length of the earth circumference is strong enough to hold itself in tension along it's entire length, then a little wind is along 0.4% of it's length isn't going to matter too much.
Nah, because once you got an AI all of his robot assholes start fucking the station, and then engineering is too goddamned busy with maintaining the singularity, so the assistants and cargosia come to help but get cockblocked by shitcurity and then get held up in containment while the whole station goes to hell.
God. He said that the old people of the Earth tried to make a tower to reach Heaven, and he diversed their language so that they couldn't do it. He must be hiding things in Heaven, so yeah.