Cassel

Now I have even more questions and doubts. The idea of a train traveling on the cable is nice, but if this train will move quickly and will be heavy, what about the centrifugal force and the forces applied on the cable? At this point, it will no longer be a cable just train tracks in orbit. The train would have to move around 26,000 km / h? What will power it? Edit: I omitted one thing here. If the train moves at zero speed in relation to the Earth, does it mean that it will be falling and pulling the cable behind it? Changing the speed of the cable involves a change in its length. At 300 km, the cable will have to have a different length than at 400 km, right? The very process of attaching an orbiting cable to the planet and spinning it faster will require many stations and unprecedented coordination in places thousands of miles away on the surface of the planet. For this you need to read the data from the sensors on orbit on the cable. Cable itself at that moment would be loaded and exposed to tearing. The forces acting on the cable would be huge. You need a lot of trains running on the cable, each of them needs power. Each train has to pull the "docking cable" with the planet. On the surface of the planet, you need stations designed for attaching holders. They are much simpler and such elevators can operate independently. In your idea, any acceleration of the cargo pulled from the surface of the planet requires the coordination of each train moving on the cable. If the cosmic elevator breaks down and the cable breaks, should it fall vertically down? Additional security devices can also be mounted on such a cable, for example a system that when the break is detected will start the engines and throw the falling part of the cable into a higher orbit. Alternatively, drones may circulate between GSO and 400 km, which will catch falling pieces of cable at the moment of failure. If the cable from your idea breaks, will it fly to Earth at 26,000 km / h? This can cut down every skyscraper on its way from the top to the basement? Well, we also have a trains that are falling and crashing on Earth. The cable cracked in half will act like a whip of 40,000km length? One part of it will start to fall to Earth, and the other end can change orbit and cut in half any satellite within range or I am missing something?

Steel cable moving... how fast exactly in atmosphere? :-) I see few problems, like I said what if cable breaks and falls on city? There is no way to prevent that. If it is only on 300km it will lose speed over time like ISS?

But you need this ring at 400+km? What makes it larger and you still need cable to reach Earth. What would happen if part of cable would snap and fall on city?

This is because you do not understand the military way of thinking, the range is more important than anything that seems important to you. https://www.quora.com/What-was-the-thinking-behind-the-external-fuel-tanks-on-the-T-34

As soon as the engines are created, they will be applied to the next generation of fighters and bombers, which will give the manufacturer huge funds for the development of engines and aircraft for the private sector.

How long does the check-in at the airport of an ordinary plane (loading of luggage and boarding passengers) take? Boarding on the ship will take about 1 hour or more? Travel by ship how long it can take, ships are slow as far as I know? Reloading luggage and transfer of passengers from ship to rocket's, how long can it take? After a 30-minute rocket flight, the same as above only in the reverse order. I would say it will take over 5 hours for a not-so-pleasant journey, as already mentioned by somebody large g-force. A manned version of Skylon will be made sooner and will be better for public transport than this kind of BFR use.

This is something wonderful, I hope the experiment will succeed. Even if they did not manage to achieve materials of such strength that pulling the capsule from Earth into orbit would be possible, I hope they could at least build an elevator on the Moon or Mars. https://www.space.com/41278-japan-space-elevator-cubesats-experiment.html

First of all I write about the basic game, I do not want any additions. Secondly, I want a cabin for a ground vehicle, it may have built-in lights and a ladder, it must also have a side door so that the driver can leave. I know that you can use any cabin, but the lander's can not be used because of a badly positioned door. And the pilot's cabins give a view of the sky, not the ground. Both are heavy and have an unnecessary fuel tank that could be replaced in the vehicle's cabin by an additional battery or a built-in solar panel.

I wonder when we get stock parts (cabin and wheels), so proportional and designed for planetary exploration. Cabin could have build-in lights and ladder, like new capsule has build-in RCS. https://imgur.com/gallery/Z6SQc

It seems to me that the costs of antennas are too low. In the case of long-range antennas, this is at least an order of magnitude too small. HG-5 3,000$ RA-2 9,000$ RA-15 15,000$ RA-100 30,000$ seems better :-)

This is more realistic concept

I found this, different use of cylinders, hope it adds something ;-)

I not sure about this. Lockheed Martin built the Stirling engine, they called it an advanced Stirling radioisotope generator. It generates 130W and weights 32kg. How much solar panels would weight?

There was video with that solution, I think it was Constellation mission.

It seems to me that two connections are not necessary. The cylindrical design gives you a huge space that is always lacking in space ships. Why can not he maneuver? If you want to fly far, you need something bigger than the space shuttle. For what, a ship for trips lasting several months, needs maneuverability? If the journey is shorter than a few months, why do you need artificial gravity? During acceleration and deceleration, the "drum" can be turned off, you can survive without artificial gravity for several hours. Wait, what if it turns out that the space shuttle door does not close, because one wing is too long? Or what if during the construction of the bridge you make a mistake and in the middle of the river span has passed by 2 meters? We are seriously talking about what if someone makes a mistake during construction? Maybe the cylinders are expanding, but I do not know if you've noticed that many ships that deliver different things on the ISS have a cylindrical shape, eg Automated Transfer Vehicle created by ESA, Japan also has its own H-II Transfer Vehicle in the same shape. ISS modules also have this shape. It looks like the cylinder has some advantages over other shapes.

Yea it is big, but isn't simpler to build 700ft diameter cylinder than spinning ring?

I know what you said, but you misunderstand what I said. You do not have to heat and cool the entire engine. One metal panel may heat up (the red one elements), and the blue panel may be cooled in shadow.

Why it needs to be ring? In tv series Expanse I've seen interesting concept. Maybe it would be better concept? Simpler than ring? http://expanse.wikia.com/wiki/Nauvoo

You have energy from the Sun, some said here it is 100 C in very short time. If cooling is so fast as you said this engine would give you enormous amounts of power.

If that is true, why not use Stirling engine instead of solar panel to power up ISS? This engine is very effective at large temperature differences. Anyway I don't want offtopic too much :-) Thanks, I like this explanation.

It was problem with temperature or structure of metals? I was asking about radiating heat from 100 to 0 C. How fast metal can do that in vacuum? And how does it work? In air it is simple, but in vacuum it is something I don't understand.

How metal from car radiate heat in vacuum? And how long does it take to cool down from 100 C to 0 C?

I wasn't talking about sending car into space, only put it on the ground in vacuum chamber. Why would you want car in space? My point is that half of things he said won't happen there. Sure some materials aren't designed to survive in vacuum, but if you are making space craft you do design them in right way. As for day/night temperature, how this car in space (vacuum) would radiate so much heat so fast?

What are you talking about?

But if you would leave this car in vacuum half of those things wouldn't happen?