# Magnetic propulsion in space

1. Jun 27, 2008

### Relena

Can the idea of magnetic propulsion applied in magnetically levitated trains be used in aerospace?

My conceptual model is as follows : using the magnetic field of earth ( very weak I know) to repel a superconducting coil, with large surface area and moving very fast . Thus the lifting force should be enough for aviation .

for example : make aircraft wings from a super conductor plate at the bottom and a paramagnetic material from the top so repelling magnetic field lines beneath the wings.

I know that would require a huge wing span and very high speed but , What about the concept?

2. Jun 27, 2008

### Abraham

Does anyone have any equations that would describe this?

3. Jun 27, 2008

### Staff: Mentor

Since theh magnetic field of the earth is so weak, it isn't possible to build a large enough magnet to levitate an object above the earth itself.

4. Jul 3, 2008

### CFDFEAGURU

Assuming this propulsion is possible, how would you plan to support a huge wingpsan from the fuselage? Also, how slow would the flight controls response time be on a huge wingspan?

5. Jul 4, 2008

### redargon

Just to understand what you want to do: Do you want the earth's magnetic field to generate the lift or the propulsion of the craft, or both?

I think of you had enough energy to reach the speeds you need to make the force required to generate lift, then at that speed you could just use conventional methods for lift.

Magnetic take off rails have been conceptualised for a while now to aid the take off of aircraft. With much the same principles as the maglev trains, a rail accelerates the aircraft to take off speed and/or more to propel it into the air. Maybe you could use a combination of ideas, seeing that you would have magnets/superconductors on the craft anyway, just a thought...

How strong is the earth's magnetic field, do you have a number? Does it vary a lot around the earth? It obviously varies with height above the earth too, yes?

I'm not an expert on magnetism, but I hope that helps a little on along the way.

P.S. your diagram looks suspiciously like a flying saucer, I hope what you want to do hasn't been patented by ET's or the government

6. Jul 4, 2008

### redargon

oooi, bad news, just did a little reading on the subject: earth's magnetic field is around 0.3-0.6 gauss (about 100 times weaker than a fridge magnet!). It compresses in the day and expands at night and it is governed by inverse square laws (assuming you're close enough).

this could be tricky...

Last edited: Jul 4, 2008
7. Dec 11, 2008

### mahayes

8. Dec 11, 2008

### Mech_Engineer

Argh! My eyes!

9. Dec 11, 2008

### FredGarvin

I am borderline ready to report that post for crack pot posting but it's too tough to read through. Maybe I'll just report it for bad formatting.

10. Dec 11, 2008

### Danger

Thank you, Fred! I thought that I was the only one who couldn't follow it.

11. Apr 27, 2009

### rayfrye

I have researched this topic in great length, the method, even the physics laws have to be lightly followed because the basic rules that say it is impossible, have to be disproven, and can be! This requires a different look at magnetics, plasma, and light, because once the craft leaves the magnetic field of the earth the craft would have to use another form of magnetics with light and plasma plus a classified 4th element that would pinpoint another magnetic field as the attraction destination. The heat part of this equasion says to me you are on the right track, but keep in mind the heat factor will not be an issue once you are in the vacuum of space I will post a video and provide a link to it in a new post. Give me a little time to record the lift and the amazing speed in which it disappears and returns just as fast, slowing to a speed in which it can land with soft enough to keep it intact.
Magnetics can be used for flight, but it would be extremely dangerous for anyone to travel with the craft because it crushes insects.