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### Can a thruster using geomagnetic fields and superconductors generate a thrust?

Posted: Tue Jan 29, 2019 6:29 am UTC
As shown in the figure, the thruster is equipped with a geomagnetic field convergence layer, which is a superconducting material. The geomagnetic field convergence layer repels and blocks the magnetic flux of the geomagnetic field, so that the magnetic flux of the geomagnetic field passes through the narrow area between the upper and lower convergence layers. The geomagnetic field intensity B in the narrow area between the convergent layers of the geomagnetic field is enhanced.The thruster is also equipped with a electrifying coil, and the lower end of the coil is located in a narrow area between the convergent layers.

### Re: Can a Thruster that uses geomagnetic fields and superconductors generate lift?

Posted: Tue Jan 29, 2019 3:28 pm UTC
AFAIK it will generate lift, but not enough to overcome Earth’s gravity if it has to lift its own power source.

### Re: Can a thruster using geomagnetic fields and superconductors generate a thrust?

Posted: Tue Jan 29, 2019 4:55 pm UTC
ijuin wrote:AFAIK it will generate lift, but not enough to overcome Earth’s gravity if it has to lift its own power source.

If the area of ​​the geomagnetic field convergence layer is large, use it to increase the geomagnetic field by 100-1000 times, if the coil uses a superconductor material and a larger current is passed, should it overcome gravity?

### Re: Can a Thruster that uses geomagnetic fields and superconductors generate lift?

Posted: Tue Jan 29, 2019 7:14 pm UTC
ijuin wrote:AFAIK it will generate lift, but not enough to overcome Earth’s gravity if it has to lift its own power source.

Hmm. So if (and it's a big if) we found some way to wirelessly beam power to a launch vehicle, we could have all-electric single-stage-to-orbit launch vehicles?

### Re: Can a thruster using geomagnetic fields and superconductors generate a thrust?

Posted: Tue Jan 29, 2019 9:19 pm UTC
That's a laser sail, so yes.

### Re: Can a thruster using geomagnetic fields and superconductors generate a thrust?

Posted: Tue Jan 29, 2019 9:37 pm UTC
Not quite the same thing, but I was wondering if there was a way to turn a receiving laser beam into electricity.

### Re: Can a thruster using geomagnetic fields and superconductors generate a thrust?

Posted: Wed Jan 30, 2019 12:25 am UTC
Mutex wrote:Not quite the same thing, but I was wondering if there was a way to turn a receiving laser beam into electricity.

The device is, unfortunately, called a "rectenna." A concept has been floating around for almost fifty years that we could put solar panels in orbit and send energy by maser to rectennas on the surface. The idea is that the maser will not be significantly absorbed by the atmosphere, unlike sunlight. It hasn't received too much attention because at this point it is pretty obviously infeasible given the present costs of spaceflight and electricity.

### Re: Can a thruster using geomagnetic fields and superconductors generate a thrust?

Posted: Wed Jan 30, 2019 3:12 am UTC
lidan2019 wrote:
ijuin wrote:AFAIK it will generate lift, but not enough to overcome Earth’s gravity if it has to lift its own power source.

If the area of ​​the geomagnetic field convergence layer is large, use it to increase the geomagnetic field by 100-1000 times, if the coil uses a superconductor material and a larger current is passed, should it overcome gravity?

The problem is that a larger current requires a larger powerplant, and more fuel if you are using a fuel-consuming method of power generation. This adds more mass, and the mass may be growing faster than the power output. Basically, you have the tyranny of the rocket equation all over again.

### Re: Can a thruster using geomagnetic fields and superconductors generate a thrust?

Posted: Fri Feb 01, 2019 11:00 am UTC
ijuin wrote:
lidan2019 wrote:
ijuin wrote:AFAIK it will generate lift, but not enough to overcome Earth’s gravity if it has to lift its own power source.

If the area of ​​the geomagnetic field convergence layer is large, use it to increase the geomagnetic field by 100-1000 times, if the coil uses a superconductor material and a larger current is passed, should it overcome gravity?

The problem is that a larger current requires a larger powerplant, and more fuel if you are using a fuel-consuming method of power generation. This adds more mass, and the mass may be growing faster than the power output. Basically, you have the tyranny of the rocket equation all over again.

It should also be mentionned that superconductor does not imply infinite current: if you try to put too much current inside one, the magnetic field inside the conductor will exceed the critical field limit and the superconductor will turn into a normal conductor

### Re: Can a thruster using geomagnetic fields and superconductors generate a thrust?

Posted: Fri Feb 01, 2019 1:38 pm UTC
Yes, it may not require a particularly large current