The Most Efficiency Electromagnetic Propeller

[waveless]

Seawater is a conductor, if a conductor is moving in a magnetic field and cutting the magnetic line, the conductor will generate electric current. Using electrical wire to make a short circuit in a ring, the ring is the diamagnetic core. What will happen in this situation? The diamagnetic core will counteract the movement of the conductor.

If using the technology of linear-step motor to make a moving magnetic field under the bottom of the boat, the seawater will be dragged backward, push the boat forward.

Seawater is not a good conductor, but using low voltage electric current and large action area, the problem can be solved.

[JonathanCole]

Not necessaraly the most economically efficient though. Also, there seem to be gaps still in the understanding of the technology as Japanese researchers have discovered. Definitely an interesting technology, though and it could fit well with photovoltaic generators.
http://en.wikipedia.org/wiki/Magnetohydrodynamic_drive
http://www.physics.brocku.ca/courses...ges/f21019.jpg

[waveless]

JonathanCole,

Thank you for the links.

I think that HMD needs very strong magnetic field to overcome reluctance of the gap, it have to use two pole (N and S). My design use faradism and AC, it may more efficient in the principle.

[marshmat]

Look up the Yamato I, perhaps the most successful MHD craft to date. Supercondutcting magnets seem to be needed to get high enough flux across the propulsion unit for the current to exert any substantial force on the seawater. Problem with AC and water is the tendency to instantly kill everything in the water nearby when the power switch is turned on.

[Tim B]

Good luck against container ships and docks. Most of them are steel.

Tim B