Builders' Forum Archives
Re: Magnets - Hatch Cover
Posted by Camper on Aug 4, 2006
For the brave experimenters among us:
Theoretically, if you could arrange for a magnetic short circuit when the hatch was closed, then the effect on any compass would be eliminated.
This would require U-magnets on both boat and hatch. When the two U-magnets came together, the magnetic flux would be short-ciruited and confined almost entirely to the interior of the magnets. (The small air gaps would create some small stray flux)
I don't know if this theory would work in practice. I'm sure it's been tried, like everything else.
I do know that rare earth U magnets are frowned upon, so it would require that you use a weaker type of magnet like steel, iron, ceramic, or AlNiCo. Rare earth U magnets tend to stick together with too much force; I suppose you could argue that if they were tiny enough, they should work, too.
End of theoretical ramble :-)
In Response to: Re: Magnets - Hatch Cover by Laszlo on Aug 4, 2006