The Gabriel Device, possible COP=8

[taomaster]

If you don't have an answer yet to metal casting info....

Perhaps the easiest method to get cast metal would be to use sand casting. You have to have a "reverse mold" form (i.e., the way you want the object to look), then you press it into a box of clean, slightly damp sand. (I think they use water, but I don't remember; I did some sand casting in Jr. High, back when they still had shop classes in schools 40+ years ago.) The damp sand holds the shape of the object. You then carefully pour the molten metal into the mould (you don't want to destroy the shape). If it doesn't turn out quite right, you can melt it down and try again. You should probably do some more research to get the method exactly right, but this is the jist of it.

Hope this helps.

[Myzter]

Just browsing through it, that it was kind of interesting

Electromagnetic Biostimulation of Living Cultures for Biotechnology, Biofuel and Bioenergy Applications

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2790121/

[Magnethos]

Has anyone a list of the reluctance of different materials?

[gyulasun]

Has anyone a list of the reluctance of different materials?

It is easier to find the permeability of materials (and to be aware of the reciprocal relationship between reluctance and permeability, at unity material length and cross section). So the lower the magnetic permeability of a material, the higher its reluctance i.e. the less readily it conducts magnetic flux.

see the charts in the these links on permeability

http://www.microwaves101.com/encyclopedia/magneticmaterials.cfm

http://www.coilgun.info/theorymath/home.htm

[Magnethos]

It is easier to find the permeability of materials (and to be aware of the reciprocal relationship between reluctance and permeability, at unity material length and cross section). So the lower the magnetic permeability of a material, the higher its reluctance i.e. the less readily it conducts magnetic flux.

see the charts in the these links on permeability

http://www.microwaves101.com/encyclopedia/magneticmaterials.cfm

http://www.coilgun.info/theorymath/home.htm

Thanks for the links,
So, the high the reluctance, the lower it conducts magnetic flux. Copper has a very low permeability, so if we use copper as the material in a transformer's core, then... nothing or almost no magnetic flux would flow?
I don't know what kind of material Thane Heins uses in the primary core, but I read that only reactive current (scalar) can flow in the primary core since it has a high reluctance.

But in classical theory... is almost imposible to make a transformer using copper as the core?

Another question I have is about the magnetic reluctances, I think that if you try to power a device using back-emf, you can get COP>1 if you energize a first coil with a high reluctance core and then you collect the back emf in a secondary coil containing a high permeability core. The collapsinng field would produce more energy in the high perm. core that the energy nedded to produce the magnetic field in the primary core. I think I read something about this sometime ago.