Romero's experiments and OU principles

[e2matrix]

It's in the almost 200 page thread somewhere ...    I seem to remember it being about 2 ohms and some others that were close in making early coils had close to that if they had the same Litz wire.  But my formerly photographic memory is a bit fuzzy these days so don't take my word on it. 

BTW I posted this in the main thread but no takers so maybe Romero or someone here might like to take a guess on this plan:
I've got a bunch of old hard drive magnets that are mounted on Mu metal.  I've got a good metal bandsaw and I thought about knocking off the magnets and cutting the Mu metal pieces into strips about wide enough to put 3 or 4 into a coil core.  I think I could probably get about 2 cores per piece of Mu metal.  This band saw has been good for even cutting 0.30" thick Titanium so I don't think it will have any problem cutting the Mu metal.  Does anyone see any problems with this idea?  It will be a slow process but a couple hours of cutting I think will yield enough for all the coils.  They would probably be a 1/8" x 1/8" x coil length (about 5/8" long) and I think I'd tape several pieces together for each core. 

[Magluvin]

Is that what is in the HD that the magnets are on?

Better to use a dremel with a cutting wheel. You can get nice cuts with patients and not waste the material. ;]

I have been throwing away mumetal?

Hmm

Soo, if 2 ohm, then the coil is wound bifi, no separation of strands. The series connection is made on the coil itself somewhere. That will mean a rewind for some. I would try a couple first. ;]

Mags

[wings]

It's in the almost 200 page thread somewhere ...    I seem to remember it being about 2 ohms and some others that were close in making early coils had close to that if they had the same Litz wire.  But my formerly photographic memory is a bit fuzzy these days so don't take my word on it. 

BTW I posted this in the main thread but no takers so maybe Romero or someone here might like to take a guess on this plan:
I've got a bunch of old hard drive magnets that are mounted on Mu metal.  I've got a good metal bandsaw and I thought about knocking off the magnets and cutting the Mu metal pieces into strips about wide enough to put 3 or 4 into a coil core.  I think I could probably get about 2 cores per piece of Mu metal.  This band saw has been good for even cutting 0.30" thick Titanium so I don't think it will have any problem cutting the Mu metal.  Does anyone see any problems with this idea?  It will be a slow process but a couple hours of cutting I think will yield enough for all the coils.  They would probably be a 1/8" x 1/8" x coil length (about 5/8" long) and I think I'd tape several pieces together for each core. 

much better is to cut stripes from foil like this

http://cgi.ebay.com/Mumetal-magnetic-shielding-sheet-/320711045986?pt=LH_DefaultDomain_0&hash=item4aabde3362#ht_500wt_1156

[Magluvin]

Does anyone have some good pics of a coil?

Maybe we can see detail of if its bifi.

In this pic, the upper right one looks too have 2 wires coming from the core outward, and in the other coils I tend to see the output wires not coming from the rotor side surface of the core.

Mags

[teslaalset]

One final set of remarks from my side on this capacitor thingy and then I will stop nagging.

Earlier yesterday I posted in the main OU discussion thread that multifilar wire ( = litze) probably includes a capacitance of several tenths of pF (see http://www.overunity.com/index.php?topic=3842.2940 , reply #2940).
Quite different from the uF range values that others came up with.

It would be good to just having confirmed that multifilar is the way to go, rather then expressing the same thing as some sort of special winding is necessary to get added capacitance in the coil. Most of the forum member have no clue what you're talking about.
Advising in a too cryptical way will lead to even more cluttered discussions.

I am seeking for some kind of confirmation on my estimation that we have a few tenths of pF here.
Anyone with a trustworthy () link?

[update]
Interesting links I found myself:
http://www.westbay.ndirect.co.uk/capacita.htm
http://www.magnetricity.com/NeoG/Bifilar.php (in particular fig 2 raises questions when projected to a 7 strand mutifilar coil as we are suppose to use)