Re: New coil takes shape

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>

Mike,

I sincerely hope your 10 mm between layers is filled with something more
insulative than air!  If it's only air, than the outer part of your primary
windings will surely arc to each other--very bad!

Here is what Malcolm Watts sent me in 2000 regarding his stacked primary:

"The simplest approach is to design a spiral for about 30% of
the total inductance needed and then build a second identical
spiral and stack them with a spacing between spiral layers of
about 4 times the conductor diameter which allows room for
insulation.
     I prefer to spiral one inwards and the other back
outwards and tap inwards from the outer edge of the lower
spiral and usually use a sheet of acrylic to separate the
layers."

--Steve Y.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, April 29, 2006 12:44 PM
Subject: New coil takes shape


> Original poster: "Mike Tucknott" <michael.tucknott@xxxxxxxxxx>
>
> Hi All
>
> Thanks for the info on stacked primarys, our new coil is now well under
way
> and should
> be finished in a week or two, only the primary still to build it`s going
to
> be two layers
> of ten turns made of 10mm thin wall tubing.
>
> 10mm between turns and 10mm between layers.
>
> Just one qustion do the two primarys need to be wound in oposite direction
> ?????
>
> For some pics of our new coil goto:-
> http://freespace.virgin.net/michael.tucknott/bm6_coil_pictures.htm
>
> Cheers Mike Tucknott