Re: flat coil ?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jolyon Vater Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>

Would it not be possible possible to use imperial inches for Do and Dw
rather than metric if preferred? Looking at the equation I don't see why
not.

Also in the equation for Total Length of wire the expression "D" crops up.
Is D actually Do as I surmise or is it the average diameter or maximum
diameter?

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, April 24, 2002 11:42 PM
Subject: Re: flat coil ?


> Original poster: "Chris Swinson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <exxos-at-cps-games.co.uk>
>
> Hi all,
>
> Thanks for everyone's help. I cut the coil form out today and hope to wind
> it tomorrow.  Will be interesting to see what inductance it will actually
> be. I guessed it about about 8mH but could end up anything. Does anyone
know
> the self C of the coil ?  Most tesla programs will not work with this type
> of flat coil so its hard to tell on specs of this coil :-\
>
> Thanks,
> chris
>
>
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Wednesday, April 24, 2002 4:14 AM
> Subject: Re: flat coil ?
>
>
> > Original poster: "Bert Hickman by way of Terry Fritz
<twftesla-at-qwest-dot-net>"
> <bert.hickman-at-aquila-dot-net>
> >
> > Hi Chris,
> >
> > You can estimate the wire length and outer diameter of the spiral coil
> > as follows:
> >  Let:
> >   Starting diameter = Do  ("inside" diameter)
> >   Number of Turns   = N
> >   Wire Diameter     = Dw
> >
> >  Then:
> >   Total Length of wire  = Pi[(N+1)*D + Dw*(N^2 + N)]
> >   Outer spiral Diameter = Do+(2*N*Dw)
> >
> > Plugging in Do = 0, N = 500, and Dw = 1.6mm and converting units, I end
> > up with a coil about 5.25 feet in diameter, requiring over 4100 feet of
> > wire.
> >
> > Working backwards, a 4 foot diameter coil would require about 381 turns
> > and 2400 feet of wire.
> >
> > Hope this helps!
> >
> > -- Bert --
> > --
> > Bert Hickman
> > Stoneridge Engineering
> > Coins Shrunk Electromagnetically!
> > http://www.teslamania-dot-com
> >
> > Tesla list wrote:
> > >
> > > Original poster: "Chris Swinson by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>" <exxos-at-cps-games.co.uk>
> > >
> > > Hey all,
> > >
> > > I am just about to build a large flat secondary coil.  The wire length
> will
> > > be 2000ft, the wire dia is 1.6mm. I *think* this will be 500 turns at
> about
> > > 4foot dia.  Anyone got any ideas if that sounds about righ before I
wind
> the
> > > thing ?
> > >
> > > Thanks,
> > > chris
> >
> >
> >
> >
>
>
>
>