Re: Help designing 18 inch coil

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

Original poster: "Peter Terren by way of Terry Fritz <teslalist-at-qwest-dot-net>" <pterren-at-iinet-dot-net.au>

Hi all
Thank to Colin Heath, Terry Blake and Malcolm Watts for their replies on
list, and Dr Resonance and Greg Peters offlist re the 18 inch coil.
Time to start winding.

Cheers
Peter Terren  (Tesla Downunder) http://members.iinet-dot-net.au/~pterren/



  ----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, July 18, 2003 5:26 AM
Subject: Re: Help designing 18 inch coil


 > Original poster: "colin.heath4 by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <colin.heath4-at-ntlworld-dot-com>
 >
 > hi peter,
 >              remember that a coil of 50" secondary diameter will not
perform
 > any better than 6" coil without the right components. sorry if im teling
you
 > how to suck eggs(english saying).
 > but 21 gauge seems far to small for a big coil of high performance!
 > the ratio also seems small for the secondary. the problem then becomes
 > either strikes to the ground or to the components below.
 > performance comes from the power, the caps, the quality of thr primary
 > circuit build and the gap. the secondary makes little difference!
 > you can wind that secondary as big as you like but the limit comes close
to
 > the winding length times three unless you go magnifier.
 > 1680 turns on this former will give no better performane than a coil of
 > smaller diameter with the same inductance unless of course the aspect
ratio
 > is to tall then the coupling frequency splitting becomes a prob.
 > im not puuting you down for building this i wish you every success but the
 > key to performance lies with the whole system. ( i know iv built 12" coil
 > with same bits as six inch and made sod all differance)
 > cheers
 > colin
 >
 > ----- Original Message -----
 > From: Tesla list <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Thursday, July 17, 2003 12:48 PM
 > Subject: Help designing 18 inch coil
 >
 >
 >  > Original poster: "Peter Terren by way of Terry Fritz
 > <teslalist-at-qwest-dot-net>" <pterren-at-iinet-dot-net.au>
 >  >
 >  > Hi all
 >  > I am going ahead with an 18 inch coil and have had a very nice 18 x 59
 > inch
 >  > former made up from polypropylene. I am a bit undecided about
construction
 >  > of the secondary.  I have a feeling that 54 inches of 21 G at 1680
turns
 >  > would be reasonable as I have a preference for a high inductance, large
 >  > toroid system as this seemed to be good for my 6 inch coil with sparks
of
 >  > 96 inches = 3 times the secondary length of 32 inches. I also have a
 >  > preference for a large diameter primary possibly even with fairly high
 > (but
 >  > more even coupling) as per Richard Hull's Nemesis.
 >  >
 >
<http://www.richmond.infi-dot-net/%7Erhull/highenergy004.htm>http://www.richmond
 > .infi-dot-net/%7Erhull/highenergy004.htm
 >  >
 >  > What would other people do (and more importantly, why)?
 >  >
 >  > Details on
 >  >
 >
<http://members.iinet-dot-net.au/~pterren/feedback11.htm>http://members.iinet.ne
 > t.au/~pterren/feedback11.htm
 >  >
 >  > Cheers
 >  > Peter (Tesla Downunder)
 >  >
 >  >
 >  >
 >  >
 >  >
 >  >
 >
 >
 >
 >