Re: Help designing 18 inch coil

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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)
 >
 >
 >
 >
 >
 >