Re: Help designing 18 inch coil

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

Original poster: "Malcolm Watts by way of Terry Fritz <teslalist-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Peter,

On 17 Jul 2003, at 5:48, Tesla list wrote:

 > 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)?

I would start by specifying either a desired result (leaves the
choice of all components open and assumes $$$ available) or start
with what components I do have (e.g. transformer spec) and design a
system for the best possible result. In neither case would I simply
decide that any particular secondary diameter is right for me from
the outset. A properly engineered design always starts with a
detailed specification.

Malcolm

 > Details on
 > 
<http://members.iinet-dot-net.au/~pterren/feedback11.htm>http://members.iinet-dot-net.au/~pterren/feedback11.htm
 >
 > Cheers
 > Peter (Tesla Downunder)
 >
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