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Re: [TCML] coupling coefficient
Hi Shaun,
It appears that you know all of the ins and outs of
running the numbers through a TC design program,
but the 0.022 K that you site could not be right. From
the sec/pri placement that you describe, it would seem
that a 0.22 K would be a far more likely coupling val-
ue. Imperical data has shown that most SG driven
coils seem to fall into an optimal coupling range of
0.1 to 0.2 K, and that often corresponds with the
flat plain of the primary spiral lining up pretty close
to the bottom-most turn of the secondary coil. If
you start increasing your coupling much above this
range, you will often start getting the annoying (and
sometimes destructive) racing sparks running up and
down the side of the secondary coil. You may
have to lower your primary in relation to the se-
condary to prevent the racing sparks from rearing
their "ugly head".
David Rieben
----- Original Message -----
From: "Shaun Epp" <scepp@xxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, February 05, 2010 9:10 PM
Subject: [TCML] coupling coefficient
Something that puzzled me about my coil was how high I had my primary coil
wrt the bottom of the secondary, I had it about 2 inches above the bottom
of the secondary to make the coil perform well. But I've read on the list
other people having them about level and that that was optimum. I'm
checking my coil with Tilbury's spreadsheets and at level his excel
spreadsheet says that k=-0.022 on my coil.
My specs are:
secondary is 4.25 inch dia
wound with 26 gauge magnet wire
Primary ID is 6.8 inches
wound with 3/16 inch copper tubing in a flat pancake spiral, spacing is
.3125 inches. (0.5 inches center to center of tubing)
total of 12 turns
can anyone shed some light on coupling.
thanks,
Shaun Epp
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