Re: [TCML] coupling coefficient

[mddeming@xxxxxxx]

Hi Shaun,

I currently have two coils. The smaller gives the biggest sparks with the least problems when the primary is dead level with the bottom turn of the secondary. The slightly larger one seems to work best when primary is one inch below the bottom of the winding. In the final analysis, the best height for YOUR primary wrt YOUR secondary is the place at which YOU measure YOUR best results.

Matt D


-----Original Message-----
From: Shaun Epp <scepp@xxxxxxx>
To: tesla@xxxxxxxxxx
Sent: Fri, Feb 5, 2010 10:10 pm
Subject: [TCML] coupling coefficient


Something that puzzled me about my coil was how high I had my primary coil wrt 
he bottom of the secondary,  I had it about 2 inches above the bottom of the 
econdary to make the coil perform well.  But I've read on the list other people 
aving them about level and that that was optimum.  I'm checking my coil with 
ilbury's spreadsheets and at level his excel spreadsheet says that k=-0.022 on 
y coil.  
My specs are:
secondary is 4.25 inch dia
ound with 26 gauge magnet wire
Primary ID is 6.8 inches
ound with 3/16 inch copper tubing in a flat pancake spiral, spacing is .3125 
nches. (0.5 inches center to center of tubing)
otal of 12 turns
can anyone shed some light on coupling.
thanks,
Shaun Epp

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