Re: Spacing??? Too much?

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

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <FutureT-at-aol-dot-com>

In a message dated 4/11/01 6:24:29 PM Eastern Daylight Time, tesla-at-pupman-dot-com 
writes:

> Designing another coil (#4) :-)
>  
>  Do you think that , with a 7" secondary, 22awg magnet wire, 28" long, and a
>  20 turn, .25in refrigerator tubing primary, that a gap of 3' inches between
>  the primary and the secondary is too much??  How about .50 inches spacing
>  between primary turns????
>  
>  The thing will only be running a 9kV/30mA NST...
>  
>  ???? Whadda ya'll think????
>  
>  thanks
>  Erik

Erik,

In one of my coils, I used a 6.5" dia x 24" long secondary wound
with #28 wire.  The primary was 24 (?) turns of close wound #12
stranded wire.  When I powered this with a 9/30 NST, it gave
24" sparks or so (I'd have to check my notes for the exact spark
length).  The cap was 0.0147uF.  I used a sync rotary gap.

I usually use a somewhat closer spacing between primary and
secondary.

John