Re: [TCML] Toroid thickness effects

[FutureT@xxxxxxx]

In a message dated 6/12/2008 8:03:15 A.M. US Eastern Standard Time,  a_petti
t_jr@xxxxxxxxx writes:

>I still question those spark length calculations.
>Are you  sure the 4'+ is realistic for a 12/60  and
>4" dia coil  ?
>From my early tests with a 12"x3" toroid, I will be 
>more in  the mid 20" range.


Alex,
 
My TT-42 coil produces 42" sparks from a robust 12/30 NST.  A  regular
12/30 NST gives 38" sparks.  To obtain this kind of efficiency  requires
a 120 bps sync gap, or a 120 bps triggered gap.  Also the  capacitor
must be large enough.  I use an 0.014uF cap.  I use a 4" x  13" toroid.
As a test, I once installed a 6" x 24" toroid.  Then the coil gave  44" 
sparks. 
The secondary is 4.2" dia by 19" tall.   
 
  _http://futuret.110mb.com_ (http://futuret.110mb.com) 


Gary Lau's coil uses a 15/60 NST and produces 80" sparks  using
a 120 bps sync gap.  He uses a rather large capacitor and  toroid.
His secondary is larger too.
 
In other tests I've obtained 58" to 62" sparks from a 4" coil.
 
Cheers,
John











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