Re: [TCML] Subject: current & fuses and toroid diameter, etc

[FutureT@xxxxxxx]

In a message dated 12/31/2007 10:50:38 A.M. US Eastern Standard Time,  
evp@xxxxxxxxxxx writes:

>>Marko,

>>Spark streamers will tend to reach out by  about 3 to 3.5 times
>>the toroid diameter.  Possibly a little  longer at higher  breakrates.  
>>Spark streamers will tend  to reach out by 10 or 11 times
>>the toroid minor diameter.   This is just a rough rule of thumb
>>that I use.  So it's mostly  the toroid diameter that's limiting
>>your spark lengths.  Using  700 turns vs. 1000 + turns will
>>only reduce your spark lengths by  maybe 10% or so.

>>John"

> Seems to me  that the terminal diameter would only limit the spark length 
if the power was  very >high.  Also, IF the secondary is tuned properly, why 
would the  output voltage be affected by the number >of turns and the secondary  
inductance?

>Ed


Ed, 
 
Marko mentioned that his spark length was not as long as that  of
some other coils for the amount of power he was using.  My  comment 
was specifically for his coil situation.  Once the streamers reach 3  or
3.5 times the toroid diameter, it's very hard to get longer sparks  at
120 bps.  Once the sparks reach that length, adding more power tends  to
create a greater number of streamers, instead of longer  streamers.
Certainly the sparks will never even reach 3 or 3.5 times the  toroid
diameter if the power is too low.  Marko is using enough power to  
create at least 80" sparks, but he's only getting 40" or so.  I  think
the small toroid is the culprit on his coil.  He may be able to  get
a little more spark length using his toroid but it may max out at
45" or 50" the most.  I'm basing all this on a 4" x 15"  toroid.  
If I'm mistaken, and his toroid is actually larger, then his sparks
may be longer.  
 
Regarding the secondary turns, a greater number of turns  (more
inductance) may reduce the gap losses by increasing the  pri surge impedance
as Malcolm used to talk about.  There may be other advantages  of
using more secondary turns also.  I believe many folks have  reported they
obtained longer sparks with 1000 or more turns than with 700 or  so.
If the secondary coil is rather wide, it may be OK to use  fewer
than 1000 turns and still get a good result.  
 
John









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