Re: [TCML] Coil V4 fail

["Teslalabor" <teslalabor@xxxxxxxxxxx>]

Hi,
really no one has any thoughts about my new TC and its melting SRSG, because 
of its energy transfer problems?

Here again two videos and the specs of the system:

http://www.youtube.com/watch?v=3pUh3UVZdiE

http://www.youtube.com/watch?v=Abr3rxYUH5o

In my opinion the sparks should be far longer.

Input: 0 - 400V 20A from variac
Tank circuit: 4 PT's each 100V / 10000V. Connected in series on low voltage
side and parallel on high voltage side. So if variac is on 100%, every PT
gets 100V and delivers 10kV. They are ballastet on the LV side via a ballast
inductor with air gap, so that the short circuit current without tank
circuit is arround 950mA.
Caps: 2 commercial BOSCH Pulse Caps each 25kV / 500nF in series, giving 50kV
/ 240nF measured.
Gap: Propeller Gap:

http://www.youtube.com/watch?v=O84SI50g0NY

Secondary is 25cm diameter, 1,5m long
and wound with 0,5mm wire + 0,4mm spacewinding.

The following problems: I think the coupling is to tight. Actually the lower
turn of the secondary is 3cm ABOVE the flat primary. When I put it lower, I
get bad racing sparks on the secondary surface.
Should I remove some inner turns of the primary, so that I can put the
secondary lower? Would this prevent the racing sparks?

Next possibility: Is 240nF to much capacitance in this TC? The matched 
capacitance for resonance at 50Hz are 318nF, so I actually run the system 
slightly STR. I have some more of the pulse caps.
Should I put a third one in series? Then I would get 166nF tank capacitance. 
This would increase the bang voltage and so the bang size, of course
I would have to change the firing of the SRSG some ms earlier. Would this
decrease the gap losses and so solve the heating problem of the SRSG?

Best Regards
Stefan 

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