Re: [TCML] VTTC-tuning. John got me started ;-)

[futuret@xxxxxxx]

Dex,

VTTC's don't seem to show much growth in spark length from
60Hz pulse to next 60Hz pulse.   I use the formula:

 Spark length (inches) = 0.5*sqrt input power (watts wallplug)

This assumes steady raw AC operation on 60Hz, not staccato,
nor DC input power.

Using a much larger rather than smaller toroid doesn't seem to improve
the spark lengths for VTTCs.

My coil which had a 3" x 12" secondary wound with 28 awg wire
seemed to work well at 2000 watts for 24" sparks.  Also Steve Ward's 4" 
x 15"
secondary worked well with the 26 awg wire he used.  I forget what
his maximam wattage was.  I think he got up to 26" sparks or so.
Others eventually got longer sparks perhaps at 30 PPS staccato rate.

John


-----Original Message-----
From: Dex Dexter <dexterlabs@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Thu, 2 Apr 2009 6:40 am
Subject: Re: [TCML] VTTC-tuning. John got me started ;-)



Some additional questions about VTTCs:

1. Is there something similar to Freau's spark lenght-power input 
formula for
VTTC
making swordlike sparks?Or do VTTCs reach almost max spark lenght for 
only 1
semicycle
of 60 hz excitation?

2.Why usually small toroid on the top of VTTC secondary instead of 
comparatively
bigger one
 used for spark gap tesla transformer?

3.Is this a good formula to roughly estimate top volts:

0.5*L*di/dt < V < L*di/dt

where i denotes secondary base current ,L low frequency secondary 
inductance,t
time.

4.Where to find recommendation "wire gauge vs power input" for VTTC?


Thanks for replies.

Dex

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla