Re: tungsten rods and run time

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Miles,

Given the 10-11 foot arcs, I'm guessing you are at least 5KVA.  Your 
tungsten may be too skinny for this power level.   Also, your topload 
looks maybe on the small side.  If you make the topload bigger (more 
C), you can add more turns on the primary and reduce the primary current some.

Gerry R.


> Original poster: "miles waldron" <mileswaldron@xxxxxxxxxxx>
>
> Here is a pic of my friends running coil; it is throwing 10 and 11 foot arcs
> right now.
>
> http://www.gravitymagnet.com/kenmay/images/wn1.JPG
>
> We are having the following difficulty and ask your advise. The tungsten
> rods in the async rotary 6 point 4 pickup spark gap glow red hot after 25 to
> 30 seconds of use. Maybe less. The tungsten rods then disintegrate. This is
> bad. How can we improve run time? Do we need another gap? Do we need a
> different kind of gap? Do we need to quench this gap with an air compressor?
>
> Here is a link to a close up of the spark gap:
>
> http://gravitymagnet.com/kenmay/images/blueasync.jpg
>
> Thanks!
>
> Miles & Ken
> http://www.gravitymagnet.com
> http://www.kenscoil.com