RE: Heat & Rotary Gaps (success?)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: tesla popp <teslas_lab@xxxxxxxxx>

Good question.  I didn't have a secondary in it at the
time.

I now have assembeled one of the twins and I am a bit
irritated.  It is only making 4' sparks at the ~15/120
I am getting from the tranny.  My chokes are really
dampering A LOT of kickback.  Now that the secondary
is in it, my trannys safety gap is firing at 98% full
power, which makes me leery.

Thanks for getting to the point.

Coiler forever: Jeremiah Popp

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
>
> When running an NST through a Variac, the optimal
> phase setting of the
> SRSG will vary depending on the Variac setting.
> Additionally, NST's are
> not the well-behaved linear devices that intuition
> and simulation models
> would have us think.  Ferroresonance occurs at
> higher mains voltages,
> causing an LTR cap to become mains-resonant, and
> draw lots of power.
> Very bizarre stuff and impossible to predict or
> model.  But it does
> effectively supercharge an NST power supply.
>
> Have you metered your NST primary current?  That
> will give a better
> indication of how much power is actually being
> processed by your gap.
> My 15/60 NST pulls close to 20 Amps on the
> input-side of my 120VAC
> Variac, and this is WITH PFC caps.  And as such, my
> propeller gap
> spinning rod is just moderately warm.
>
> I have to ask what may be a dumb question - do you
> have a secondary in
> place and is it properly tuned?  If no or no, then
> the power cannot be
> transferred to streamers, and will be expended as
> heat in the gap
> instead, which may be what you see.
>
> Regards, Gary Lau
> MA, USA
>
>
>
>  > Original poster: tesla popp
> <teslas_lab@xxxxxxxxx>
>  >
>  > Ok, I have a 15/120 NST.  My cap is 0.05uF
>  > Tungstin rod got hot enough to change color.
>  >
>  > I ran it for 30sec and it seams like it won't get
>  > overly hot if I have everything in phase.  Yet,
> if I
>  > run it at 70% power, it gets hot twice as fast!?
>  >
>  > Coiler Forever: Jeremiah Popp
>  >
>  >
>  >
>  > --- Tesla list <tesla@xxxxxxxxxx> wrote:
>  >
>  >  > Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
>  >  >
>  >  > You didn't say what kind of power supply
> you're
>  >  > using?  With my 15/60
>  >  > NST, the rotating rod gets just moderately
> warm.
>  >  > But I'm sure if one
>  >  > were using a pole pig, that may be pushing
> one's
>  >  > luck.  You are using a
>  >  > shield in case things go bad, right?  I
> couldn't
>  >  > comment on a subjective
>  >  > "too hot to touch" without an actual
> measurement,
>  >  > but it is cause for
>  >  > concern.
>  >  >
>  >  > Regards, Gary Lau
>  >  > MA, USA
>  >  >
>  >  >  > Original poster: tesla popp
>  >  > <teslas_lab@xxxxxxxxx>
>  >  >  >
>  >  >  > Just set up one of my twin coils with a
> propeller
>  >  >  > gap...
>  >  >  > I found that after 10 seconds at 50% power,
> the
>  >  >  > rotating tungsten rod was far to hot to
> touch!
>  >  >  >
>  >  >  > Should I be worried about the "heat" VS the
>  >  > SRSG's
>  >  >  > plastic the  case /melting the high density
> PVC
>  >  > that
>  >  >  > holds the rotating tungsten rod?
>  >  >  >
>  >  >  > Jeez is this thing LOUD!!!
>  >  >  >
>  >  >  > Coiler Forever: Jeremiah Popp
>  >  >  >
>  >  >
>  >  >
>  >
>