Pole pigs scare me and I've built a coil with NSTs and a 4" OD, 24" tall
secondary. Would definitely want to find someone experienced, locally, to
advise.....
On Wed, Sep 6, 2023 at 4:08 PM Bunny Killer <1stbunnykiller@xxxxxxxxx>
wrote:
> Hey All,
>
> just wanted to clear up a small point on the height to width ratio ( I was
> confused at first), a L/W of 1 to 5 is average, seems to be what most use.
> The 3 to 5 sounded like a 3 foot tall by 5 foot wide secondary
>
> And Amir, how much experience do you have with coiling? Pole pigs develop
> incredible amounts of power and the slightest error will cause damage in
> ways one doesnt want to experience. The reason Im asking is
> by the time one begins to build pole pig coils they have enough experience
> to do the math to know how big or small to design it to. Just asking,
> consider me concerned....
>
> SD
>
> On Tue, Sep 5, 2023 at 5:57 PM Steve White <steve.white1@xxxxxxxxx> wrote:
>
> > Hello Amir,
> >
> > A 40 amp current draw will be a significant coil. The "optimum"
> > capacitance is one that is fully charged at the end of each RSG break.
> > "Optimum" in this sense means that you will be fully charging the
> > capacitor. Of coarse it will work fine if not fully charged, you just
> will
> > not be achieving maximum streamer length. There is no optimum secondary
> > diameter as far as I know. What you do want is an aspect ratio
> > (length/diameter) of 3 to 5 for the secondary coil. Use JAVATC to try
> > different parameters. One of the outputs of JAVATC is capacitor charge at
> > the end of each RSG break. You can never achieve 100% charge because that
> > would theoretically take an infinite amount of time so I would shoot for
> > 95% charge. Use whatever maximum current that is available to achieve
> that.
> > I use a 3x voltage derating for my Maxwell capacitors just for
> reliability.
> > My 6.5 KVA pole transformer-powered coil has been operating for 5 years
> > with no problem.
> >
> > ----- Original Message -----
> > From: "Tesla Coil List" <tcml@xxxxxxxxxxxxxxx>
> > To: "Tesla Coil List" <tcml@xxxxxxxxxxxxxxx>
> > Cc: "Amir Mojarradi" <amojarradi@xxxxxx>
> > Sent: Monday, September 4, 2023 1:11:06 PM
> > Subject: [TCML] Pole Transformer Coil Design Guidance
> >
> > Hi all,
> >
> > I was wondering if I could ask for guidance on a Tesla coil I am working
> > on - I want to make the smallest Tesla coil (primary and secondary) with
> > the supplies I have:
> >
> > - 10kVA pole transformer (240V/14400V)
> > - a Lincoln Arc Welder (as a current-limiting ballast for the pole
> > transformer)
> > - (2) 0.22uf 50kv Maxwell capacitors (could be in series for 0.11uf)
> > - (2) 0.03uf, 35kv Maxwell capacitors (could be in parallel for 0.06uf)
> > - Copper Tube Gap Spark Gap
> > - Async Rotary Spark Gap w/ Black and Decker Motor
> >
> > If I run the pole transformer with the current-limiting welder set to the
> > lowest setting (ie, 40A), what would be the optimal tank capacitance
> value
> > to use?
> >
> > Also, on the lowest setting of the welder, what would be the advised
> > minimum diameter for a secondary coil (ie, would a “4 inch secondary be
> too
> > small?) and the minimum thickness of a primary coil (ie, would 1/4”
> copper
> > tubing be too thin)?
> >
> > Any suggestions or guidance would be greatly appreciated!
> >
> > Will report back with photos as I progress!
> >
> > Thanks!
> > Amir
> >
> >
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> >
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--
Joshua Thomas
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