Re: [TCML] Black polyethylene pipe ok for secondary?

[Greg Peters <greg.j.peters@xxxxxxxxx>]

Agreed. That was one thing I was afraid of. I have seen a black poly pipe secondary fail in Tesla Coil duty but that was a coil producing over 3x the winding length so I figured it might have happened with any form. I'm cautious enough to avoid it altogether though I suspect it can't be any worse than cardboard!

On another note, I was thinking that filling the inside of the secondary with expanding polyurethane foam (cheap, comes in a spray can) might be a good way to prevent internal arcing and may allow us to make ground terminals with a bolt through the form. I find making the ground and toroid terminal the hardest part of secondary construction. It would be nice if we could just use a nice solid bolt through the side! Surely filling the form with polyurethane foam would make the inside of the form less conductive than the outside, in which case the coil could always be expected to fail externally first right?! Any thoughts?

Sent from my phone

On 22/08/2013, at 4:47 PM, bturner@xxxxxxxx wrote:

> Would test a section first. Not so much a factor of 'loss', rather one of
> conduction at the high voltages... Not fun seeing one's hard labor wiped
> out with a permanent carbon track all the way down the coil form... (And I
> speak from experience there.)
> 
> The GREY PVC 'duct' type material seems to work fine. My TC is wound on it
> and it's been chugging along well over 12 years now.
> 
> - b
> 
> 
> 
> 
> 
>> Hi all,
>> 
>> Has anyone tried using black LDPE pipe for a secondary form? I'm guessing
>> it would be fine but I assume it is coloured using carbon so I don't know
>> how lossy it might be. Any thoughts?
>> 
>> Cheers,
>> 
>> Greg._______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
> 
> 
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla