Re: foil-covered inner-tubes for large toroids?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "David Rieben" <drieben-at-midsouth.rr-dot-com> 

Hi Dave,

Thanks for the pointers :^) I have seen websites where they did use
the flexible PVC drainage pipe for the toroid form. I think 4" is about
the largest that can be found at Lowes, at least locally (Memphis), but
I have seen the same kind of pipe that looked to be 12" in diameter
at a farm/tractor supply place. That would give me the minor diameter
that I'm looking for but I wonder how managable this stuff would be
to try to bend into a "donut" shape? It looks like it would be consi-
derably  more unwieldy than the 4" stuff :^O Any more pointers
on that issue? I'd love to be able to make a say 12 x 54 or so
toroid for a large toroid capacitance is the key to making HUGE
sparks, assuming you have the power to push them and that should
not be a problem here as I have a 10 kVA and a 15 kVA pole
transformer at my deposal. They are both 14,400 volt units. I
suppose that I could stack 2 or more 4" thick toroids to get an
effective larger minor diameter but I'd rather have one larger
minor diametered toroid.

Thanks,
David Rieben


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, October 26, 2004 8:57 AM
Subject: Re: foil-covered inner-tubes for large toroids?


 > Original poster: sparktron01-at-comcast-dot-net
 > Richard Hull used a very large inflated donut (may have been a kids
 >
 > swimming pool) on Nemesis originally.  Cold weather will cause a
 >
 > reduction in internal pressure, and the tape will sag...  :^C
 >
 > Best option was 4" (and larger ) flexible PVC drainage pipe available
 >
 > at Lowes, Tractor Supply, Home Depot, Agri-Suppliers.  Use a coupling,
 >
 > cover liberally with Al tape and go.   I've made several large toroids
 >
 > up to 4 x 42" this way and they work fine; plus if you drop or impact
 >
 > them they "usually" won't permanently dent.  FWIW.
 >
 > Regards
 >
 > Dave Sharpe, TCBOR/HEAS
 >
 > Chesterfield, VA. USA
 >
 >
 >