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

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

Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> 


You should be able to make a 12 x 48 inch toroid for under $75 using our
method of styrofoam and plywood construction.  Keeping it at 48 allows the
width of a single sheet of plywood.

I will email you some photos of our large 30 x 10.5 ft toroid.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, October 26, 2004 6:31 PM
Subject: Re: foil-covered inner-tubes for large toroids?


 > 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
 >  >
 >  >
 >  >
 >
 >
 >