Hello Finn.I only wondered about the frequency / SS aspect as it seems that when they are employed (not often admittedly) it is mostly on SS stuff (can't see why it would matter one bit though). I also considered the 'slinky' type that you mention as well, because one lot of duct I bought as an experiment, was a very thin Alu foil with a plastic air-tight wrapping as its covering. All this was stuck onto a 'slinky' type metal wire former. Stripping the plastic and foil away would have meant I would have had a 3M long x 8 inch 'slinky'.
Only trouble was that 3M wrapped around on itself to achieve a 34 inch diameter meant the 'slinky' would have ended up being stretched far too much. It would work though for a smaller diameter I would think (someone done it I think on a table top?). Unless you have the bending gear though construction for a Thumper tubular type is pretty problematic. I played around unsuccessfully with some ideas for the tubing, but in the end opted for a duct smoothed with wall filler once again (8x34). http://www.hvtesla.com/toroid_2.html (sticking the foil on is a truly boring job!)
However I suspect though that the cost of getting tubes bent professionally, for the coiler to assemble himself, would still be a lot cheaper that a spun Alu' one, and also much tidier than a chicken wire and wood alternative. It is nice looking design to my mind.
(Nice coil by the way - how are your shares in the Acrylic company doing? <smile>)
Phil -------------------------------------------------- From: "Finn Hammer" <f-h@xxxx> Sent: Thursday, July 01, 2010 7:06 AM To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> Subject: Re: [TCML] Thumpers Toroid
Phil Tuck wrote:I am considering a tubular example like Finn's recent "Thumper has utilized. How does the ROC of these toroids relate to the level of charge they can retain?SnipJust a last thought but all of these I have seen are on DRSSTC or other SS stuff, are they just as usable on old style RSG 80 Khz technology or do they prefer a high frequency coil?Charge contained is very close to solid type, which means that we arrive at the same expected capacitive load as calculated with JavaTC, breakdown voltage is unknown to me. Greg Leyh might tune in here, since he introduced this type of toroid to the coiling segment of high voltage. I have seen similar (well, slinky type, really ) constuctions in pictures of russian power plants, so perhaps there is russian litterature about this subject, but where is Father Dest these days?Bert Hickman, master of the litterature, Help us out here!With relation to preferred frequency of operation: Thumper is resonating around the 35kHz mark.....Cheers, Finn Hammer _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
Regards Phil Tuckwww.hvtesla.com
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