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Sanity Check for me




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From:  Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent:  Tuesday, March 17, 1998 2:22 PM
To:  Tesla List
Subject:  Re: Sanity Check for me

Hi Michael,

> From:  baumann-at-proton.llumc.edu [SMTP:baumann-at-proton.llumc.edu]
> Sent:  Monday, March 16, 1998 3:45 AM
> To:  tesla-at-pupman-dot-com
> Subject:  Sanity Check for me
> 
> I have the opportunity to get a rather large diameter chunk of PVC,
> and am now dreaming of that monster coil. However, when I start running
> the numbers - I need a sanity check from some of you more familiar with
> this size beast:
> 
> What I have the chance for is some 18" diameter PVC, in about 6ft
> sections. Leaving my sanity out of the question for the moment, i
> thought this would be a rather nice coilform. 
> 
> Then I started running numbers: 
> If I use 18AWG wire, WinTesla tells me that at 44inches, I would
> have an unloaded frequency of about 77Khz, at an HD ratio of 2.35
> This is about 1000 turns and about 5000 ft of wire.

I'd be seriously tempted to get the h/d ratio up to 3, maybe even more 
and space wind it with the #18. Benefits - even lower copper losses, 
can withstand much higher output voltages (building for the future).

> If I use 22AWG still aiming for 1000 turns: ratio drops to 1.5 (27")
> and frequency to about 70Khz
> 
> I would assume the 18AWG is required to keep the resistive losses
> down.
> 
> Throw a 6"x36" toroid on there, and the frequencys drop to the
>  40khz range, and the cap size jumps from about 0.03 to 0.07 for 22awg
>  and from 0.02 to 0.05 for the 18AWG, operating frequencies drop
>  into the 40Khz range
> 
> Primary would be close to 100ft of tubing if I used 1/4"
> 
> Would I be wasting my time? And if so, is there a use for this 
> large PVC that I don't see? [It's going in the trash unless I find
> a use..]

Unlucky for me that I don't live in your location :)   Nice score.

Malcolm