RE: Stumped at first light

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

Original poster: "Steven Ward by way of Terry Fritz <twftesla-at-qwest-dot-net>" <srward16-at-hotmail-dot-com>








>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: RE: Stumped at first light
>Date: Tue, 26 Nov 2002 12:35:48 -0700
>
>Original poster: "Mccauley, Daniel H by way of Terry Fritz 
><twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
>
>.066
Oops,  you mean .0066uf!  .066 is way to big!



>I already see two possible problems:
>
>1.  Your primary doesn't seem to have enough turns.  You should probably go
>for about 12-14 turns ideally.
>     Also, 1/4" of spacing between turns should be plenty for this coil.
>This will keep a 12-14 turn primary
>     to a respectible size.
>
>2.  Strike Rail - Although you didn't mention it, you need to make sure your
>strike rail IS NOT continuous.  It should
>     have a 2-4 inch gap.  Remember, you are basically added a short circuit
>to your magnetic circuit with a continous
>     spark rail.
>
>3.  Capacitor Size - For a 12000V, 30mA -at- 60Hz NST, you should be looking
>for around a 0.066uF capacitor.

Again .0066uf or about 6 to 8 beer bottle caps if you go that way.


>Dan
>
>
>
>
>    My class has built most of our coil and I am a little sceptical about
>our capacitance calculations. We would very much like to fire it up, but I
>think it needs a little fine tuning. Here is what we built: feed-12000v NST
>-at- 30ma, adjustable spark gap built out of copper tubing, The primary is 6
>turns of 1/4" copper tubing with a 3/4" gap between turns, the secondary is
>1000 turns of 22 ga. magnet wire on 4" pvc with a heighth of 26 5/8". We
>have an 8" gazing ball or 4" aluminum flex duct for a topload. We built a
>strike rail around the primary out of  #2 bare copper. Will this work, and
>what kind of capacitors do we need. Any help would be greatly appreciated.
>Thanks.