Re: First light with new 12" secondary

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

Original poster: "Dr.Resonance by way of Terry Fritz <twftesla-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>


Greg:

You might try various elevations on the sec. coil to set the coeff. of
coupling.  Just use some scrap pieces of 1/2" plywood.

I'm going to guess you will need a sec above primary elevation of around 4-5
inches for max output.  With our coil of 18 in. dia. we need 7.25 inch
elevation for max. output.

Best regards,

Dr. Resonance




----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, December 18, 2002 5:02 PM
Subject: First light with new 12" secondary


 > Original poster: "Gregory Peters by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <s371034-at-student.uq.edu.au>
 >
 > Hello all,
 >
 > Just fired up the coil with the new 1170 turn 12" secondary and an
 > extra string on the MMC (now at 0.15uF). Tuned the coil roughly with
 > the CRO, and set the coupling pretty loose (not going to fry this
 > secondary as well). Fired up the coil, synced the gap at 200BPS and
 > recorded 11.5 foot strikes with first run. I feel the coil could do
 > better, but it is running nicely and reliable (ran it for 4 min
 > continuously), and is using all the space it has available anyway
 > (nice ground strikes). I haven't even tried to vary the tap point,
 > toroid height, coupling, etc.
 >
 > I was finally able to remove the breakout point - beautiful high
 > current arcs. Input was my 11kV pig. Current draw sat dead steady at
 > 38 amps. An absolute pleasure to run. A good night by anyone's
 > standards. No smoke :) Photos soon.
 >
 > I want to increase the coupling, but have noticed that racing arcs
 > tend to do pretty bad damage rapidly at ~10kVA. Think I will leave it
 > as is.
 >
 > I'm going to make a tape with all my coiling activities, including
 > ballasting, gaps, control cabinet, etc - not to mention spark
 > footage. Anyone interested? Cost is only for shipping and tape. 5USD
 > at a guess. Will also post some digital video to my site (if Terry
 > will give me some space) at some point - still got free space Terry?
 >
 > Cheers,
 >
 > Greg.
 >
 >