Re: Gerry's coil pictures

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

Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net> 

Thankyou for your comments.  Someday I hope to get a digital camera and I
will post those pictures.

Gerry R.

 > Original poster: "Jeremy Gassmann" <gmann-at-fuse-dot-net>
 >
 > You have put great workmanship into this coil and you are getting
 > excellent results in spark length.  I am using 4 - 15 kV 30 mA NSTs and
 > I think I am barely getting 3' arcs if that.  Of course I have a
 > 4.5"x22.5" secondary with only about 900 turns - that could be my set
 > back.  If you ever get the chance, I am sure some of us on the list
 > would like to see more detailed construction pictures such as the top
 > load mounting scheme you use as well as you component layout.  Keep up
 > the good work!
 >
 > Jeremy Gassmann
 > Cincinnati, OH
 > http://jeremyee.tripod-dot-com
 >
 >
 >
 > -----Original Message-----
 > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 > Sent: Saturday, June 05, 2004 10:12 AM
 > To: tesla-at-pupman-dot-com
 > Subject: Re: Gerry's coil pictures
 >
 > Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net>
 >
 > Thankyou Tom,
 >
 > A friend of mine took the photos with a 6Mpix camera and I don't think
 > he
 > did any post processing.    I sent them the way I got them and didn't
 > even
 > think about that.
 >
 > The coil is 8x36 on an acrylic former wound with 1440 turns of 23gauge
 > single build formvar.  Prewinding coat on the sanded former is shellac
 > and
 > there are 6 post winding coats of polyurythene.  I did not sand the
 > inner of
 > the former.  The topload is a 6x24 toroid by D&M (they did a great job)
 > and
 > is mounted on an acrylic tube that slides into another acrylic tube
 > (friction fit) so the toroid can easily be raised (lowest position in
 > the
 > picture).  The tube is placed in a hole in the bulkhead capping the
 > former.
 > There is another solid bulkhead of acrylic about 5 inches down from the
 > top
 > of the former for this tube to rest upon.
 >
 > The primary uses 1/4 inch CU pipe with 1/4 inch space and is designed to
 > be
 > raised or lowered 1 inch from the bottom turn of the secondary.  The
 > strike
 > rail is at a fixed height and with the primary at its lowest (and
 > current)
 > position, sits 3 inches above the primary.  I haven't yet adjusted the
 > primary height for k optimization.  Currently there are 20 turns max and
 > tapped at 20.  Cp is 16.7nf (2 strings of 14 - 0.068uf and 1 string of
 > 14 -
 > 0.1uf CDE caps).  I'm using a static gap made of 1/2x3 inch pipes and 9
 > gaps
 > of 35mil each.  Safety gap is set to just not fire with Variac at
 > 140vac. I
 > have two 100 cfm fans blowing directly down onto the gap (like a Terry
 > gap
 > where segments are epoxied onto an acylic piece).  During operation, the
 > safety gap seldom fires and the main gaps barily get warm.
 >
 > Power is two 15/30's in parallel with the Terry filter physically placed
 > right between the two.  The NST's are grounded to RF ground (stake in
 > the
 > ground) and not connected to mains ground.  On the back porch, I'm
 > plugged
 > into a 20 amp line with GFI circuit breaker and so far it pops only once
 > per
 > run; it has always randomly popped even with little load so I do think
 > the
 > circuit breaker has always been weak.  I'm currently not using PFC nor a
 > line filter.
 >
 > Next, I plan to switch to SRSG and see how much more power I can draw
 > with
 > the current power source.  Then I plan to add two more 15x30 NSTs and
 > stand
 > back :-))
 >
 > Take care,
 > Gerry R
 >
 >
 >   > Original poster: "Tom Luttrell PWRCOM" <tom-at-pwrcom-dot-com.au>
 >   >
 >   > Top stuff! That's a good looking coil too, very nicely finished.
 >   >
 >   > What were the coil specs?
 >   >
 >   > Tom.
 >   >
 >   > PS: Taking digital photos is only half the story. Post processing is
 >   > also required in a majority of cases. The first picture improved
 >   > dramatically when "Auto-balanced" by Photoshop. I'd show you the
 > results
 >   > but I can't get to my web space from behind my employer's firewall.
 >   >
 >   >  > Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
 >   >  >
 >   >  > Hi All,
 >   >  >
 >   >  > Gerry sent me these nice pics of his coil!
 >   >  >
 >   >  > Nice night picture of Jerry's coil:
 >   >  >
 >   >  > http://hot-streamer-dot-com/temp/48%20Inch%20Streamers.jpg
 >   >  >
 >   >  > 59 inch arc with witnesses ;-))
 >   >  >
 >   >  > http://hot-streamer-dot-com/temp/59%20Inch%20Power%20Arc.jpg
 >   >  >
 >   >  > Gerry with his coil:
 >   >  >
 >   >  > http://hot-streamer-dot-com/temp/The%20COIL.jpg
 >   >  >
 >   >  > Cheers,
 >   >  >
 >   >  > Terry
 >   >  >
 >   >  >
 >   >  >
 >   >  >
 >   >
 >   >
 >
 >