Re: Better performance

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

Original poster: "harry" <harry-at-prcn-dot-org> 

I have a setup similar to this but with homemade rolled poly caps and a
static gap made with 3/4" copper pipe 6" long (11 gaps at  0.22 "  per gap)
i found that mounting a pair of MO fans in a wooden box and blowing the air
between the gaps made a big difference in spark legnth , i used 1/4" copper
tube for the primary and a single 4" dryer duct toroid , this gives a nice
single spark that averages 32" and has ocasional stikes  33"-34" when using
needles as breakout and ground points and running the variac to 140 volts ,
(the kids in the neighbourhood find this boring so i put a 3" toroid on for
lots of racing sparks) I ran this coil on halloween for over an hour with
only slight warming of the transformers (2 X 12/30 nst's).




------------------------------
1          __\                   1 O                I hollowed out the
center of a scrap piece of cutting board so air could blow
1              /                   1 O                 through it , then
drilled holes near the ends of the pipe sections and screwed
1                                  1 O                 them onto the board ,
then screwed the unit on the open end of the box.
1                                  1 O
1          ___\                1 O
1                 /                1 O
1                                  1 O
1                                  1 O
1         __\                    1 O
1             /                    1 O
1                                  1 O
------------------------------









----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: December 8, 2003 5:10 PM
Subject: Better performance


 > Original poster: "Sam W." <HAZAA_69-at-hotmail-dot-com>
 >
 > I have a coil running on a 12/60 nst
 > 4.5" x 30" secondary w/21 AWG magnet wire
 > Primary:8 turns of 10 AWG insulated wire
 > Spark gap is a single static with no pressurized air for quenching
 > mmc 25 0.33 uF caps rated at 600VAC in series to make 12500VAC 0.0133uF
 > choke 200 turns 21 AWG
 > 4" flexible aluminum ducting covered in aluminum tape
 > 2" flex aluminum ducting covered in aluminum tape
 > (double toroid)
 >
 > im getting like 3" breakout, with only 9" going to a grounded pole. I
 > couldnt get any thin walled copper tubing, so i used insulated wire rated
 > at 15 kv. if i replace the primary and change the spark gap will i get
 > bigger sparks? im reading about people with similar setups getting like
3-4
 > ft. sparks. This was my first coil, and i did it for science fair. I was a
 > little dissapointed with performance. I dont want to use a rotary gap,
 > cause i cant get a synchronous motor, and asynchs will blow my nst. PLEASE
 > HELP!
 >
 >