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Re: 44 inches with 450 watt NST
Original poster: "tmoore by way of Terry Fritz <teslalist-at-qwest-dot-net>" <tmoorezz-at-adelphia-dot-net>
Dear Captain,
Yes I do have pictures of the coil running they can be seen at
http://hot-streamer-dot-com/nolan/threeintc/
the transformer I was using was a
7.5/60 depotted franceformer, and it was modified. Some of the shunts were
removed to achieve 87mA output so that it would match the capacitor and
resonate bring the voltage and power up. The transformer draws around 10
amps of current when running the tc due to resonance charging effect, so I
should be getting around 60in spark according to that formula. Also I was
guesstimating the distance from 40-44in see the metal crutches were actually
40in away from the break out point and sometimes the streamers would strike
up near the top of the crutches adding a few more inches.
Sincerely,
Nolan Moore
--- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, March 07, 2003 5:10 PM
Subject: Re: 44 inches with 450 watt NST
> Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<dhmccauley-at-spacecatlighting-dot-com>
>
>
> Wow. 44 inches. That blows the John Freau spark length formula out of
the
> water.
> And to think you did it with a 7.5kV/60mA transformer.
>
> Do you have any pictures of this coil in action???
>
> The Captain
>
>
>
> > I would say that a 44 inch spark with a 450 watt NST is very good
output.
> > However, if you want to fool around with the "what if's" you may want
to
> use
> > the JHCTES Ver 3.3 computer program.
> > This program automatically does the calcs to keep all the parameters in
> tune
> > when you make changes. The program is used on line and does not have to
be
> > downloaded. Click on
> >
> > http://www.mgte-dot-com
> >
> > Click on "Tesla" then "JHCTES",
> > Click on the JHCTES Ver 3.3 program at the bottom of the Book page.
> >
> > Start with the following inputs
> >
> > Primary .0302 uf, 5.5, 0, 4.43
> >
> > Secondary 1.75, 1233 turns, 71.25, 0, 26.4 pf
> >
> > These inputs will give you the outputs you have described, like 176
KHZ,
> > etc. Changing the inputs will give you dozens of other TC combinations.
> The
> > TC system will always be in tune with the outputs that are shown by the
> > computer.
> >
> > John Couture
> >
> > -------------------------------
> >
> >
> >
> >
> >
> >
> >
> >
> > -----Original Message-----
> > From: Tesla list [mailto:tesla-at-pupman-dot-com]
> > Sent: Friday, March 07, 2003 2:07 PM
> > To: tesla-at-pupman-dot-com
> > Subject: New three TC finished! but i need some help
> >
> >
> > Original poster: "tmoore by way of Terry Fritz <teslalist-at-qwest-dot-net>"
> > <tmoorezz-at-adelphia-dot-net>
> >
> > Hello Everyone,
> >
> > Well I finished a new coil, it is a 3in system that runs on a
> single
> > depotted 7.5/60 francfomer, it used to be one of the transformers with
> > ground fault protection. I use my new PSU its noting fancy just a
variac
> > with a few switches. Well I need some help again I have been trying to
> > figure out were to tap the primary coil by visual observation of
streamer
> > length and behavior and it is quiet perplexing. My problem is I think I
> > have to much topload for break out, see when I taped the coil -at- 9.25
with
> a
> > break out point it produces long bright strikes to near by pair of
metal
> > crutches. Now when I remove the break out point the tesla coil wont
run
> > even at full power, then I need to tap it around 7.5 turns to get any
> break
> > out from the toroid, and there are allot streamers that are
short(around
> 1.5
> > feet) very pail, with the break out point I get 40-44 inch sparks
> regularly
> > to the crutches. Now Ed Sondermans Tesla Cal says it needs to be taped
> > around 10 turns. I think when I taped it -at- 9.4 or beyond the sparks
> > shortened and then will stop when tapped around 9.6turns. Ok how do you
> tune
> > by visual
> > inspection?? Is it in proper tune when the break out is on but there
are
> > streams COMING off the toroid on a few random places despite having a
> break
> > out point were most of the streamers go, also streamers not quite as
> bright
> > when they strike the crutches?? OR is it in tune when streamers only
come
> > from the break out point and are slightly more intense when they hit
the
> > crutches and slightly more frequently?? I REALLY would appreciate if
some
> > one could answer those question and describe exactly how to determine
> > whether the coil is in tune by visual observation of streamers.
> >
> > Here I'll give you a run down of my coils specs.
> >
> > Topload
> > Two toroids made from flexo Al ducting
> > #1=19in wide by 3.375in across for 19.83pF
> > #2=12in wide by3.375in across for 13.35pf
> > So then what's is the total?? Its 33.18pF CORRECT???? That's a question
> > cause am not sure!
> > There spaced aprox .5in away from the top and bottom of each other btw
the
> > smaller one is on the bottom.
> >
> > Secondary
> > Length=17.25in wound with 28awg enamled wire
> > Diameter= 3.5in pvc pipe coated with polyurathane
> > L=24.7mH (Measured) That makes it 71.25 turns per inch
> >
> > Primary
> > IND=6.5in
> > OD=15.375in
> > Spaceing=Turns out to be around .29 on average between turns
> > Wire= 0.162in
> > Max turns=10.125 Measured 32uH max but Calculated its 34.2uH i think my
> New
> > DMM is off cause the lowest seting is 2mH
> >
> > Capacitor= Maxxwell pulse rated 35KV at 30nF Measued value=30.2nF
> > With a satfey gap set at 0.28125in wich fires ocasonaly
> >
> > Spark Gap
> > Spaced total 0.1875in with 3 gaps and 4 copper pipe peices 2in wide by
> > 1.125in diamither enclosed in a box fabricated from plastic cuting
board
> > cooled by a 3in fan
> >
> > Transfromer
> > Depotted Fance modified for matching to the capcitor, Some of the
shunts
> > were removed, and i actualy submerged and soaked the tran in semi-gloss
> > polyurathane then let dry several times
> > I out=87.8mA
> > When the tesla coil is runing the amp meter waves backanforth between
> > 8-13amps
> >
> > Ok i have tryed to figure out were to tap the primary coil by
puting
> > figures in to the formula F(KHz)=1/(2*pi*(sqrt(L*C))). When I put in
the
> > numbers for the secondary with out the adding on the self capacitance
of
> the
> > secondary only the topload I get 176.17KHz secondary resonance, and
when I
> > change the figures for the primary coil to match the secondary I used
the
> > figures 30.2nF for the tank cap and it would take 27uH to match the
> > secondary. According to Ed's tesla cal it would take 9.03 turns to get
> 27uh
> > of inductance, also it says I would need to used a 41nf tank capacitor
> witch
> > is not the value of mine, so what is going on? Also according to Ed's
> tesla
> > cal I would need 10.4 turns to match my 30nF capacitor, which is bad
cause
> I
> > only have 10.1 turns max and when I tap it there it doesn't even
resonate
> > and the spark gap wont fire, id have to say it appears to operate best
> when
> > tapped from 8.6 turns to 9.25 turns. Is this because of my topload?? Is
it
> > too bigg?? or is it that there is some formula to figure out the total
> > capacitance of the two toroids?? Like would it be the average of the
> series
> > and parallel values?? So could some one help me!! I would like to have
it
> > in perfect tune before trying to maximize the spark length.
> >
> > Also I was wondering if there is a formula to figure out the
voltage
> > need to breakdown across the space in the spark gap, so that I know
what
> > voltage the spark gap will fire at regularly. So far this system has
been
> > very
> > agreeable and well behaved, there have been no racing sparks or
secondary
> to
> > primary strikes, and streamer length and power is quite impressive. I
have
> > also taken some terrific pictures Ill post some of them in a folder at
> > http://hot-streamer-dot-com/nolan/threeintc/ I really need some help on
this
> so
> > I appreciate your help greatly. Thanks.
> >
> >
> >
> > Sincerely,
> >
> > Nolan Moore
> >
> >
> >
> >
> >
>
>