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Re: New System, was "Real Data--
Do local ordinances allow for a circus tent like temporary
enclosure? If it had enough peak to it then It could be
left up all winter. Just curious.
Barry
----------
|From: "tesla-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|To: Benson Barry; "Tesla-list-subscribers-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|Subject: Re: New System, was "Real Data--
|Date: Wednesday, November 20, 1996 1:35AM
|
|<<File Attachment: 00000000.TXT>>
|From Esondrmn-at-aol-dot-comTue Nov 19 21:53:40 1996
|Date: Tue, 19 Nov 1996 13:58:28 -0500
|From: Esondrmn-at-aol-dot-com
|To: tesla-at-pupman-dot-com
|Subject: Re: New System, was "Real Data--
|
|In a message dated 96-11-16 03:14:31 EST, you write:
|
|<<
| Hi Ed:
| Right now I am trying to sort through several alternatives associated
| with my winter project. Yes, it is a two coil system and I have a 10
| KVA 14,400 VAC pole pig, welder ballast and Superior 1256D variable
| transformer in the supply. Last night I decided to change the secondary
| to a 56" length with the 15.25" form diameter in order to get a bit
| lower in frequency. This results in a resonance of about 106 Khz
| without a toroid. My curiosity at this point centers about picking the
| optimum capacitor size, with maximum spark being the goal. I originally
| thought a .1 mfd cap would be about in the correct range, but alot
| depends on how far the secondary resonance will drop with a proper
| toroid, if an ideal L/C ratio is a target. I'm still not clear on what
| the proper L/C ratio might be. My 8" diameter by 28" long coil had a
| 221 Khz resonance and with the 48" toroid it dropped to a measured 94
| Khz. If I could expect the 106 Khz resonance of the new secondary to
| drop to around 50-55 Khz with a big toroid, I would have a primary
| needing about 100 uh with the .1 mfd cap. O.K., I guess I could just
| slap a random choice cap size in there and hope for the best, but
| another option makes more sense to me. That option is, we have a
| tremendous amount of experience in this group and I sure don't mind
| listening for a few weeks and filtering out the stuff that will help me
| get a notch closer to the best I can personally do (The real story is, I
| sure don't want to spend $450-$600 on a cap that isn't quite right!).
| My last primary had 15 turns so I have no problem with a similar design
| here. I will use 5/8" thin wall copper refrigeration tube, if they make
| it in that size! Haven't checked yet.
|
| I am planning on using the 12" diameter flexible aluminum air duct for
| the toroid perimeter. I used the same type of stuff but in 6" or 8" on
| the other coil and was happy with the results. I figure on a 60"
| diameter for this one. Yea, I guess I'll need lots of power to get it
| to break out. I have room for a few more breakers downstairs and the
| next one will be a 100 amp line out to the Tesla area, or that spot my
| wife calls the drive way. Silly, she thinks she will be able to use the
| garage next year!
| I got a couple of parts made today for my winding system for the
| secondary. I should have the PVC form mounted up and getting close to
| winding this next week. I am getting a gear reduction drive unit
| coupled to a shaft and support system to hold the form while winding and
| then I'll coat it with the Behr Super Build 50 polyurethane varnish--I
| really love that stuff! I will take photo's so that when it's 10 below
| zero here I can have something to look at and wait for spring. As
| always, I appreciate any ideas and comments. Thanks in advance!
|
| Chuck Curran
| Cedarburg, WI >>
|
|
|Chuck,
|
|This sounds like a super system. It should perform very well. I agree
about
|the capacitor, for that kind of money, you don't want to be too hasty.
|
|I also am relegated to operating only outside on the driveway - having
|outgrew the basement and the garage. I sure wish I had a nice large heated
|building to set all this up in. I made good progress when I had the coil
set
|up in the basement. Every night after work I could experiment and leave
|everything set up for the next day. Now it is a big job to get it all set
|up outside to run it - depending on the weather of course.
|
|Ed Sonderman Spokane, WA
|