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RE: Where to get 4kv 20ma NST?
Original poster: "Mccauley, Daniel H by way of Terry Fritz <twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
Well now, this sounds like a fun little competetion! I've given up on
claiming the GMHEICSLR cup. 11" is the best I can manage before my coil
self-destructs (inter-turn shorts in the primary).
I'll try to dig up a 4/30 (I may have one already, IIRR, may be 6/30).
To keep it all sane, we should get a list of people willing to be
involved, choose somebody to organize and judge the results (preferably
somebody not participating), and set the rules.
>>>>>>>>>Actually, the rules are as follows:
1. You must use a Franceformer 4020SE Open Frame transformer (4kV/20mA
rated with 115VAC input and with
2. You must have a minimum of 5 shunts installed (thats minimum 5 top and
minimum 5 bottom) and operate at
input of 115VAC nominal (so no variacs which step up to 180VAC etc...)
3. Cannot be VTTC or SSTC coil
4. Maximum arc lengths are determined by setting up ground strike object
and having at least two strikes to this object for the length to be valid.
Rules will be posted on my website soon at www.spacecatlighting-dot-com
Anything else goes. This is a contest of efficiency not power, so design
will play a very important factor here.
Oh, this competition is basically for spark-gap type conventional coils,
although if one wishes to build a half-wave coil, magnifier, etc... this is
okay as long as the requirements above are followed.
We only require a 115VAC nominal input. Obviously, a person with a better
designed coil will more power at 115VAC than someone with a less efficient
coil so we do not choose to use power input as a limit.
So far, we've limited the supply to 80w input power. Wow :) Next, I
suppose we should set the rules on types of coils allowed. Is this a
demonstration for disruptive coils only, or can we get enough competition
to merit SGTC's, SSTC's, and VTTC's in there? Coils this small will be
cheap to make (caps and the transformers will be the most expensive
parts). In the interests of innovation, I'd rather set a limit on the
total input power to be 80w, as measured at the wallplug. That should not
include cooling fans for the spark gaps, etc. Just the power going to the
Maybe if there's enough interested people, we could organize a bulk-buy
of 4/20's? Perhaps get a better price, and level the playing field by
everybody using the same tranny. Then it comes down to builder's skill and
efficiency of the rest of the coil.
And we'd have to pry Terry away from his OLTC to make us a trophy ;) He
did such a good job on the GMHEICSLR trophy (which still eludes me!)
Sounds like a blast to me :))