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Re: [TCML] 3 coil systems rotary gaps

Thanks for your opinion.
However, if the overall coupling of a 3 coils system is practically the same as in a 2 coil system that shouldn't make a difference in quenching,no?
Since this is TCBOR's and Richard Hull's advice ,and he doesn't build magnifiers with big capacitance C2 across driver (L2),like Antonio,I'm still wondering about reasons.Maybe L2 and L3  in Windgate's and Hull's designs are choosen such that overall coupling exceeds 0.25 anyway?It is quite hard to build a 2 coil system with coupling like that that operates without quenching and flashover problems.

--- cb@xxxxxxxxxxxxxxx wrote:

From: "Christoph Bohr" <cb@xxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Subject: Re: [TCML] 3 coil systems rotary gaps
Date: Thu, 28 May 2009 16:13:08 +0200 (CEST)

Hello Dex.

>From my personal hobbyist experience I can say the following:

"You need a good quenching gap" is a statement tha seems true to me.
I had small maggies run with static gaps very well, but I feel that the
high coupling from L1 to L2 makes quenching harder, especially when
entering KVA levels. Though one could argument, that the overall coupling
of the three coils is practically the same as it is in a 2 coil system.

Does it have to be the fastest quenching gap imaginable?
Certainly not. To fast is also a problem, it should match the specs of
your setup. Fast spinning makes people usually think of fast quenching,
which can but must not be true. Usually the arc extinguishes long before
the electrodes fully align. We are talking ms vs µs here....
I feel a good advice is a reasonale fast RSG with multiple gaps or
a RSG with a good blown static gap in series.
The RSG for the make, and the static for the brake if you want to put it
that way.
Another important actor is sparc loading. With a good spark from the L3,
quenching is easy, without breakout quenching will be very hard.
As in most casese, generalization is imposible. A good gap is a good thing,
but as in every setup the most important thing is, that components fit
together well. There are good simulation tools from Antonio online which
will give you exact numbers to let you decide, what your RSG should be
capable of. Properties like "very fast, "very rigid" sound nice, but
are practically worthless if you are new to the subject.
Ed Wingate uses a very elaborate ARSG in his magnifier system, a real
piece of art, but certainly beyond the common coilers abilities and
budget, after all, it usually not the lack of ideas that stop
my projects from growing, most of the time it's the lack of special
machinery or funding...
However, good luck with your project, I hope the see some
pics of it, soon ;-)

best regards

Christoph Bohr

> I heard of the following advice regarding rotary gap construction for
> maggies>
> ARSG for a magnifier should be made faster rotating and more robust than
> for a usual two coil system of the same power level.
> If this is generally true I would like to know why is that?
> My guess is it isn't a necessary requirement but it might be that
> magnifiers in practice work better than.
> Dex

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