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Re: Coupling

Original poster: DRIEBEN@xxxxxxxxxxxxxxx 

Hi Mike,

With your lowermost secondary 2.5" vertically higher than
the flat plane of your primary, yes, I would try decreasing
this spacing by about half and see what happens. Generally,
optimal coupling is achieved by placing the lowermost turn
of the secondary 1" to 1.5" above the plane of the primary
coil. This will probably give you a notable increase in your
output, so long as you don't overcouple and get racing sparks.

David Rieben

----- Original Message -----
From: Tesla list <tesla@xxxxxxxxxx>
Date: Monday, November 14, 2005 12:03 pm
Subject: Coupling

> Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>
>
> I know that tweeking these coils is how we figure this stuff out,
> but
> getting educated opinions doesn't hurt. I finally got to fire up
> my new coil.
>
> 6" O.D. sec., wound for 32", about 1000 turns
> 3/8" cu tube, spaced 3/8" for 10 turns
> sucker gap
> right now 30 nF 35 KV maxwell
> 14400V PT running @ 1800 W -125 MA
>
> I'm not getting the performance I expect. Right now about 52"
strikes.
> I suspect the coupling may be a little loose. The first turn of
> pri.is 1-1/4" from sec, and first turn of sec. is 2-1/2" above the
> pri. Tomorrow I may try to find some longer nylon screws, and
> raise
> the primary.
> So what do you think, am I too loose? Should I bother doinng this?
>
>
>