Re: [TCML] Why don't big Tesla coils use helical primaries?

[Jim Lux <jimlux@xxxxxxxxxxxxx>]

On 8/31/11 10:24 AM, mrapol@xxxxxxxxxxxx wrote:
> I've wondered why helical primaries aren't common in medium to large
> coils too.

They are used.. I think that adjusting the tap point on a pancake is 
easier, though.  (for mechanical reasons, not the procedural difficulty)



> Can't over-coupling be moderated by enlarging the diameter of the
> primary, or by using a more insulating coil form?

Yes.. you can make the primary larger in diameter, or lift the secondary.

Insulation doesn't change the coupling.

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