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5D) Primary Coils. There are two basic types of secondary, helical and spiral. Helical primaries are easy to make, but seem to require more careful adjustment of the coupling between the primary and secondary coils. They are more prone to arcing to the secondary if over coupled. As well, at higher voltage and power ratings, the turns must be of heavy gauge and spaced fairly far apart, which can make a helical primary impractical in size. Spiral primaries are harder to make, but they look really cool, and have more "grace" in adjusting the coupling. They are also easier to connect to the rest of the system. A very popular primary is a spiral of .25" soft copper refrigeration tubing. A variant on the spiral is the "inverted cone". These are a spiral primary that rises from the innermost coil to the outermost at about a 15 degree angle. I have never heard of any real benefit from an inverted cone type, but they DO look exceptionally cool. It also seems as if they must be somewhat more susceptible to streamer strikes. My take is that a helical primary (for all I said above) is great for small coils, up to OBIT powered. After that, I think it's time to go spiral. I have used helical primaries on NSTs, but they were a pain.
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The Hydrogen Fuel Cell
Electronics Stuff
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