Hey Lynx, have you seen skycollection on you tube? He uses a bifilar pancake coil to loop back and charge the supercaps that are driving the circuit. That's the ticket, the only problem is the output of the Rodin coil has such high voltage and the super caps are very low... 2.4 or so I believe. High frequency transformer? I have ordered a bank of em in series so I'll have 12v to play with. Also ordered a square wave generator that works @ 12v Hmmmmm there must be a way!
Nobody wants to break any rules.... Just bend them a little
I checked out Skycollection on Youtube and if it's the right one he has a few clips of Russ and also of various coils, etc (Eric Schildt, is that correct?).
Charging supercaps does take quite the current initially, so when they're totally discharged they will act more or less like short circuits, so don't be too surprised if you find the DC voltage to be zero for quite some time measured right after the diode bridge feeding the caps.
Also, keep in mind that the resulting capacitance from capacitors connected in series will decrease, all according to the standard way of calculating capacitance, such as found here http://www.allaboutcircuits.com/textbook/direct-current/chpt-13/series-and-parallel-capacitors/
On the other hand you will increase the voltage the cap bank will be able to withstand when you connect caps in series, so there's, sort of speaking, a win win situation that way as you both decrease the resulting capacitance, leading to lower overall charging current for the cap bank, while you at the same time increase the voltage it could be subjected to.
Should you feel the need to limit the cap charging current then a simple power resistor would do just fine, then you could perhaps even find a way to use the excessive heat developed in the resistor due to the relative high cap charging current, instead of having it going to waste ;-)