As the disk turns it will make contact with the
bushings and complete the tank circuit, dumping loads of power into
the primary. The obvious problem with this is it will arc before it
rolls over the contact defeating the whole purpose, but my thinking
is you could use a smaller rod to increase "quenching" and submerge
the whole thing in mineral oil to keep stuff cool and cut down on
spark, but you will need a really tough motor. Has anybody out there
tried this already? would there be any benefit?