Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net> Hi All, Bart Anderson found a weakness in the Lfac part of E-Tesla for bare coils. He used Paul's data and all to fix it. The new version is at: http://hot-streamer-dot-com/TeslaCoils/Programs/E-Tesla6.zip Many thanks to Bart for doing this!! Cheers, Terry