>Arcing is a much greater problem at high altitudes. > D.C. Generator output is reduced at altitudes > above 15,000 feet due to arcing. Well: https://en.wikipedia.org/wiki/Dielectric_strength http://hypertextbook.com/facts/2000/AliceHong.shtml http://www-rhvd.fnal.gov/meetings/monday_meetings/presentations/sergio1.html Shows dielectric strength Dropping as air pressure drops, TO A POINT, then Rising as as pressure drops further. http://www.convertunits.com/from/PSI/to/torr best dwp _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla