These are the longest sparks of 11 feet that I have had with this Tesla coil on domestic power. They only happen occasionally though. (something about the 3 longest sparks looks like a T. rex).

This is a run with everything maxed out. The spark gap was running at its optimum of 400 BPS and the series blower gap was on full. I had a total of 0.11 uF of tank capacitance. I tuned things by hand and with the tuner to 36 kHz. The variac was on full and no ballast. No idea what the current draw was. I imagine 30 A plus. I have a tape measure on the ground which was only really countable in the high res photos but was set at 11 feet. The secondary winding length is 52 inches which gives a ratio of spark to secondary length of 2.3 which is fair enough.

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Photo Date:  September 9, 2007