Jim, Dennis,
Interestingly when I compared a triggered single gap, to a
two-gap rotary, I got the same spark length in either case.
However the triggered gap produced a tremendous amount
of light and noise. The rotary gave off little light or noise.
Apparently even with the tremendous light and noise from
the triggered gap, the losses were not much different than
with the rotary. Both gaps ran at 120 bps, and were installed
into the same TC for comparison. I had to set the gap spacing
at around 5/8" width, to insure that it would fire only when
triggered. Apparently a wide spacing and a lot of light and
noise do not necessarily indicate high losses.