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TC formulas, new, revised, and proposed
All,
I've changed my power vs. spark length formula to:
max spark length(inches) = 1.8*sqrt input power (wallplug watts)
This is to reflect the greater efficiency I'm now achieving in my TC.
Please note that this formula uses actual wallplug watts as
measured with a wattmeter. This formula applies only to TC's
using 120 bps sync gaps, and proper cap sizes, and toroid sizes,
and robust power xfrmers. The toroid should be sized large enough
to give only one streamer. This formula takes into account charging
losses.
For NST powered systems (120 bps sync), the old formula is still
useful:
max spark length(inches) = 1.7*sqrt input power (wallplug watts)
For TC's using 240 bps sync gaps, the following formula may be
useful:
max spark length(inches) = 1.5*sqrt input power (wallplug watts)
In a case where the actual Joule energy and wattage at the caps
has been measured, (for a 120bps system), the following formula
can be used:
max spark length(inches) = 2*sqrt cap power (watts calc from J)
As can be seen, the formula directly above (and below), ignore the
effect of charging system losses.
And finally, for 240 bps TC's, using cap wattage:
max spark length(inches) = 1.7*sqrt cap power (watts calc from J)
For even higher break rates, sync or non-sync, similar formulas
could be easily devised. Similar formulas could also be devised to
utilize wallplug VA instead of watts, or for static gap powered TC's,
etc. I'll leave it to others to develop such formulas.
The results will vary somewhat depending on a host of variables,
including the primary and secondary sizes and inductances, quality
of construction, etc. So these formulas should be considered to be
more of a ballpark figuring technique. It remains to be seen how
well these formulas will "track" at higher powers.
Happy coiling to all !
John Freau