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Re: OLTC update - A problem!
Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
John's formula is at the bottom of this page:
Ques: How long will my sparks be for a given input power?
Ans: In a well designed TC, the spark length will follow the formula:
spark length (inches) = 1.7*sqrt input power (wallplug watts)
At 05:10 PM 8/29/2002 +0200, you wrote:
>Tesla list wrote:
>> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
>> In a message dated 8/28/02 10:24:06 PM Eastern Daylight Time,
>> > With 286 watts in I should be able to get streamers of 28 inches according
>> > to John's formula. Much more considering I am not burning power in a
>> > gap. But either the low frequency (I note that I am at the frequency of
>> > Greg Leyh's Electrum which seems to come in a little low for streamer
>> > length given the input power)
>Terry, where is John's formula? Probably I have it in some paper, but I'm
>to find it.
>> Congratulations on your results so far. Regarding Greg's Electrum
>> coil, I seem to remember that it gave about the same spark length,
>> as the break-rate was increased within a certain range. Near the
>> low end of the break-rate range, the coil was quite efficient. I think
>> Greg said the coil gave almost the full spark length of 40 to 50 feet,
>> at 110 bps or so. As he raised the breakrate, the sparks became
>> bushier and fuller, but not much longer. I think it drew 40kW at
>> 110 bps or so, and gave maybe 38 foot sparks. This easily
>> surpasses what my equation predicts. This information is not
>> as Greg's website, and I may not have it 100% accurate, because
>> I gathered it from data in his various emails, but I think it's
>> close, and if I'm correct, it suggests that Greg's coil is capable
>> of very high efficiency at the lower break-rates. Maybe Greg
>> will comment further.