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*To*: tesla-at-pupman-dot-com*Subject*: Re: Spark length formula and NST's, was ^^(my) First Light ^*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Sun, 27 May 2001 12:53:33 -0600*Resent-Date*: Sun, 27 May 2001 13:12:54 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <fbWa2B.A.ncG.zGVE7-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com> In a message dated 5/26/01 4:18:49 PM Eastern Daylight Time, tesla-at-pupman-dot-com writes: > > Hello, everyone > > > > 45"?? didn't he say he had a 12/60? I thought the max u could get with a > > 12/60 was 36"?! Maybe I'm wrong, what is the formula for that again? I > > think > > it was John Freau's Formula... > > > > --------------------------------------- > > Jonathon Reinhart Jonathon, One must consider that an NST can draw a lot more than its rated power. Much more than 36" can be obtained from a 12/60. I get 42" from a 12/30 NST. Gary Lau gets 61" from a 15/60. The key is that an NST can draw a lot more than its rated power if resonant charging is used, or if a 140volt step up type variac is used to power the coil with an LTR cap. My formula is meant to be used with the *actual* input power, not the NST rated power (not with the VA either, since non-pfc'd NST's may draw a lot of current, much of which does not translate into true power). The formula is: spark length inches = 1.7*sqrt input power (wallplug watts). My 12/30 NST is rated at 360 watts. But with a 0.015uF cap for LTR, and using a 140V step up variac to power the coil, it draws 620 watts, (VA is a little higher using PFC). It gives 42" sparks. 1.7*sqrt 620watts = 42.3 inches John Freau

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