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Many people use a breakout point so you only get one spark, and measure to a grounded target, like a ladder. Are you measuring this way? From: Timothy Gilmore <tdg8934@xxxxxxxxx> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx> Sent: Monday, April 6, 2015 2:52 PM Subject: Re: [TCML] Tesla Coil parameters list like Tesla Map software (i.e. spark length, secondary height, # of NSTs)? I found Jeff Pennoyer's site: http://www.webring.org/l/rd?ring=teslaring;id=107;url=http%3A%2F%2Fhome%2Ecomcast%2Enet%2F%7Epennoyer%2FJeffPage%2Ehtml At the bottom there is this list which falls in line with what I was looking for on spark length: APPROXIMATE SPARK LENGTH VRS POWER INPUT CHART SPARK LENGTH POWER INPUT 6 - 8 INCHES 300 W 8 - 12 INCHES 500 W 12 - 18 INCHES 700 W 15 - 20 INCHES 1000 W 18 - 24 INCHES 1200 W 24 - 30 INCHES 1500 W 30 - 36 INCHES 2000 W 36 - 45 INCHES 2500 W 45 - 56 INCHES 3000 W 56 - 64 INCHES 3500 W 64 - 72 INCHES 4000 W 72 - 80 INCHES 4500 W 80 - 90 INCHES 5000 W So using (2) 15kv 60mA NST provides about 1850 W. I am getting at least 36 inches and many times 48 inches or more of sparks from my 6"x25" toroid: STANDARD SIZE TOROID REFERENCE CHART TORUS SIZE TORUS CAPAC. SUG. SEC. DIA. SUG. POWER LEVEL 1 X 6 in. 5.10 PF 2 - 4 in. 200 - 400 W 2 X 8 in. 6.80 PF 3 - 5 in. 400 - 800 W 3 X 12 in. 12.95 PF 4 - 6 in. 700 - 1500 W 5 X 14 in. 16.08 PF 6 - 8 in. 1200 - 2500 W 5 X 20 in. 21.58 PF 8 - 12 in. 1800 - 4000 W 7 X 30 in. 32.17 PF 10 - 15 in. 3500 - 6000 W 6 X 36 in. 37.18 PF 12 - 18 in. 5000 - 7500 W 12 X 36 in. 40.84 PF 16 - 20 in. 6500 - 10000 W 8 X 48 in. 49.60 PF 18 - 22 in. 8000 - 12000 W 12 X 48 in. 51.80 PF 21 - 25 in. 10000 - 15000 W 12 X 60 in. 63.33 PF 23 - 28 in. 13000 - 18000 W 20 X 60 in. 68.10 PF 26 - 30 in. 15000 - 20000 W Looks like my coil is exceeding these specs on spark length. I'm wondering if building a bigger toroid perhaps 8"x32" (or so) will be an overkill for only 1850W on my 2 NSTs? Tim On Mon, Apr 6, 2015 at 8:34 AM, Timothy Gilmore <tdg8934@xxxxxxxxx> wrote: > Has anyone put together any sort of a listing of others Tesla Coils built > with parameters listed such as: > > (for example): I have 2 NSTs (15kv, 60ma) each, 6" diameter, 31" high > secondary, torroid is .... > > I am getting 3-4' sparks and wondering if I should be getting longer > sparks. Is this normal? or should I add another NST or bigger Toroid > (working on an 8" diameter ducting bigger one). How do I know since the > Tesla Map software says I should get "ideally" 72.6 inch sparks and I'm > getting about 1/2 to 2/3 of that. Just wondering if it's not tuned properly > (but I think it is) - or making a larger toroid is worth the effort if I'll > gain a foot or more sparks. > > How does one know they are getting close to the best they can get in spark > length? > > I have attached my Tesla Map file of current settings. > > Thanks, > > Tim > _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla