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Re: synchronous RSG or not



Then you're using a fairly large cap size (.075uF). This does support Gary's
post. I think he pointed out something we tend to overlook at times. 

Bart 

Tesla list wrote: 
>
> Original poster: "D.Wightman" <dwightman-at-mmcable-dot-com> 
>
> im sorry that i had forgotten to give more of the specs of the coil...i am 
> using 2 maxwell 15kv  .15  caps in series,  also a miller welder with a 
> variable shunt,, "a hand crank knob that raises or lowers the core to the 
> transformer in the welder instead of a selector switch" it is running in my 
> airplane hanger which has limited power to it ..so amperage was at the most 
> 28 amps,, but the voltage will drop to 189 volts..ya i know,,,im at the end 
> of a long row of hangersalmost 200 feet from the power supply to the 
> building, and it is wired with #12 wire, yes it gets warm...the voltage drop 
> is most likely whats saving the caps since with 2 im rated at 30 kv,,,im 
> getting 1 more..... 
> -----Original Message----- 
> From: Tesla list <tesla-at-pupman-dot-com> 
> To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com> 
> Date: Sunday, July 30, 2000 3:15 PM 
> Subject: Re: synchronous RSG or not 
>
> >Original poster: "Barton B. Anderson" <tesla123-at-pacbell-dot-net> 
> > 
> >Interesting observations. 
> > 
> >An SRSG at 120 bps can be phased to fire at each peak of the AC 1/2 cycle. 
> One 
> >can also run SRSG's at 240, 480, etc.. bps rates, but I doubt an SRSG gap 
> rate 
> >above 120 will show any improvement (probably a loss of spark length). You 
> have 
> >demonstrated what is "nice" about a DC drive spark gap. With DC, varying 
> the 
> >break rate is simple and odd things do occur at different rates of the 
> break. 
> >Although I run an SRSG currently, I have ran DC and I loved being able to 
> >adjust the break rate while the system is running. My particular coil had 
> >longest arc lengths at around 270 bps at that time (I didn't try extremely 
> high 
> >rpm though). 
> > 
> >I am curious however, what size capacitor are you using? 
> > 
> >Tesla list wrote: 
> >> 
> >> Original poster: "D.Wightman" <dwightman-at-mmcable-dot-com> 
> >> 
> >> Recently i ran my 8 inch coil at various speeds on my rsg. it has 6 
> rotating 
> >> electrodes and 2 fixed electrodes,the drive motor is d/c with a built in 
> >> tachometer..The coil is powered by a 14400 * 5kva pole pig..the rpms were 
> >> from 
> >> 1000 to 5000 rpm...all of this is on video tape which is 30 minutes 
> long..an 
> >> interesting phenomona happens..at fairly low power levels and slow rpms 
> the 
> >> coil will function very well it was easy to get 5 foot ars, by turning up 
> the 
> >> 
> >> rpm of the rsg at this point there is no visible improvement in 
> performance.. 
> >> 
> >> when you turn the power up to the coil it would tend to want to arc down 
> the 
> >> secondary, and also hit the secondary..by increasing the rpms of the rsg 
> at 
> >> this point it would seem to go back into tune and the destructive arcing 
> >> would 
> >> stop..at this point you can really crank up the power to the pole pig and 
> get 
> >> 
> >> nearly constant 8 and one half and 9 and one half foot sparks.. this 
> >> secondary 
> >> coil is only 25 inches high!!!! now upon further experimentation...at 
> full 
> >> power..rsg at 5000 rpm 10 foot sparks super hot, hitting a metal support 
> beam 
> >> 
> >> for building we would begin to adjust the speed of the rsg..down at 
> approx 
> >> 2000 
> >> to 1000 rpm the destructive arcing would propagate..arc length was 
> effected 
> >> by 
> >> at least 10 to 15% "reduced arc length"..at 700 to 1000 rpm you would see 
> >> white 
> >> hot spots on the secondary coils,by turning the rsg at that point 
> immediatly 
> >> back to the 2500 to 3500 rpm range the hot spots went away and the unit 
> was 
> >> really getting with the program. at that point the rsg was turned up to 
> >> around 
> >> 5000rpm, it seemed that power output was slightly reduced maybe 5 %... 
> >> unfortunatly this experimentation has destroyed the secondary but the 
> results 
> >> 
> >> are very interesting for those of you who would like a copy of the tape 
> let 
> >> me 
> >> know.. in the end, you will see it with lots of smoke pouring out of the 
> >> secondary and a small fire .....these things are GREAT...now for the 
> question 
> >> 
> >> one must ask...why do most perfer synchronous rsg's?? what is the point.. 
> it 
> >> did seem that a spark gap can be tuned for a specific power level....does 
> >> synchronous operation tend to mostly protect the caps or the 
> >> transformer.....i 
> >> realize that the 60hz a/c cycle can be optimized, sort of,, by selecting 
> a 
> >> rpm 
> >> on a rsg that tends to "hit" at the peak of each cycle...but i really did 
> not 
> >> 
> >> see this..thanks everyone. 
> > 
> > 
> > 
> >