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Re: [TCML] Pig based coil design.
I can turn on my TC and measure the output sparks using a typical RQ spark gap with a 4" box fan.
Then I can swap out the RQ gap with the 4" box fan for my variable speed vacuum fan RQ spark gap then turn on the TC. As I turn up the speed of the fan I can see the output sparks get longer and longer. When the fan reach a certain speed the sparks do not get longer. If I speed the fan up faster the sparks start to get shorter. There is a fan speed where it is very visible that the sparks have reached maximum length. I have taken measurements and the sparks are always at least 5% longer some times more.
I have a variable speed vacuum fan spark gap on a 4" coil, 6" coil and my 10" coil. The same spark gap works on all the coils from 450 watts to 15KW.
The output on my 10" TC is 12 foot streamers to a target. I can change the speed of the fan the output gets shorter. With the typical RQ spark gap with a 4" box fan the output is about 10" 6" so I am getting an extra 18" of output with the variable speed vacuum fan spark gap.
I have noticed I get my best output when the humidity in the air is very low.
I have built 2 different styles of variable speed vacuum fan spark gap and the both work fine.
I will see if I can take some pics and upload them to photobucket and post the links here. My son has a very large pile of auto parts stacked up in from of my TC stuff that I have not used in several years. If I can get to the spark gap and connect it to a TC I might even be able to get a video and upload it to You Tube. Today I am working on the camper and tomorrow I have another project to deal with so it may be a few days before I get around to the spark gap.
Gary Weaver
-----Original Message-----
>From: Quarkster <quarkster@xxxxxxx>
>Sent: Nov 8, 2009 12:56 PM
>To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
>Subject: Re: [TCML] Pig based coil design.
>
>Gary -
>
>Two questions:
>
>1. You stated: "The variac tunes the spark gap to the exact speed to get
>maximum output."
> By "exact speed" you mean airflow rate, correct? There is no rotary
>spark gap, and the only variable is the amount of air passing throiugh the
>static spark gap?
>
>2. By "12 foot arcs", you mean single arc channel or streamer, from topload
>to some other object, and not two simultaneous six-foot arcs from each side
>of your topload? In your photo, it looks like the coil is generating two
>simultaneous 5-6 foot arcs from each side of the spherical topload.
>
>Regards,
>Herr Zapp
>
>
>
>----- Original Message -----
>From: <gary350@xxxxxxxxxxxxx>
>To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
>Sent: Saturday, November 07, 2009 3:05 PM
>Subject: Re: [TCML] Pig based coil design.
>
>
>> Ok.... what exactly are you looking for. Plans you can copy?
>>
>> Here is a link to my 10" coil. Secondary is 950 turns of #18 enamel
>> coated copper wire close wound on a 10" diameter PVC pipe. Secondary coil
>> has 3 coats of polyurthane. Primary coil flat would 1/4" copper tubing
>> 1/2" spacing with strike rail. Variable speed vacuum fan RQ spark gap.
>> Capacitor is .035 uf 40K volts. The coil produces 12 foot arcs on about
>> 12KW at 14,000. volts. The variac tunes the spark gap to the exact speed
>> to get maximum output. I can dial in about 1 extra ft of output arc
>> length with the spark gap vacuum fan speed control.
>>
>> My suggestion is forget the rotary it is just a fancy over priced toy.
>> Build a variable speed vacuum fan spark gap.
>>
>> http://home.earthlink.net/~gary350/tc10-4.jpg
>>
>> I have a 15" diameter PVC pipe you can have it FREE if you come and get it
>> in Murfreesboro TN 37129. I have a truck load of other diameter PVC pipe
>> 6", 8" and 10" it is all free to anyone that will come and get it.
>>
>>
>>
>>
>>
>>
>>
>> -----Original Message-----
>>>From: Travis Tabbal <travis@xxxxxxxxxx>
>>>Sent: Nov 5, 2009 10:58 AM
>>>To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
>>>Subject: [TCML] Pig based coil design.
>>>
>>>I was wondering if someone had a JavaTC file they would be willing to
>>>share
>>>for a chicken based coil. I was thinking secondary diameter in the 12"-24"
>>>range. The chicken is 14.4Kv 10KVA. The gap will be rotary, not yet
>>>designed.
>>>_______________________________________________
>>>Tesla mailing list
>>>Tesla@xxxxxxxxxx
>>>http://www.pupman.com/mailman/listinfo/tesla
>>
>> _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>
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