RE: [TCML] Spark gap

["Rich Schmuke" <rdj@xxxxxxxxxxxx>]

Thank you Bart , and thanks to all the others who replied. My system is
limited to 2Kva and unless a pole pig falls off the back of a truck I think
that will be the limit for now. I have a RQ style gap with a fan and copper
couplings , 1.2 in dia. I will try the propeller when the weather lets me. I
have a transformer that is good for 4Kva ccs but it would need a voltage
doubler so low power it will be for a while. 
Thanks again.
Rich from the middle of Missouri

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of bartb
Sent: Friday, February 22, 2008 9:29 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Spark gap

Hi Rich,

Rotary gaps can process greater power than static gaps (unless you build 
a garbage rotary [and I've built at least 3 of those in the past]). But, 
the line between the two is dependent on the power capability of the 
static gap. As long as the static gap can process the power efficiently, 
there is no performance increase. However, as you increase power, there 
is a point where the static gap will degrade. Then, a rotary is 
certainly the way to go and even rotary gaps have their limitations 
based on their components.

For example, my rotary on Electrum would melt in a few seconds. But at 
10 to 15 kva on my coils works fine.

In my opinion, build good static gaps and good rotary gaps to handle the 
power. I think we all play with both types along our coiling experience. 
The propeller gap is neat in that it is an easy way to build a rotary. 
Just use good electrodes like tungsten. The larger the better. Price 
increases with size. HP increase with size also.

But static gaps can be built to perform well also. I have a nice 
G10/pure tungsten rotary but I don't use it on my smaller coil which 
runs about 3 kva. The reason I don't is that my static gap does the job 
just fine. If it didn't, I would hook up a rotary gap.

Let your coil decide what type of gap to build. How much power are you 
planning to run?

Take care,
Bart

Rich Schmuke wrote:
> I am going to ask a simple question but please give a simple answer. I am
> not a EE just a builder. I was asking about a rotor gap the other day and
it
> was suggested I try a propeller gap for my 200ma coil. Well I have a motor
> from a 8" hard drive now and am going to build a mount as soon as it is
warm
> enough to get to my shed. My question is why is a propeller at 3600 RPM
> better than a RQ copper tube gap?  60 cycle RQ  vs a 3600RPM it's the same
> break rate I think.
>
>  
>
> Rich
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
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>
>
>   

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