Re: [TCML] high break rates

[Futuret <futuret@xxxxxxx>]

Scott,

There may be an issue with the way the sparks grow in the air due to
break rate.  It seems to me that each increase in break rate gives a disproportionately
smaller increase in spark length.  My guess is that your friend's coil will give shorter
spark lengths using 1400 bps, than your coil using 700 bps, assuming the same
power input in both cases.  I'm not sure how much effect gap losses have on the
situation.  It would seem that high break rates also "steal" time away from cap
charging since there are many RF ring-downs during each 60Hz half cycle.   

John

 

 


 

 

-----Original Message-----
From: Scott Bogard <sdbogard@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Thu, Sep 23, 2010 11:36 am
Subject: [TCML] high break rates


Greetings all, 
   Has anyone done a study as to at what point your spark gap losses overcome spark growth from break rate repetition.  I ask because someone off list asked me if they could use a 40 nF capacitor on a twin MOT coil with no doubler, by my experience I get best performance (and Java TC predicts) at around 700 BPS with an 80 nF cap, so by my reckoning considering he has the same charging current and voltage, and as such will need to use twice the break rate to get sparks as long as myself, 1400 BPS seems very high though.  I told him to redesign his capacitor and primary but since he is building his own he seems disinclined to do that.  Anyway back on topic has anyone played with systems that use extreme break rates like this, and will losses overcome any performance gain?  Thanks. 
 
Scott Bogard. 
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