Re: SSTC Twins UPDATE :30" goal met

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steven Ward" <srward16-at-hotmail-dot-com> 

Hi,

i surpassed the 30" goal by 1" today :)  The coils are just amazing to see 
in person.  I will add a video after i get it compressed.  For now there 
have been some nice pictures added.  All pics were at the 31" 
point-to-point distance from the discharge points.  Enjoy!

Steve Ward


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: SSTC Twins
>Date: Mon, 01 Sep 2003 02:20:16 -0600
>
>Original poster: "Steven Ward" <srward16-at-hotmail-dot-com>
>
>Hi All,
>
>Ive been working intensly on some SSTC twins.  For a brief history, look 
>at my site :
>
>http://hot-streamer-dot-com/srward16/
>
>http://hot-streamer-dot-com/srward16/SSTC4.htm
>
>Ive basically come a very long way since i started this project.  I 
>managed to kill 4 big mosfets from reasons unkown, but i suspect poor 
>tuning with my free running oscillator.  Now im back to running small 
>Mosfets, but lots of them!  Im using a dual H-bridge of IRFP260s.  At 120V 
>input and just over 15A i get some nice 26" sparks between coils.  28" is 
>my current best spark.  I also got an antenna driven feedback method to 
>work very will with the twins.  This is the key to the long sparks, the 
>coil is always in tune.
>
>Now ive got a question about twin coils.  Can the secondary coils be out 
>of tune?  Im running the bases together, but NOT grounded.  I figured, if 
>there was any error in Fres between the coils, the lack of ground would 
>compensate.  Can any one explain how twins (in my situation) work as far 
>as Fres...  My feedback can only tune to one coil, so is my other driver 
>simply always going to be slightly out of tune?
>
>Another note, anyone going to the cheesehead teslathon this saturday can 
>(hopefully!!!) look forward to seeing the twins doing maybe some 30" arcs.
>Im etching the final PCB on tuesday and if it works like it should, the 
>coil will be ready for action.  I cant make any promises though...
>
>Any comments or questions are WANTED ;)
>
>Steve Ward