Re: Racing Sparks

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "david baehr" <dfb25@xxxxxxxxxxx>


At the risk of repeating myself , which I am , has anyone here try 
'creepage disks' to solve this problem ?...just wonderin'....


From:  "Tesla list" <tesla@xxxxxxxxxx>
To:  tesla@xxxxxxxxxx
Subject:  Re: Racing Sparks
Date:  Wed, 03 May 2006 07:11:05 -0600
>Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
>Hi Jared,
>
>Oops, I just thought of one more cause:
>
>1. Too much power for the coil size.  Topload voltage is too high
>for the coil height.  Probably requires a topload that is too large
>and breakout doesnt happen soon enough.
>
>2. Too much coupling. The energy coupled into the coil is more
>concentrated
>in the lower turns and less spread out resulting in an energy wave
>propagating up the coil that causes too much stress between
>windings.
>
>3. Out of tune.  This can result in exitation of the higher resonant
>modes
>that can cause a voltage node at an intermediate position up the
>coil.
>
>4.  Topload is too small allowing for greater exitation of the
>higher
>resonant modes.
>
>5.  Bang energy is too large for the coil size.  This results in an
>energy wave that is too large.  Sorta related to #1 and the same
>mechanism as #2
>
>Gerry R..
>
>
>
>>Original poster: Jared E Dwarshuis <jdwarshui@xxxxxxxxx>
>>
>>It is possible to get racing sparks without tight coupling. Larry
>>and
>>I deliberatly made a 1.5 wave coil with a centered primary that had
>>no
>>top end capacitors. What we found was racing sparks that existed
>>only
>>at the quarter wave sections at the ends of the coil.(It looked
>>like a
>>fiery Q-Tip).  When we added secondary capacitance the racing
>>sparks
>>disapeared.  (Draw your own conclusion!)
>>
>>I have noticed that tightly coupled coils are fussy about tuning.
>>They
>>want the primary to be tapped in just the right place, and the
>>spark
>>gap needs carefull tweaking. Lose coupled coils are more forgiving
>>about tuning.
>>
>>Jared Dwarshuis
>>
>>
>
>
>
>