Re: H/D Ratio

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

Original poster: "Bert Hickman by way of Terry Fritz <twftesla-at-uswest-dot-net>" <bert.hickman-at-aquila-dot-net>

Tesla list wrote:
> 
> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<Leik3-at-aol-dot-com>
> 
> Hi All,
> I have a 15/30 and my secondary is going to be 4.5 (o.d.) inches. I was
> planning on a h/d ratio of 4 leaving me with 18 inches of winding height. Any
> comments on this?? Is it too large of a ratio, will my transformer power it
> with decent results?? I haven't wound it yet, so it's not too late to get a
> smaller form if necessary.
> Thanks a bunch,
> Dennis

Dennis,

H/D ratio is not a very important consideration (within reason).
However, your coil's winding length will limit the maximum streamer
length you can get without over-volting the coil. Because of this, it
can be quite a challenge (particularly for a first-time coiler) to get
long streamers from a short secondary winding. Since you have a 15 kV
NST source, I'd recommend using a winding length of at least 21-24" to
give you some future "headroom".

-- Bert --
-- 
Bert Hickman
Stoneridge Engineering
Email:    bert.hickman-at-aquila-dot-net
Web Site: http://www.teslamania-dot-com

-- 
Bert Hickman
Stoneridge Engineering
Email:    bert.hickman-at-aquila-dot-net
Web Site: http://www.teslamania-dot-com