[TCML] Is my understanding correct?

["P Tuck" <follies@xxxxxxxxxxxx>]

JavaTc is a great tool, but the trouble is you can play around just a little
bit too much! For newcomers, like myself,  that can be a headache.
In my case the archives have given a wealth of info on building tips, and
'desirable' qualities that I "think" my first coil should have, allowing me
to come up with 4 differing designs in JAVATC.

I'm using a 10K / 48ma NST with CD 942C20p15K caps ( LTR - 0.02143 uF) both
of which I have already got. Also a static single gap (I have a lathe & mill
etc so it will be hollow electrodes either sucking or blowing with a vacuum
cleaner motor as in the recent posts on that subject)

My quandary is that using a 4 inch coil and depending on what design I
adopt, I can achieve between 181 to 236 KHZ Res Freq with differing
Inductance values.

The 236 freq' would have a Primary of  20.5 uH and the 181 would work out to
35 uH - a considerable difference. Both have a Q around 255 (260 & 247) so
not much to choose from there.
As I understand things a lower freq and higher Prime Inductance are better
if you prefer a solid discharge (I'm only in the 2 to 3 foot range - I
realise that)  rather than lots of 'bushy' sparks. 

My other 2 designs fall in between these extremes.

All the designs use either AWG 26 or 28 and all are in the 1000 to 1500
turns range.

But.......IF the NST is suitable for a 4.5 inch coil I have a 5th design
where I can get a slightly lower freq (162) and a slightly higher Pri and
Sec Inductance.

Obviously everything is a trade off, one 'desirable' quality against
another, but what qualities should I really be the most concerned about
aiming for, using a modest sized NST? 

Some points to bear in mind are:-

All coupling Coefficients are around 0.12 to 0.13 and all the recommended
primary distances to sec' coil are acceptable

Longer run times are favoured against shorter ones

So finally my Questions are:-

1)  Desirable Freq, (high or Low) to give the caps an easier time

2)  Prim Inductance, High or Low to get down gap losses, come to that, what
is High or low on a coil this size ? ? ?

3)  Aspect ratio:  (4 to 5:1 I know that) BUT one design (the lowest at 181)
uses a 5.5:1 -  is this ratio pushing it a bit?

4) Can a 10K/48ma NST power a 4.5 inch coil (as opposed to the norm of a 4
inch for this NST)

Thanks hopefully in advance

Regards
Philip 



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