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Re: Sparklength inquiry
Well Malcolm, All,
I tried Greg and John's data with my little "goofy"
equation. The sparkgrowth did follow both when graphed,
but only to a point. Not too long and my values went way
out in no-mans land again. I kind of figured this would
happen. What appears really difficult in a sparkgrowth
equation is;
1) what is the max length
2) why is it a max length
3) what unit (whatever) is crossed which begins to
decrease length
Far beyond my startrek approach. Hopefully, you guys who
really understand your math can come up with a near-miss
equation for sparklength for non-controlled (in-air)
sparks and the relationship to BPS. I'll be listening. I
do think however, maybe we should be looking at
sparkgrowth and it's relationship to ion lifetimes and
how energy levels change ion lifetimes to work this out.
I think were missing data which can only be obtained via
specific tests we have yet to do on our systems. This is
where physics majors can really play a vital role. How
about it all you physics gods?
Bart
Tesla List wrote:
>
> Original Poster: "Barton B. Anderson" <mopar-at-uswest-dot-net>
>
> Tesla List wrote:
> >
> > Original Poster: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
> >
> > Hi Bart,
> >
> > > Original Poster: "Barton B. Anderson" <mopar-at-uswest-dot-net>
> > >
> > > Greg, John -
> > > My appologies. I did screw up the equation when I first
> > > posted as I did with the Vs equations. Must of been a
> > > bad typing night. John, I usually represent your
> > > equation in my spreadsheets as sparklength =
> > > (Vs*1000/65)^1.43 = (KVs/65)^1.43. I apparently hit the
> > > / instead of *. Sorry.
> > >
> > > As you stated, this is purely emperical and probably the
> > > best out there I know of. You also stated it can be
> > > related to breaks and power, however, I'm getting some
> > > wild numbers way out there using both equations. I
> > > assume there's a step or two missing to calculate
> > > sparklength?
> >
> > Running through that formula suggests to me that it is a passable
> > indicator of sshot lengths only. Invalid for repetitive operation.
> >
> > Malcolm
> > <snip>
>
> Yes, your right. This is how I interpret John's formula
> (controlled sparks) as I think it is intended and
> nothing more. Thanks for pointing this out as I did not.
>
> Also, I have been playing again with equations
> (dangerous, I know). I have found that using the
> equation
>
> P = .5*Cs*Vs^2*bps
>
> and then using P / Vs * (BPS^2) gives values similar to
> sparkgrowth. Of course there is no direct path to
> sparklength and inches or centimeters as it's a current
> equation, but it is interesting how the product of this
> equation does simulate spark growth. I have tried it at
> high breakrates (400 to 800) and the product isn't way
> out in no-man's land, actually it's probably under what
> is really achieved. I'm going to run some of John and
> Greg's numbers tonight and see how this sparkgrowth
> equation corresponds to their posted power tables. If
> you try the simple equation, you'll see what I'm talking
> about. I know it may mean nothing, but it interesting to
> contemplate the significance sparkgrowth and try to
> reason it out (of which I haven't done yet).
>
> Bart