Re: Coupling

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>

No, the primary is flat. I meant the center of the tubing (3/8").
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, January 06, 2006 12:09 AM
Subject: Re: Coupling


> Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
>
> Hi Mike,
>
> Sounds like it's doing well.
>
> You mentioned:
> "I'm getting my best results with the bottom of sec 1" above the
> center of the pri."
>
> "center of the primary"? I wonder "is your primary conical?
>
> I didn't get that from your data. I assumed a flat spiral primary. If
> it is conical, could you send specs my way if you get the time? I'd
> like to take a second look.
>
> Thanks,
> Bart
>
>  > > > >6" O.D. sec., wound for 32", about 1000 turns
>  > > > >3/8" cu tube, spaced 3/8" for 10 turns
>  > > > >sucker gap
>  > > > >right now 30 nF 35 KV maxwell
>  > > > >14400V  PT running @ 1800 W -125 MA
>
>
> Tesla list wrote:
>
> >Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>
> >
> >Sorry about getting back to you Bart almost 2 months after this kind
reply.
> >It's been hard to find a decent day wheather wise to run my coil. I moded
> >the sec mounting to adj the sec heighth with threaded rod.I'm getting my
> >best results with the bottom of sec 1" above the center of the pri. I'm
> >tapped at 6 turns, with a 0.066uF tank cap. I'm pushing about 4 kVA, and
> >getting HOT consistant 6 foot arcs, some 7, and a few probably close to 8
> >feet. I was able to set the coil up in my buddies pole barn and there had
> >the time to tweek it properly. I find that small stuff, like setting the
> >toroid as close to the sec as possible can have signifigent affects.
Anyway
> >thanks forthe help.
> >----- Original Message -----
> >From: "Tesla list" <tesla@xxxxxxxxxx>
> >To: <tesla@xxxxxxxxxx>
> >Sent: Wednesday, November 16, 2005 12:02 PM
> >Subject: Re: Coupling
> >
> >
> > > Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
> > >
> > > Hi Mike,
> > >
> > > Yes, I really meant that the primary would be 1" above the bottom of
> > > the secondary winding. Racing sparks are caused by poor tuning and by
> > > a coupling coefficient overly tight (energy transfer is too fast
> > > causing a voltage stressed secondary winding). The vertical position
> > > of the secondary affects coupling and also affects the proximity of
> > > primary to secondary voltage standoff (we don't want to arc from
> > > primary to secondary, which is a different mechanism than coupling).
> > > You have a 1.25" gap between the secondary and primary when the sec
> > > bottom turn is even with the pri inner turn. For your coil, that's
> > > about perfect in my mind. As the primary inner turn is moved
> > > vertically up and beyond the bottom sec turn, this 1.25" gap is
> > > maintained. You should not have arc over. However, coupling will
> > > change as a result of adjusting the primary to secondary vertical
> >position.
> > >
> > > The reason your couplin..........