Re: Rotor BPS

To: tesla-at-poodle.pupman-dot-com
Subject: Re: Rotor BPS
From: Tesla List <tesla-at-stic-dot-net>
Date: Fri, 30 May 1997 09:19:42 -0500
Approved: tesla-at-stic-dot-net
Subject:     Re: Rotor BPS
      Date:  Thu, 29 May 1997 18:39:58 -0500
      From:  Chuck Curran <ccurran-at-execpc-dot-com>
        To:  Tesla List <tesla-at-pupman-dot-com>
References:  1


Tesla List wrote:
> 
> Subject:  Re: Rotor BPS
>   Date:   Mon, 26 May 1997 18:45:14 -0600
>   From:   "DR.RESONANCE" <DR.RESONANCE-at-next-wave-dot-net>
>     To:   "Tesla List" <tesla-at-pupman-dot-com>
> 
> To: Gary Weaver
> 
> RSG with 10 -12 electrodes running non-synchro at 1800 RPM on a 12" dia.
> wheel seem to work fine from 6-15 KVA.  The air generated by the 1/2
> dia.
> electrodes whirling around seems to do a fine job of quenching.  With
> larger coils it is very important to elevate the sec. for best coupling.
> We run some of our systems with up to 4-8 inches of elevation above a
> flat
> copper tubing spiral.  Not much performance gain noted at 3600 RPM.
> 
> Hope this helps out.
> 
> DR.RESONANCE-at-next-wave-dot-net
> 

Hello DR. RESONANCE, Richard Hull & All:

        I have a question that I hope can be directed at both of you and
the
group based on comments by you,  read over the last month or so.  First,
a short update on my situation--I've basically made little progress on
my new coil due to the record cold and rain in south eastern
Wisconsin--worst since 1888!
        O.K., the point made in the post above, about the secondary
being 4-8
inches above the primary and I believe Richard also mentioned something
about 3-4 weeks ago that led me to understand most of the time you
avoided raising the primary above the very bottom of the
secondary---that is where I am real curious.  On my 8" dia. secondary
from last year I first tuned it with the flat primary and secondary
bottom turn on the same plane, running around 6 KW input.  I started to
raise the primary in 1/2" increments believing the coupling and K would
increase resulting in a better spark.  This took place over a 2 week
period with the primary ending up about 3 1/2" or so above the bottom
turn of the secondary.  I attempted to run the autotransformer to the
same point for a comparison between each test point.  I believed at that
time that the most intense and longest spark (80"+) was occurring at
that 3 1/2" point.  
        Now I'm sitting here with my 15 1/4" diameter by 58" long
secondary
that has been collecting mostly dust for 5 weeks.  I must set up outside
to run this puppy and I've been a bit shy doing this in the rain at 42
degrees (F).  I finally corrected an electrical power unit difficulty (
I'll skip that story for now) and last week got a few dry moments to run
it's third test, which resulted in classical primary/secondary
overcoupled type of arcs.  I had raised the primary to about 6 or 7
inches above the bottom secondary turn to achieve a measured K of .25
right from the start with the result being wonderful arcs from primary
to secondary with no toroid breakout so I quickly shut it down.  The
very first test gave 6-8 foot arcs and blew a fuse with no arcs.
        Finally the question-- my present understanding is that you must
be,
based on the posts be elevating the secondary to a point where your K
must drop down to a low level, guessing maybe .08, or .12???  Have I
missed the boat here?  I had expected with what I had learned in working
with my 8" coil tuning process that raising the primary would provide
better output, assuming the system design allowed for the greater K. 
Now the discussion is suggesting another point that I don't have a clear
view/understanding of right now.  Boy, I only have 3" of clearance right
now when I roll it out of the garage and that's without the toroid! 
What I am wondering is that with the bigger coils, is there less
attention to the K value and more to eliminating pri/sec arcs by
increasing clearances?  I have a 2 1/2" air gap between the pri/sec
windings and thought this would be O.K.
        They are actually predicting that the rain will stop (I really
don't
believe it) and it will reach 75 Degrees F this weekend.  I have dropped
the primary to be on the same plane as the lowest/first turn of the
secondary and plan to smoke test this weekend.  If the mood strikes you,
any comments would be of interest.  Thanks in advance!

Chuck Curran
Cedarburg, WI