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Idea- Collect Coil Data from List & make a database?


From: 	Adam[SMTP:absmith-at-tiac-dot-net]
Sent: 	Tuesday, November 18, 1997 11:10 PM
To: 	tesla list
Subject: 	Idea- Collect Coil Data from List & make a database?


Here's a question/idea:  Has this list ever been surveyed to collect 
experimental data?  I have been to a few web pages, like that of Charles 
Brush, and the very specific nature of the data and construction details 
contained within these pages has been very helpful to me in building my 
coils.  For example, when I was deciding on what H/D ratio was right for 
my 8" coil, I examined existing coils, quite a few of them!

I could set up a web site, with a form for entering data.  Data collected 
could include just about every aspect of a coil system, from power supply 
to toroid to gap settings and chokes, etc..  Every piece of each coil 
could be a subcategory, with different parameters to enter into the form. 
 For example, the format for a secondary coil of a normal 1/4 wave system 
might have these parameters (example data given is from my latest coil):

SECONDARY COIL FORM:

Coil Form Height (inches):      29"
Coil Form O.D. (inches):        8.250"
Coil Form Shape:                Cylindrical
Coil Form Material:             8" i.d. sonotube cardboard
Coil Form Pre Treatment:        6 thin coats of Behr Clear Gloss 
polyurethane
Coil Form Cost & Supplier:      $4.25 -at- Home Depot, Bear Rd. Waltham, MA
                               +$4.50/pt Behr Clear Gloss PU

SECONDARY COIL:

Wire type:                      #20 Formvar magnet wire (5lb spool)
Length of Windings:             25.125"
Winding geometry:               close wound linear.
Number of Turns:                725t
Calculated self inductance:     31mH
Measures self inductance:       <not yet measured>
Calculated self capacitance:    12pF
Measured self capacitance:      <not yet measured>
Calculated Fc:                  260kHz
Measured Fc:                    <not yet measured>
Coil Protective Coating         6 HEAVY coats of Behr Clear gloss 
polyurethane
Wire Cost and Supplier:         <I can't remember>

I have intentionally omitted figures that can be calculated from this 
basic data by simple geometric relationships-  for example, I used 1570 
feet of wire, which is my coil diameter (given) times Pi times the number 
of turns (given), so I do not need to take this data.  Also, are there 
any parameters I may have left out? Before I make a web page, I will post 
the proposed form of the survey to this list for member approval and so 
that contributions can be made to the list of parameters.

With listmember cooperation, I could build a HUGE data base with hundreds 
of definining parameters for actual working coil systems, along with 
records of their final spark output.  Basically, I would do all the 
preparation work for the survey, and it should only take members a few 
minutes to fill out the form, and the results would be of incredible 
usefulness to all who coil (At least I think so).

Does this seem like too much work for members to enter their data, or is 
it a good idea? Flames and feedback to: absmith-at-tiac-dot-net or this list :-)

-Adam



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Adam Smith
absmith-at-tiac-dot-net
Epoch, Inc. Digital Music Project

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