Calculating Nagaoka's Coefficient for Inductors

[Fischer777]

I've tried searching the web, but so far I haven't run across any formula that states how to obtain Nagaoka's coefficient for an inductor. I have been told, however, that when working with single-layer coils the coefficient can be set to 1, and the calculation will still come out to be accurate within a few degrees of error. Is this true, or does Nagaoka's coefficient need to be computed independently for each inductor (I'm trying to find self-capacitance)?

 

[The Electrician]

I've tried searching the web, but so far I haven't run across any formula that states how to obtain Nagaoka's coefficient for an inductor. I have been told, however, that when working with single-layer coils the coefficient can be set to 1, and the calculation will still come out to be accurate within a few degrees of error. Is this true, or does Nagaoka's coefficient need to be computed independently for each inductor (I'm trying to find self-capacitance)?

Have a look at these sites:

http://electronbunker.ca/CalcMethods.html

http://www.g3ynh.info/zdocs/magnetics/index.html

The last one even has Nagaoka's original paper.