Getting back to the issue of multiple versions. This info came from a book, Shell Structures: Theory and Applications By Wojciech Pietraszkiewicz, Czeslaw Szymczak.
It represents a collection of papers on common subject.
Fortunately for us all, a portion of the work can be sampled, and [what are the odds]......that portion goes into great detail on Kroplin's Airworm.
There is so much here (pg. 52-55) that will resist the urge to summarize. Simply, every investor should review this material and come to a very simply conclusion [if they have not already, of course]: That there is a tremendous amount of fruitful effort going on behind the scenes which, at some point, is to be revealed.
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