I take a look in my archive and found an old german article about OSOW from Michael Steltzer 1995 in the magazine ‘Fang den Wind Nr.35’. I have a PDF on my own website at http://www.aero-flott.de/wp-content/uploads/2020/12/FdW35-3-1995.pdf . Take a look at page 34ff.
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El vuelo internacional de cometas por la paz