Interesting ...

So the original cloth over avian inspired skeletal designs built by
Otto were sailplanes ... Segelflugzeug ...

Then at some point Gleiter (Glider) was a descriptive term ... that may
or may not have had performance implications.

Then in the 20s the term sailplane was 're-defined' to mean higher
performance ... vs. gliders I assume ...
Thanks all for you info on this ...

KK