If you are interested in winch operations and ground launching, you are invited to join
https://groups.io/g/winchops
There is a WIKI page with links to the files and photos archives from the former Yahoo groups winchdesign, winchengineer, and pulleylaunch. The posts are a possible work in progress.

There is also a newish Glider winch appreciation group on Facebook at
https://www.facebook.com/groups/522200961801641

Frank Whiteley