On Saturday, May 23, 2020 at 9:17:05 AM UTC-7, wrote:
In my case, no.
I am not going to name the glider manufacture because I there are very few of these (only the second one I have ever seen), and it is not my place to
“Out” the individual. It is his place, if he desires. That said this was an extremely light glider, less than 400# including pilot. I am in a 260 Pawnee. Very gentle nose down, slow event, obviously it would have been an entirely different story with a water laden heavy two or even single place.
I am thankful for that.

Thanks for posting this report - it proves that even a very light glider can upset a substantial towplane. Do you recall how much altitude you lost during the upset?

Tom