On Thursday, September 26, 2019 at 8:40:34 PM UTC-4, Charles Longley wrote:
How many wing failures have composite gliders had over the years?

A fair number, but I can't think of any that were due to normal flight. For example, at least 1 or 2 Slingsby Vegas came apart, but I believe both of those were due to exceeding design limits. Same for a Zuni. A fair number of others came apart due to flutter.

P3