On Wednesday, June 24, 2020 at 2:04:44 PM UTC+1, wrote:
If the desire is for a 15M, perhaps look for one with a broken tail boom?

Ground vibration flutter mode testing is a standard and non-destructive procedure for the certification of new gliders. I bought Discus 2cT SN 001 new and before I took delivery of it I agreed that Schempp-Hirth could use it for that testing. It survived.