This flutter demonstrator wing is printed in a 3D printer, together with its wind-tunnel attachment. The beam structure, made of Fine Polyamide PA-2200, is wrapped in adhesive paper. The weight at the wing tip trailing edge is designed to bring the flutter speed to ~40 m/s. Once at flutter, due to the excessive vibrations, the mass is ejected, flutter stops, and the wing is saved. Phew!
Here’s a video of the Flutter demonstrator in the wind tunnel. And also in slow motion.