The aerodynamic effects of wing corrugation on insect flight have received widespread attention. However. there has hardly been any specific focus on dynamic changes to corrugation angle in the models. The flexible vein joints containing resilin in the wings of dragonflies and damselflies enable the longitudinal veins to rotate and thereby change the corrugation angles throughout flap... https://www.spidertattooz.com/Coast-Guard-E7-Rating-Badge-Yeoman-YN-blue/