Flutterby™! :

You've gotta take seriously those aeronautical engineers who publish their work on GeoCities: Via AVWeb, the Rotopter (in his defense, it's more a teaching project and intellectual exercise): "the initial idea of the Rotopter was simple: to replace the progressive motion of a flapping wing with rotation of the one around vertical axis. Designing a link mechanism that drive the wing (blade) in flapping movement and enable free rotation around vertical axis was not difficult. Much more challenging turn out to be creating a device that will allow variation of the wing incidence angle."