The difficulty in creating an ornithopter is the issue of having smooth and consistant wing movement. Many people have tried building these and never quite get the movement right with the wings flapping unevenly.
This little project started about 18 months ago whilst pondering how to do it... this little instructable hopefully explains how I got around the problem.
Step 1: Items used
2. 4mm MDF
3. Motor from redundant 1990's video camera
4. Various cogs and clips from video camera
5. 2mm thick dowels from PC cleaning equipment
Step 2: The upper mechanism
Due to this issue I saw fit to cut a slit in the wing blade (circled in blue on the left) with a length of 6mm, the difference between the maximum coupling distance and the the shortset coupling distance. The couplings were made by drilling a 2mm dowel into MDF and then feeding the blades onto them. The blades were kept in place my minute aluminium washers found in the video camera.