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