BXFlyer Four Rotor Helicopter

A couple of days ago I was talking about small robotic flyers, I should have known that somebody at the Seattle Robotics Society would already have done something like this. Check out BXFlyer Four Rotor Helicopter for a description of a four rotor robotic flyer similar to the commercially available DragonFlyer.

Addendum: I found a link to a nice design document for a similar project. It includes a mathematical model for the dynamics of the system.