This site deals with the aerodynamics of helicopters, instruction on how to fly helicopters, mechanical components, and helicopter maneuvers. www.copters.com/helicopter.html
Hummingbird is a small research helicopter, at Stanford University's Aerospace Robotics Laboratory, which navigates using an integration of the Global Positioning System with computer vision. sun-valley.stanford.edu/~heli
Conducts wind tunnel research on topics including the aerodynamics of helicopter rotor blades. Includes facility descriptions, profiles of current projects, and some online data. www.aero.gla.ac.uk/Research/LowSpeedAero/Lsamenu.htm