Hummingbird Project  
   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.
   http://sun-valley.stanford.edu/~heli/

Low Speed Aerodynamics Research Group, University of Glasgow  
   Conducts wind tunnel research on topics including the aerodynamics of helicopter rotor blades. Includes facility descriptions, profiles of current projects, and some online data.
   http://www.aero.gla.ac.uk/Research/LowSpeedAero/Lsamenu.htm

How Helicopters Work  
   Photos and many brief videos in this narrative help to describe helicopter controls, capabilities and complexity.
   http://www.howstuffworks.com/helicopter.htm

Helicopter Aviation  
   This site deals with the aerodynamics of helicopters, instruction on how to fly helicopters, mechanical components, and helicopter maneuvers.
   http://www.copters.com/helicopter.html

Swiss Helicopters by Markus Herzig  
   News and information about helicopters of Switzerland.
   http://mypage.bluewin.ch/aviationworld/heli/

Helicopter Zone  
   Provides links to helicopter sites, animated helicopter GIFs, photographs, and downloads.
   http://www.angelfire.com/ca5/helicopter/index2.html

Boeing Sikorsky RAH-66 Stealth Comanche Helicopter  
   Information on the RAH-66 Stealth Comanche helicopter and the stealth technology used in it.
   http://www.abovetopsecret.com/pages/comanche.html