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.

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.

AAL - Adaptive Helicopter Rotors
Information on Solid State Rotor System (SSRS) and Flight Test Program (R/C).

How Helicopters Work
Photos and many brief videos in this narrative help to describe helicopter controls, capabilities and complexity.

Helicopter Aviation
This site deals with the aerodynamics of helicopters, instruction on how to fly helicopters, mechanical components, and helicopter maneuvers.

Swiss Helicopters by Markus Herzig
News and information about helicopters of Switzerland.

Helicopter Zone
Provides links to helicopter sites, animated helicopter GIFs, photographs, and downloads.

Boeing Sikorsky RAH-66 Stealth Comanche Helicopter
Information on the RAH-66 Stealth Comanche helicopter and the stealth technology used in it.