BOTW Directory - Science > Technology > Aerospace > Aeronautics > Helicopters

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Helis.com - Narrative of the beginning of the air vehicle's creation as well as developments through time and technology.
Rotorcraft and Helicopter Directory - Compilation of relevant data sources on various types of air vehicles including autogyros, tilt-wings and other references.
Sikorsky Historical Archives - Reference for the different types of pioneering aviation vehicles. Provides an archive of pictures and related data.
Virtual Aviation Museum - Helicopters 1939 to 1945 - Showcases various types of air vehicles produced during the inclusive time. Includes description and illustrations.