Ancient Web: Paul Cantrell Explained Helicopters Before Video Tutorials
Paul Cantrell's helicopter site preserves 1990s flight photographs, lessons in rotor aerodynamics, and a firsthand account of ferrying a Robinson R22 across the United States.
helicopters
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Ancient Web: Aviastar Kept an Unwieldy World of Rotorcraft in One Index
Aviastar.org preserves a large hand-linked helicopter and autogyro directory that includes historic experimental machines, engineering projects, aircraft photographs, and technical profiles.