1948 March American Helicopter - Vintage Magazine
Magazine of Rotary Wings - Aviation - Airways
Cover: Pilotless Flight - test pilots of United Helicopters, Inc., watch as an experimental helicopter flies completely unaided - this feat is made possible by a servo control rotor which makes the craft inherently stable
Features: The Helicopter and Stability; Night Mission; Helicopter in Bush Country; Operation Bailout; The New SG Mark VI-D; Notes on Kaman Test Methods; Forestry From the Sky; The JOV-3 Tandem
Back cover has ad for the U.S. Army, showing The Army R-6 Helicopter in flight.
and much more