Observations in Flight of the Region of Stalled Flow over the Blades of an Autogiro Rotor
This NASA technical report from 1939, issued by the NASA Technical Reports Server collection, presents flight observations of stalled airflow over autogiro rotor blades for aeronautical engineers and researchers. The four pictures are polar diagrams with compass-style angle grids, radial lines and curved traces comparing theoretical and experimental regions of stalled flow, labelled with air direction and direction of rotation, offering a designer little beyond the graphic clarity of technical charting.
