Air Flow Investigation for Location of Angle of Attack Head on a JN4h Airplane
This NACA technical report from 1925, issued by the National Advisory Committee for Aeronautics, studies airflow around a JN4h trainer to find where an angle of attack vane should sit. Its diagrams map upwash angles in plan view around the airfoil outline, and its photographs show the biplane in flight and a yaw head probe, giving a designer clear, practical examples of measurement graphics and early aviation technical drawing.
