Cantrell Paul. Helicopter Aerodynamics

No publisher, no date. — 57 p.This document discusses key concepts related to helicopter aerodynamics. It covers topics such as airfoils, rotary wing planforms, relative wind, angle of attack, and more. Airfoils produce lift when air passes over them, and helicopter blades have specially designed airfoil sections. Rotary wing planforms describe the layout of the rotor system, including components like the chord, span, hinge pins, and yoke. Relative wind is the airflow around an airfoil and is affected by both helicopter motion and induced downwash from the rotor. Angle of attack, the angle between the airfoil and relative wind, helps determine lift and is controlled by the pilot but also varies continuously during each blade revolution.Airfoils.
Rotory Wing Planforms.
Relative Wind.
Angle of Attack.
Total Aerodynamic Force.
Pressure Patterns.
Drag.
Centrifugal Force.
Rotational Velocities.
Hovering.
Ground Effect.
Torque.
Translational Lift.
Transverse Flow Effect.
Dissymetry of Lift.
Blade Flapping.
Gyroscopic Precession.
Retreating Blade Stall.
Settling with Power.
Autorotation.
Future Development.