This is the sum of the form and skin friction drag calculated at zero incidence.
See also: Induced Drag.
This comprises two components: surface friction drag and normal pressure drag (form drag).
Profile drag is the drag incurred from frictional resistance of the blades passing through the air. It does not change significantly with angle of attack of the airfoil section, but increases moderately as airspeed increases.
Induced drag is the drag incurred as a result of production of lift.
Profile Drag Sum of the drag caused by surface friction and pressure
QDM Request magnetic heading to steer towards...with no wind
QDR Request magnetic bearing from ...
An airfoil is the cross section of a wing. The airfoil shape and variations in angle of
attack are primarily responsible for the lift and profile drag of the wing.
Related Definitions from Aviation Glossary ...
See also: What is the meaning of Drag, Aircraft, Wing, Lift, Skin?