Over The Counter Viagra Substitute : Guaranteed Quality!

Induced Drag
Aerodynamics
Introduction
—  Read:
ANA 61-68
Overview
—  Differences Between Airfoils and Wings
—  Wing Terminology Review
—  Wing Vortices (Development of Lift by a Wing) and
induced drag
—  Effect of wing planform on induced drag.
Differences Between
Airfoils and Wings
—  Airfoils
—  Infinite wings – no wing tips – no wing tip vortices.
—  2D flow
—  Air flows in a straight line from leading edge to
trailing edge.
—  No spanwise flow.
—  No consideration of overall wing shape.
—  Wings
—  Finite wings with wing tips and wing tip vortices.
—  3D flow
—  Includes spanwise flow components.
Wing Vortices (Development of Lift
by a Wing) and Induced Drag
—  Wingtip vortices - ANA
Figure 1.29 s1.
Rectangular wing
producing lift.
Induced Downwash
—  Vortices produce induced
downwash
—  Addition to downwash
necessary to produce lift
—  Produces a net downward
component to relative wind
—  Tilts Lift Vector
—  The lift vector reward tilting
produces a component of
lift PARALLEL to relative
wind –this is induced drag
Induced Downwash =
Induced Drag
Wing Planforms wrt
Vortices
—  Qualitative approach only,
no calculations.
—  Wing planform affects wing
tip vortex intensity,
spanwise lift distribution,
and induced drag.
—  *An elliptical wing provides
the least induced drag for
a given aspect ratio.
—  Each sq foot of area along
span produces exactly the
same lift pressure.