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CHAPTER 2
HELICOPTER AERODYNAMICS WORKBOOK
ROTOR BLADE AERODYNAMICS
DEFINITIONS
To begin our discussion of rotary wing aerodynamics, we will start with a few basic
definitions using figure 2-1 as a reference. A chord line is the line connecting the leading edge
of the blade to the tip of the trailing edge. The chord is defined as the distance between these
two points. The camber line is the line halfway between the upper and lower surface, camber
being the distance between camber line and chord line (figure 2-2). The tip-path-plane (TPP) is
defined as the plane of rotation of the rotor blade tips as the blades rotate (figure 2-3). The area
of the circle bounded in the TPP is the rotor disk, which is very apparent from an overhead view.
Figure 2-1 Chord
Figure 2-2 Camber
2-2 ROTOR BLADE AERODYNAMICS


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