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|  HELICOPTER AERODYNAMICS WORKBOOK
CHAPTER 2
Figure 2-3
As the rotor blades rotate about the axis, a horizontal flow of air opposite the direction of
blade travel is produced. This is called rotational flow, or linear flow. Rotational flow is parallel
to the TPP, and at constant RPM in a no-wind hover, the speed of rotational flow is directly
proportional to the distance from the hub, increasing with increasing distance from the hub
(figure 2-4).
ROTOR BLADE AERODYNAMICS 2-3
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