Results in
n
irectio
d Airfoil
Airfoil
Relative wind
Results in
Airfoil direction
e wind
Relativ
Relativ
directi
e wind
Results in
on
Figure 2-13. Relative wind.
Airspeed knots 290
387
183 96
Figure 2-14. Horizontal component of relative wind.
Axis of rotation Figure 2-16. Normal induced flow velocities along the blade span
during hovering flight. Downward velocity is highest at the blade tip where blade speed is highest. As blade speed decreases nearer the center of the disk, downward velocity is less.
Figure 2-15. Induced flow.
2-9