sin αst

YAW AND FURLING
For an upwind wind turbine design the basic options for a yaw orientation system are:
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� Yawing by aerodynamic means (tail vane)
� Active yawing with motorised yaw drive
The first option is the obvious choice for small and simple wind turbines and the solution
is therefore adopted for the present wind turbine design. The design is illustrated in
figure 8.2. The wind force on the tail vane ensures that the turbine corrects its direction
as the wind changes intensity and direction.
Figure 8.2: Adopted tail vane design
Figure 8.3 shows the shows a cross-sectional view, revealing the inner components of the
yaw system. The figure is followed by a description of the components.
Figure 8.3: Section view of the yaw system