sin αst

8
Yaw and furling
This chapter describes the yaw and furling system, which are integral parts of the pro-
posed wind turbine design. The two systems are closely connected, but described sepa-
rately to the extent that it is possible.
8.1 Yaw orientation system
The fundamental purpose of the yaw orientation system is to keep the rotor facing into
the wind, that is, to align the rotor shaft with the wind direction. If the rotor is to fully
capture the power available in the wind, it must be properly oriented to the wind direc-
tion. Figure 8.1 illustrates an example of the decreased performance for various yaw
angles.
Figure 8.1: Decreased performance for various yaw angles [10, p.91]
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