sin αst

� Angle of attack [°]
�st Angle of attack at the onset of stall [°]
� Pitch angle of the blade to rotor plane [°]
�f Furling angle [°]
� Angle of relative wind to rotor axis [°]
�f Partial safety factor for load [-]
�m Partial safety factor for material [-]
� Range [-]
NOMENCLATURE
�h Height difference [mm]
� Efficiency [-]
� Shear stress [MPa]
� Tip-speed ratio [-]
�50 Tip-speed ratio at Ve50 [-]
� Poisson’s ratio [-]
�m Mean value [-]
� Kinematic viscosity of air, assumed 14e-6 [m 2 /s]
� Air density, assumed 1.225 [kg/m 3 ]
� w Wood density [kg/m 3 ]
� water Water density, assumed 1000 [kg/m 3 ]
�’ Solidity ratio [-]
�design Design stress from load case [MPa]
�eq Equivalent stress [MPa]
�lim.f Fatigue limit state stress [MPa]
�lim.u Ultimate limit state stress [MPa]
� Angle of relative wind to rotor plane [°]
�st Standard deviation [-]
� Angular speed of the rotor [rad/s]
�yaw Yaw rate [rad/s]
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