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    Al91B

    Al91B

    Technical data                 
    Blade length 91m
    Design type class   IEC S
    Max. chord length   4.8m
    Pre-bending    5.8m
    Pre-cone angle/can be different 0°
    Mass without  T-Bolt 23t
    Mass of  T-bolt     514kg
    Radius center of mass 26.622m
    Design  operation life    20years
    Material   E/H-glass  reinforced Epoxy
    Operation Parameter            
    Rated power 4.x MW
    Rotor Diameter 185m
    Number of blades3
    Power control  Pitchable &  Variable-speed
    Speed range 5-10rpm
    Rated tip speed90.10m/s
    Rated rotor speed  9.25rpm
    Optimal tip speed ratio11.2
    Performance coefficient at TSR-opt 0.48
    Blade Connection            
    Principle Insert
    Bolt hole circle diameter2800mm
    Number, Size of tension bolts112xM36X4.0 10.9
    Outer diameter of root2910mm


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