Rotor turning lifting yoke

Rotor lifting yoke for lifting a rotor of a wind turbine with three blades, said lifting yoke comprising:

• a. a lifting structure which is suitable for being lifted by a crane,
• b. a first and second flexible elongated element arranged to be connected both to the lifting structure and to a root portion of a first blade of the rotor, and
• c. a third and fourth flexible elongated element arranged to be connected both to the lifting structure and to a root portion of a second blade of the rotor,
• d. said first and second flexible elongated elements being arranged such that when they are connected to the root portion of the first blade, the first flexible elongated element is in contact with a rotor tip facing side of the root portion of the first blade and the second flexible elongated element is in contact with a rotor base facing side of the root portion of the blade, and
• e. said third and fourth flexible elongated elements being arranged such that when they are connected to the second blade, the third flexible elongated element is in contact with a rotor tip facing side of the root portion of the second blade and the fourth flexible elongated element is in contact with a rotor base facing side of the root portion of the second blade,
• f. characterized in that the rotor lifting yoke further comprises one or more length adjusting mechanisms which are arranged to adjust the effective length of the first and third and/or the second and fourth flexible elongated elements, and
• g. in that the rotor lifting yoke and said flexible elongated members are further arranged such that when said flexible elongated members are attached to the root portions of their respective blades, at least one point on the first and third and/or at least one point on the second and fourth flexible elongated elements is attached to their respective blades via a non-slip attachment.