Wind turbine mounted crane

A wind turbine mounted crane configured to facilitate an installation, a maintenance and/or a repair of a wind turbine, the crane comprising:

• a. a base portion, comprising a main crane body and a slew platform;
• b. a wind turbine connection mechanism connected to the main crane body of the base portion and configured to releasably engage with a wind turbine and arranged such that the base portion is supported by the wind turbine when the wind turbine connection mechanism of the crane is engaged with the wind turbine;
• c. a boom rotatably connected to the main crane body of the base portion about a vertical axis passing through the base portion,
• d. a lifting hook for lifting a load,
• e. a first lifting elongated flexible member and a second lifting elongated flexible member, the first and second lifting elongated flexible members running through the main crane body of the base portion and along the boom and being connected to the lifting hook, and
• f. at least one winch connected to the first and second lifting elongated flexible members, the winch and lifting elongated flexible members being arranged such that when the at least one winch is rotated, the lifting hook moves up or down,
• wherein
• g. the boom is configured to rotate about the vertical axis relative to the main crane body of the base portion by more than 180 degrees from an initial position in a first direction and more than 180 degrees from the initial position in a second direction opposite to the first direction.