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A mounting ring arrangement adapted for alignment of root bushings in a rotor blade root end during a rotor blade assembly step includes a mounting ring segment; and a partial mounting ring, which partial mounting ring is a closed annular component and includes a recess dimensioned to accommodate th

A mounting ring arrangement adapted for alignment of root bushings in a rotor blade root end during a rotor blade assembly step includes a mounting ring segment; and a partial mounting ring, which partial mounting ring is a closed annular component and includes a recess dimensioned to accommodate the mounting ring segment. A method of manufacturing a rotor blade, includes (A) arranging a fiber layup in a first blade mold and arranging a fiber layup in a second blade mold; (B) arranging the partial mounting ring of a mounting ring arrangement in the first blade mold and arranging the mounting ring segment of the mounting ring arrangement in the second blade mold; and (C) joining the first and second blade molds such that the partial mounting ring and the mounting ring segment join to form a full mounting ring.

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1. A mounting ring arrangement adapted for alignment of root bushings in a wind turbine rotor blade root end during a rotor blade assembly step, the mounting ring arrangement comprising: a mounting ring segment in a shape of an arc segment of an annulus and configured to support a plurality of ring

1. A mounting ring arrangement adapted for alignment of root bushings in a wind turbine rotor blade root end during a rotor blade assembly step, the mounting ring arrangement comprising: a mounting ring segment in a shape of an arc segment of an annulus and configured to support a plurality of ring segment root bushings that form a first portion of an annular array of root bushings; anda partial mounting ring, comprising a closed annular body and a recess in the shape of the arc segment and dimensioned to accommodate the mounting ring segment therein, wherein the partial mounting ring is configured to support a plurality of mounting ring root bushings that form a second portion of the annular array of root bushings between an inner diameter and an outer diameter of the closed annular body,wherein when the mounting ring segment is positioned in the recess, the first portion and the second portion form the annular array of root bushings. 2. The mounting ring arrangement according to claim 1, wherein the mounting ring segment extends over an angular range of at least 90°. 3. The mounting ring arrangement according to claim 1, further comprising a connection for connecting the mounting ring segment to the partial mounting ring to complete a full mounting ring. 4. The mounting ring arrangement according to claim 3, wherein the connection comprises a first guide formed in the partial mounting ring and a corresponding second guide formed in the mounting ring segment, wherein the corresponding second guide is arranged to align with the first guide. 5. The mounting ring arrangement according to claim 3, wherein the connection comprises a guide bolt for aligning the mounting ring segment to the partial mounting ring. 6. The mounting ring arrangement according to claim 3, wherein the connection comprises a tightening bolt for securing the mounting ring segment to the partial mounting ring. 7. The mounting ring arrangement according to claim 1, wherein with respect to an axial extent of the mounting ring arrangement a thickness of the mounting ring segment comprises at least 10%, of a thickness of the mounting ring arrangement when assembled. 8. The mounting ring arrangement according to claim 1, further comprising a number of through-holes realized for connection of a number of root bushings to the mounting ring segment and/or to the partial mounting ring. 9. The mounting ring arrangement according to claim 1, further comprising a fastener adapted to connect the partial mounting ring to a blade mould. 10. A rotor blade mould comprising a corresponding opening for securing the rotor blade mould to a component of a mounting ring arrangement according to claim 1. 11. A method of manufacturing a wind turbine rotor blade, comprising (A) arranging a fibre layup in a first blade mould and arranging a fibre layup in a second blade mould;(B) arranging the partial mounting ring of a mounting ring arrangement according to claim 1 in the first blade mould and arranging the mounting ring segment of the mounting ring arrangement in the second blade mould;(C) joining the first and second blade moulds such that the partial mounting ring and the mounting ring segment join to form a full mounting ring arrangement. 12. The method according to claim 11, further comprising inserting fasteners through a number of guides of the mounting ring arrangement andtightening the fasteners to secure the mounting ring segment to the partial mounting ring. 13. The method according to claim 11, wherein the step of joining the first and second blade moulds is performed by an overhanging crane. 14. The method according to claim 11, wherein the mounting ring segment is arranged in the first blade mould at a distance offset from its final position in a complete mounting ring. 15. A rotor blade manufactured using the method according to claim 11. 16. The mounting ring arrangement according to claim 1, wherein the mounting ring segment extends over an angular range of at least 120°. 17. The mounting ring arrangement according to claim 1, wherein with respect to an axial extent of the mounting ring arrangement a thickness of the mounting ring segment comprises at least 20% of a thickness of the mounting ring arrangement when assembled. 18. The mounting ring arrangement according to claim 1, wherein the plural mounting ring root bushings are aligned with an axial extent of the closed annular body. 19. The mounting ring arrangement according to claim 1, the partial mounting ring further comprising an annular first end and a second end opposite the annular first end, wherein the annular first end of the partial mounting ring defines an annular first end of the mounting ring arrangement,wherein when the mounting ring segment and the partial mounting ring are assembled together, the second end of the partial mounting ring and the mounting ring segment define a second annular end of the mounting ring arrangement. 20. The mounting ring arrangement according to claim 1, the mounting ring segment further comprising a ring segment end face, and the partial mounting ring further comprising a mounting ring end face, wherein when the mounting ring segment and the partial mounting ring are assembled together the ring segment end face and the mounting ring end face are flush with each other and define an annular end face of the mounting ring arrangement.