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The invention relates to a rotor blade for a wind turbine. The rotor blade comprises a shell and a spar forming a longitudinally extending hollow structure within the shell and comprising: a leading web, a trailing web, and one or more additional webs. Each additional web defines an intermediate por

The invention relates to a rotor blade for a wind turbine. The rotor blade comprises a shell and a spar forming a longitudinally extending hollow structure within the shell and comprising: a leading web, a trailing web, and one or more additional webs. Each additional web defines an intermediate portion between a hub end and a tip end. The intermediate portion of each additional web is spaced apart from the leading and trailing webs and at least one of the tip and the hub ends is connected to or integral with the leading or the trailing web. The invention further relates to a wind turbine comprising the rotor blade, and a method for manufacturing the rotor blade.

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1. A rotor blade for a wind turbine, the rotor blade comprising a shell and a spar, the shell forming a windward and a leeward side and the spar forming a longitudinally extending structure within the shell, the spar comprising: two caps;a leading web;a trailing web; andone or more additional webs;w

1. A rotor blade for a wind turbine, the rotor blade comprising a shell and a spar, the shell forming a windward and a leeward side and the spar forming a longitudinally extending structure within the shell, the spar comprising: two caps;a leading web;a trailing web; andone or more additional webs;wherein each web extends between the windward and leeward sides of the shell;wherein the leading web and trailing webs are interconnected by the caps to form a hollow structure;wherein each additional web has a hub end and a tip end and defines an intermediate portion between the hub end and the tip end where at least one of the tip and the hub ends is directly connected to the caps or the leading or the trailing web; and wherein in a direction transverse to the longitudinal direction of the spar when at a cross section of the spar along the intermediate portion, the intermediate portion of each additional web is spaced apart from the leading and trailing webs. 2. The rotor blade according to claim 1, wherein the shell forms a leading edge and a trailing edge and wherein the rotor blade defines a trailing additional web arranged between the trailing edge and the trailing web. 3. The rotor blade according to claim 2, wherein the trailing additional web forms at least a part of the shell in the area of the trailing edge. 4. The rotor blade according to claim 1, wherein the shell forms a leading edge and a trailing edge and wherein the rotor blade defines a leading additional web arranged between the leading edge and the leading web. 5. The rotor blade according to claim 4, wherein the leading additional web forms at least a part of the shell in the area of the leading edge. 6. The rotor blade according to claim 1, further comprising one or more interconnecting elements arranged to abut one of the additional webs and one of the leading and trailing webs so as to space apart the intermediate portion of said additional web from the leading and trailing webs. 7. The rotor blade according to claim 1, wherein one of the caps is a leeward cap, the other of the caps is a windward cap, the leeward and windward caps have longitudinal edges, and the leeward and windward caps are interconnected at their longitudinal edges by means of the leading and the trailing webs so as to define the longitudinally extending hollow structure. 8. The rotor blade according to claim 7, wherein at least one of the leeward cap and the windward cap defines a part of an aerodynamic profile of the rotor blade. 9. The rotor blade according to claim 1, wherein the longitudinally extending hollow structure defines a mounting structure with an adhering surface to which one or more additional webs is adhered so as to allow tensile forces to be transferred from the one or more additional webs to the mounting structure. 10. The rotor blade according to claim 9, wherein the mounting structure and the one or more additional webs are shaped such that the tensile forces are gradually transferred from the one or more additional webs to the mounting structure when seen from each of the intermediate portions of the one or more additional webs and towards the hub ends thereof. 11. The rotor blade according to claim 9, wherein the mounting structure defines a tapered protrusion extending from an outer surface of the spar, and wherein each of the one or more additional webs has a tapered end, which is adhered to the tapered protrusion such that a joint cross-sectional area of each of the one or more additional webs and the mounting structure is constant or changes gradually in the area of overlap when seen from the intermediate portion of the additional web and towards its hub end thereof. 12. The rotor blade according to claim 9, wherein the mounting structure defines a tapered protrusion extending from an outer surface of the spar, and wherein each of the one or more additional webs has a tapered end. 13. A wind turbine comprising a plurality of rotor blades according to claim 1. 14. A rotor blade for a wind turbine, the rotor blade comprising a shell and a spar, the shell forming a windward side, a leeward side, a leading edge, and a trailing edge and the spar forming a longitudinally extending structure within the shell, the spar comprising: a leading web, a trailing web, a first cap, and a second cap, the leading and trailing webs being interconnected by the first and the second caps to form a hollow structure; andat least one additional web,wherein each of the at least one additional web has a hub end and a tip end and defines an intermediate portion between the hub and tip ends, where at least one of the hub and tip ends is directly connected to the caps or the leading or the trailing web, andwherein the intermediate portion of each of the at least one additional web is spaced apart from the leading and trailing webs and the leading and trailing edges.