The ornamental design for a windturbinebladetip, as shown and described.
FIG. 1 is a perspective view of a wind turbine blade tip, shown assembled in an environment of use with an exemplary wind turbine blade;
FIG. 2 is a perspective view thereof, shown disassembled thereof;
FIG. 3 is a perspective view of a wind turbine blade tip, shown with the exemplary wind turbine blade removed to show aspects of the design not visible when combined;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a front elevation view thereof;
FIG. 7 is a rear elevation view thereof;
FIG. 8 is a right side elevation view thereof; and,
FIG. 9 is a left side elevation view thereof.
In FIGS. 1 and 2, the broken lines represent environmental subject matter that forms no part of the claimed design. The remaining broken lines in the figures represent portions of the article which form no part of the claimed design.