The ornamental design for a windmillvane for a wind powered generator, as shown and described.
FIG. 1 is a front elevational view of a windmill vane for wind powered generator showing my design;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a perspective view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is an enlarged cross sectional view taken along line 8—8 of FIG. 2; and,
FIG. 9 is a perspective view showing a plurality of windmill vanes of my design assembled for use, the portions shown in broken lines being provided to show position only and forming no part of my design.