The ornamental design for a boatpropellershield, as shown and described.
FIG. 1 is a rear, top and left side perspective view of a boat propeller
shield showing our new design;
FIG. 2 is a fragmentary enlarged rear and bottom perspective view thereof,
the cowling is omitted for convenience of illustration; and
FIG. 3 is a fragmentary top, front and right side perspective view thereof,
the lower portion of cowling is shown broken away for convenience of
illustration.