Marine propeller blade made from reinforced flexible material - has fins normal to surface one side, and wire round edge

摘要

The blade (2) for marine propulsion made from elastic material has a central spar (5) fitted into a central bore. The blade has equally spaced perpendicular fins (8) at right angles to the spar. The fins are one side of the blade only. The opposite side of the blade has a stiffening wire (14) mounted all the way around the blade, with elements (12) crossing the width of the blade.