Blade for flow body i.e. keel, of e.g. rudder, has three protrusions that are provided at outer edge, upper side edge, lower side edge and/or inner edge, where edges are circumferential edges that continuously run over sub-region

摘要

The blade has three protrusions (6) that are provided at an outer edge (4), an upper side edge (7), a lower side edge (8) and/or an inner edge, where the edges are circumferential edges that continuously run over a sub-region. The protrusions are arranged in a region of the outer edge of the blade, where a cross section of the protrusions is flat and/or profiled on a side. The protrusions exhibit same and/or different setting angle (a) with respect to a blade plane.