초록 ▼

A wall having a surface in contact with a fluid, has a surface configuration which reduces drag if there is relative movement between the surface and the fluid. The wall is made of metal or of fiber composite material in such a way that sharp edged or fine ridges and grooves between the ridges are f

A wall having a surface in contact with a fluid, has a surface configuration which reduces drag if there is relative movement between the surface and the fluid. The wall is made of metal or of fiber composite material in such a way that sharp edged or fine ridges and grooves between the ridges are formed as integral surface components of the wall structure for simplifying the construction, reducing the weight, and increasing the useful life of structures having such walls.

대표청구항 ▼

A wall having a drag reducing surface configuration to be contacted by a fluid, comprising a wall structure made of fiber composite material including reinforcing fibers embedded in a resin matrix material, said wall structure having sharp edged ridges separated by valleys, and wherein said resin ma

A wall having a drag reducing surface configuration to be contacted by a fluid, comprising a wall structure made of fiber composite material including reinforcing fibers embedded in a resin matrix material, said wall structure having sharp edged ridges separated by valleys, and wherein said resin matrix material is recessed in said valleys so that said fibers extend into said sharp edged ridges and are at least partially exposed at least along said ridges for an increased resistance against wear and tear.