Reduction of fluid resistance on wall surface - involves several large and small concave sections forming several normal and reversed pyramidal structures.

摘要

Several large and small concave sections (3,5) are formed on the wall surface (1) and build several normal and reversed pyramidal structures (Pa,Pb). The reversed structures (Pb) are composed of a single large concave section (3) and several small concave sections (5), which surround the individual large section (3). The several normal pyramidal structures (Pa) are composed of a single small concave section (5) and several large concave sections (5) which surround the individual small concave section (5). Alternatively, the large and small sections can be convex or a combination of concave and convex sections can be used. USE/ADVANTAGE - To reduce resistance to air, water, etc. on the outer surfaces of land vehicles, aircraft, vessels, and the inner walls of pipes.