LIGHTWEIGHT AIRFOIL

摘要

An airfoil (30) having a suction surface (36) and a pressure surface (38), the surfaces joined together at leading (32) and trailing portions (34) of the airfoil, the pressure surface diverging toward the suction surface at a corner, the surface diverging at the corner (40) by an angle approximately equal to or greater than at least 30 DEG , such that an air stream flowing from the leading edge and over the pressure surface separates from the pressure surface at the corner. The fan therefore has thick nose section (41) and is substantially thinner over the majority of its chord length. One or more guide ribs (50) extend from the pressure surface to control the flow of boundary layer air.