Profiled blade of a fan and its application in motor-driven ventilating devices

摘要

The blade has an axis ( GAMMA ) which is the locus of the thrust centers (C) of its cross-sections parallel to its foot (13) which has a connecting point (I) between an abyssal arc ( gamma 1) whose concavity faces toward the leading edge (11) and a summit arc ( gamma 2) whose concavity faces toward the trailing edge (12) of the blade.