| 摘要 |
An airfoiled blade for improving the performance of a propeller at low aircraft speeds and for maintaining good performance of the propeller at high aircraft speeds is disclosed. The blade comprises a root portion for connection to a hub of the propeller and a tip portion defining an opposite end of the root portion. An elongated portion extends between the base portion and the tip portion and defines a leading edge and a trailing edge. The elongated portion has a cross-section defined by a scaleable airfoil section. The scaleable airfoil section comprises a chord having a fifty-percent chord station, a forward end defining the leading edge of the blade and an aft end defining the trailing edge. The airfoil section is aft end loaded for developing aft end lift. The scaleable airfoil section also has a camber distribution and a thickness distribution based therefrom. The thickness distribution defines an upper surface and a pressure surface, wherein the thickness distribution has a maximum location substantially forwardly positioned relative the fifty-percent chord station and toward the leading edge. The upper surface is designed to delay mach number build-up thereon and flow separation on the airfoil and the pressure surface is designed to prevent premature flow separation at cruise lift coefficients. |
