AERODYNAMIC BLADE WITH HIGH STIFFNESS-TO-WEIGHT RATIO

摘要

A flight blade or wing having a structural spar at its forward end comprising a solid forward-portion and an after-portion of low density construction, such as a sandwich construction of honeycomb, plastic foam, or balsa wood core and having a structural trailing edge pocket member to produce a blade of maximum stiffness and minimum weight by eliminating leading edge counterweights and reducing spar weight by substituting sandwich construction material for solid metal wall members in the spar after portion.