초록 ▼

A propeller blade made of an advanced composite of uniaxial fibers laminated in crossplies to take advantage of their high axial strength. The thinness and strength of the plies are exploited in assembling the plies at various orientations to produce propeller blades which respond to changing aerody

A propeller blade made of an advanced composite of uniaxial fibers laminated in crossplies to take advantage of their high axial strength. The thinness and strength of the plies are exploited in assembling the plies at various orientations to produce propeller blades which respond to changing aerodynamic loads in the complex ways necessary to maintain an optimum shape.

대표청구항 ▼

An improved propeller blade of the type having a leading edge, a trailing edge, a root, a tip and an axis extending from the root to the tip, the improvement comprising: a laminate of a plurality plies of uniaxial fibers, said plies of uniaxial fibers oriented at varying angles to one another so the

An improved propeller blade of the type having a leading edge, a trailing edge, a root, a tip and an axis extending from the root to the tip, the improvement comprising: a laminate of a plurality plies of uniaxial fibers, said plies of uniaxial fibers oriented at varying angles to one another so the propeller blade pitch varies with the load on the propeller blade and with the axial position along the propeller blade, said plies of uniaxial fibers including a first set and a second set, said first set extending from said root to a position greater than about half way from said root to the tip, said second set extending from the root to the tip, the average axial orientation of said first set being radially outwardly and towards the leading edge of the propeller blade and the average axial orientation of said second set being radially outwardly and toward the trailing edge of the propeller blade so the blade exhibits increasing and then a decreasing pitch from the root to the tip.