초록

An aircraft propeller blade is constructed by forming two shells of composite material laminates and bonding the two shells to a metallic spar with foam filler pieces interposed between the shells at desired locations. The blade is then balanced radially and chordwise.

대표청구항 ▼

A method of constructing a blade from a composite material having unidirectional high modulus fibers encased in a ductile low strength, low modulus matrix, the blade including a first and second surface intersecting in a tip end and a root section, a swept back leading edge and a swept back trailing

A method of constructing a blade from a composite material having unidirectional high modulus fibers encased in a ductile low strength, low modulus matrix, the blade including a first and second surface intersecting in a tip end and a root section, a swept back leading edge and a swept back trailing edge, the blade further including a blade spar, said method comprising the steps of: (a) providing a pattern, the pattern representative of an area of constant thickness for the cross section of the blade for each surface; (b) shaping the composite material to the pattern to form a first and a second shell; (c) aligning the blade spar between the first and second shells; (d) positioning foam fillers at predetermined locations for foam filled cavities between the shells; and (e) bonding the blade spar, foam fillers, first shell and second shell together by heating the blade for an appropriate cure cycle for the low modulus matrix.