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US 2006/0140772 A1Published application
Composite blade
AssigneeROLLS-ROYCE plc
InventorsAlison McMillan, Andrew Jackson
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AssigneeROLLS-ROYCE plc
InventorsAlison McMillan, Andrew Jackson
Estimating the term…
A composite blade (26) comprises a root portion (36) and an aerofoil portion (38). The aerofoil portion (38) has a tip (42), a chord (C), a leading edge (44), a trailing edge (46), a suction surface (48) extending from the leading edge (44) to the trailing edge (46) and a pressure surface extending from the leading edge (44) to the trailing edge (46). The composite blade (26) comprises reinforcing fibres (52) in a matrix material (54). The aerofoil portion (38) adjacent the root portion (36) has regions (56, 58) at least at the leading edge (44) and trailing edge (46) comprising an asymmetric lay up of reinforcing fibres (52) and the aerofoil portion (38) adjacent the tip (42) having at least a region (62) at the mid-chord comprising an asymmetric lay up of reinforcing fibres (52).
A composite blade comprising a root portion and an aerofoil portion, the aerofoil portion having a tip, a chord, a leading edge, a trailing edge, a suction surface extending from the leading edge to the trailing edge and a pressure surface extending from the leading edge to the trailing edge, the composite blade comprising reinforcing fibres in a matrix material, the aerofoil portion adjacent the tip having at least a region at the mid chord comprising an asymmetric arrangement of reinforcing fibres.
A rotor assembly comprising a rotor carrying a plurality of circumferentially arranged radially outwardly extending composite blades, each composite blade comprising a root portion and an aerofoil portion, the aerofoil portion having a tip, a chord, a leading edge, a trailing edge, a suction surface extending from the leading edge to the trailing edge and a pressure surface extending from the leading edge to the trailing edge, each composite blade comprising reinforcing fibres in a matrix material, the aerofoil portion adjacent the tip having at least a region at the mid chord comprising an asymmetric arrangement of reinforcing fibres such that in operation the tip of the composite blade is movable between a first position having a C-shaped cross-section at a first rotational speed and a second position having an S-shaped cross-section at a second, higher, rotational speed.
Dependencies are inferred from the claim text.