. . "the long airfoil that rotates to provide the lift that supports a helicopter in the air"@en-us . . . "103957261"@en-us . . "rotary wing"@en-us . "0"^^ . "103256334"@en-us . "rotor blade"@en-us . . . "104112252"^^ . . "0"^^ . "rotor blade"^^ . . . "04112252-n"^^ . .