초록 ▼

An airfoil particularly suited for use in rotor blades of large wind-driven power plants is formed in three modular sections including a nose or leading section, a spar section and a trailing section, each separately formed and subsequently assembled. In the method of the invention the spar section

An airfoil particularly suited for use in rotor blades of large wind-driven power plants is formed in three modular sections including a nose or leading section, a spar section and a trailing section, each separately formed and subsequently assembled. In the method of the invention the spar section is formed in two separate mold units which are configured to form part of the upper and lower aerodynamic profile of the airfoil and the two spar section units are trimmed along a junction plane and then joined together at the junction plane to form the spar section of the airfoil.

대표청구항 ▼

A large wind-driven power plant having a rotor blade with an airfoil structure having an upper airfoil surface and a lower airfoil surface comprising: three modular sections consisting essentially of a leading section defining a leading edge of said airfoil, a trailing section defining a trailing ed

A large wind-driven power plant having a rotor blade with an airfoil structure having an upper airfoil surface and a lower airfoil surface comprising: three modular sections consisting essentially of a leading section defining a leading edge of said airfoil, a trailing section defining a trailing edge of said airfoil, and a spar section intermediate said leading and trailing sections; said modular sections being separately formed and subsequently assembled together to form said airfoil structure; said spar section being formed to consist essentially of an upper segment defining a part of said upper airfoil surface and a lower segment defining a part of said lower airfoil surface, said parts of said upper and lower airfoil surfaces extending along the section of said airfoil structure defined by said spar section; each of said upper and lower segments of said spar sections being formed to comprise a plurality of laminate shells with at least one foam bar unit supporting said laminated shells; said upper and lower segments being joined together along planar surfaces thereof which are parallel to an imaginary plane extending between said leading and said trailing edges of said airfoil structure; said laminate shells being formed to include two flange laminates with an interposed thrust transmission laminate therebetween wherein said foam bar unit supports only said flange laminates.