A Rotor Assembly And A Windmill Comprising The Rotor Assembly

A rotor assembly (101, 201, 301, 401) comprising:

• a rotor mast (109, 209, 309, 409) for rotatable attachment of said rotor assembly (101, 201, 301, 401) to a support structure for rotation of said rotor assembly (101, 201, 301, 401) relative to said support structure about a rotation axis (R),
• a rotor having two rotor blades (103, 105, 203, 205, 303, 305, 403, 405) extending in a virtual plane (V) in a longitudinal direction (L), wherein said two rotor blades (103, 105, 203, 205, 303, 305, 403, 405) are arranged to be propelled by air flow, and
• a pivot arrangement defining a pivot axis (P), wherein said rotor is pivotably connected, by said pivot arrangement, to said rotor mast (109, 209, 309, 409) for pivoting said two rotor blades (103, 105, 203, 205, 303, 305, 403, 405) simultaneously relative to said rotor mast (109, 209, 309, 409) about said pivot axis (P),
• characterized in that, said longitudinal direction (L) and a projection of said pivot axis (P) in said virtual plane (V) enclose a constant acute angle (A) in said virtual plane (V).