Dual tiltwing aircraft having a quadrilateral linkage

An aircraft having a vertical takeoff and landing flight mode and a forward flight mode, the aircraft comprising:

• a fuselage;
• a dual tiltwing assembly having a vertical lift orientation and a forward thrust orientation relative to the fuselage, the dual tiltwing assembly including a forward wing, an aft wing and a planar quadrilateral linkage having four revolute joints, the quadrilateral linkage rotatably coupling the forward wing to the aft wing, the aft wing to the fuselage and the fuselage to the forward wing at the revolute joints;
• a distributed propulsion system coupled to the dual tiltwing assembly, the distributed propulsion system including a plurality of forward propulsion assemblies coupled to the forward wing and a plurality of aft propulsion assemblies coupled to the aft wing;
• and
• a flight control system operably associated with the distributed propulsion system and the dual tiltwing assembly, the flight control system operable to transition the dual tiltwing assembly between the vertical lift orientation and the forward thrust orientation;
• wherein, the quadrilateral linkage includes a first link formed by the fuselage, a second link coupled between the first link and the forward wing, a third link coupled between the forward wing and the aft wing and a fourth link coupled between the aft wing and the first link.