Disclosed is a sailboat with a reversible camber wingsail and an air rudder assembly. The wingsail is capable of forming first and second high lift airfoil shapes of opposite cambers, and a third neutral, uncambered airfoil shape that allows zero lift (weathervane) docking and storage. The wingsail tacks by reversing the camber of the wingsail and alternating between the two high lift, low drag airfoil shapes. The wingsail employs an adjustable internal framework of spars and rotatable ribs to selectively configure a sailcloth to define the first and second high lift, low drag airfoil shapes and a third neutral airfoil shape. The wingsail incorporates camber linkages and tensioning mechanisms to address complexities of reversing the camber of the airfoil formed by the sailcloth stretched around the framework. The wingsail is detachable from the boat.