An aerodynamic wingsail and mast assembly, which does not utilize a boom or gaff, and which is simply designed to include a singular sailcloth and resilient bow rod which are removably attached to a free standing mast. The bow rod includes a pair of open-ended brackets to engage the mast, and is positioned in a curved sleeve on the trailing edge of the sailcloth. The sailcloth includes a forward sleeve for receiving the mast. Flanges on the mast engage the brackets, and the sailcloth is simply slid off the mast by releasing the brackets and tension of the bow rod. Alternative embodiments are described for 3 dimensional wingsails.