ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,473,062, issued on Nov. 18.
"Reversible camber wingsail" was invented by Daryl Timmerman (Derby, Kan.).
According to the abstract* released by the U.S. Patent & Trademark Office: "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 c...