Image Number 4 for United States Patent #4738460.
A sail device to be attached to the back of a bicycle rider. The device has a harness to permit attachment to the rider. A frame is attached to the harness and a further frame is pivotally attached to that frame. There is a control to control pivoting of the two frames. A sail is mounted on one frame and is movable between an extended position and a retracted position. The device has controls to extend and retract the sail.