A physically-impaired-assisting multi-function sail comprises: a stanchion, a hoisting navigator for allowing an arthritic to deploy and retract the sail without the need to bend the fingers, a hoisting teeter totter secured to the navigator, a teeter-totter hook-lock secured to the teeter totter for automatically locking and unlocking the teeter totter to deploy and retract the sail, a cable secured to a camber, a cable canal formed into the teeter totter for hiding and protecting the cable within, a pivoting pulley housing secured to the teeter totter, a pivoting pulley hub swingingly attached to the pivoting pulley housing, sail-buttresses hingedly attached to the pivoting pulley hub, a sail canopy secured to the sail-buttresses, multiple cable pulleys rotatably secured at multiple locations within the pivoting pulley housing and pivoting pulley hub, a central tube attached to the pivoting pulley hub, sail-buttress-supporting arms hingedly attached to the sail-buttresses, and a shuttling hub attached to the sail-buttress-supporting arms.

A control arrangement (1) for a kite (6) is attached to a boat (2). Without any external control or energy input the control arrangement (1) automatically tracks the movement of the kite (6) as the kite (6) moves relative to the boat (2). The control arrangement (1) ensures that the kite (6) flies so that the line of action (15) of the kite (6) always extends through the centre of lateral resistance (14) of the boat (2). This enables the kite (6) to pull the boat (2) without applying any heeling moment to the boat (2).