A device aimed primarily at improving propulsive performance. It consists of fixed-type steel fins at the rear of the propeller which are fitted onto the forward side of the rudder horn. As the propeller revolves, it introduces a rotary component into a race, which the Stator Fin turns into an additional propulsion force. Propulsive performance, construction, and strength have been tested during sea trials of ro-ro ship TRANS FUTURE 3 (Significant Ships of 2001).