Energy-saving Technology
Technologies enabling fuel saving by improving the propulsive efficiency
Kawasaki RBS-F
Kawasaki RBS-F (Rudder Bulb System with Fins)
"Kawasaki RBS-F" (patented) is an energy saving device installed on a rudder. It consists of a streamline-shaped rudder bulb and airfoil-shaped fins.
The rudder bulb brings smooth inflows to the propeller, and the fins produce thrusts in the rotational flows generated by the propeller. As a result, Kawasaki RBS-F reduces the required propulsive power by 2% to 7%.
"Kawasaki RBS-F" (patented) is an energy saving device installed on a rudder. It consists of a streamline-shaped rudder bulb and airfoil-shaped fins.
The rudder bulb brings smooth inflows to the propeller, and the fins produce thrusts in the rotational flows generated by the propeller. As a result, Kawasaki RBS-F reduces the required propulsive power by 2% to 7%.
Kawasaki RBS-F has been installed on more than 100 ships including LNG Carriers, LPG carriers and bulk carriers.
Kawasaki SDS-F (Semi-Duct System with contra Fins)
"Kawasaki SDS-F" (patented), which is fitted in front of the propeller, is an energy saving device. It consists of contra fins and a semi-duct.
The contra fins produce reverse rotational inflows in the propeller rotating direction and reduce the rotational flows behind the propeller, resulting in the improvement of the propulsive efficiency. The semi-duct produces thrusts in the oblique downward flows of bilge vortices and also prevents the flow separation at the stern position.
Kawasaki SDS-F achieves 3% to 7% energy saving, and by fitting it along with our another energy saving device, Kawasaki RBS-F, further energy saving can be expected.
Kawasaki SDS-F has already been installed on five oil tankers.
The contra fins produce reverse rotational inflows in the propeller rotating direction and reduce the rotational flows behind the propeller, resulting in the improvement of the propulsive efficiency. The semi-duct produces thrusts in the oblique downward flows of bilge vortices and also prevents the flow separation at the stern position.
Kawasaki SDS-F achieves 3% to 7% energy saving, and by fitting it along with our another energy saving device, Kawasaki RBS-F, further energy saving can be expected.
Kawasaki SDS-F has already been installed on five oil tankers.
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