A New Energy Saving System,
Confirming 14% Energy Saving On Actual Ship
By the speed difference of the stream facing to the duct with unique cross-section surrounding the propeller create dynamic lift,
which is utilized as propulsion power.
14% of energy consumption during the sea trial of the real ship and some other superior features were achieved.
3 property was confirmed by comparing with the sister ship
By comparing the data of MV SHIGENOBU equipped with the Gate Rudder System
and its sister ship equipped with a flap ladder, several excellent performances were confirmed.
1. Comparatively high energy saving
14% Energy Saving during the sea trial
Comparing the sister ship during sea trial at the same ship speed, it is achieved that main engine output was 14% lower, which is really significant.
20% yearly Energy Saving on the actual commercial operation of the vessel
Energy saving of the vessel with GATE RUDDER® was achieved steady regardless of the season, and confirmed about 20% less per year than the sister ship with the flap rudder.
2. Excellent course keeping and turning performance
Excellent course keeping
By steering two unsymmetrical rudders at appropriate angle, at a lower ship speed the turning circle could be smaller comparing with the sister ship with the flap rudder and turn linearly even at small rudder angle.
Less than the turning radius required by IMO*
- IMO: International Maritime Organization
(Considering the operation in harbor, during the test at a lower ship speed the turning circle could be smaller comparing with the sister ship with the flap rudder.) And also, at full speed, the turning circle of the vessel fulfilled the requirement of IMO.
3. Enhance silence
Inboard Noise reduction
By the equalization effect on the propeller inflow velocity, the occurrence of cavitation volume is suppressed and the noise in the steering gear room could be reduced 5 dB at the same ship speed comparing with the sister ship.
Underwater Radiated Noise(URN) reduction
Reduced noise levels at high frequencies, which are particularly important for URN. Therefore, the influence to the measurement instrument like sonar and the marine life could be reduced.
Carried out test run of both sister ships with GATE RUDDER®
and flap rudder at the same area and time
On 30th Dec., 2021 off the coast of Kobe, MV SHIGENOBU installed GATE RUDDER® and its sister vessel installed flap rudder had test run to compare the differences. It was confirmed that at the same main engine output, ship’s speed of MV SIGENOBU with GATE RUDDER® was much faster than the sister ship.
