Internal version which incldes speed trial result etc..
The power saving 14% was so large that we have decided to monitor after her delivery.
After two years monitoring, the saving od 23% was found.
After three years from her delivery, many advantages of gate rudder were found
０１．Reduction of main propeller thrust by tacking effect utilizing the oblique flow
０２．The better propeller design can increase the propeller efficiency by 3-5%
０３．The longer paint life can be expected due to small drift motion at the stern
０４．The best engine performance can be expected by changing the rudder toe angle
０５．Smaller sea margin ( the gate rudder produces more thrust in the wind and waves)
０６．The speed drop due to steering is smaller than the conventional rudder ship
０７．The acceleration performance from the lower speed is excellent
０８. The minimum ship speed when the bow thruster is effective can be improved
０９．The pivot turn and the crabbing motion can be achieved by the gate rudder
１０．The safety operation can be expected by reducing the drift angle at a large helm
１１．The emergency operation with one blade will support the safety operation
１２．The dragging anchor can be protected by gate rudder
１３．The ship motion can be reduced by the gate rudder which is 4 times larger than BK
１４．Higher turning ship speed at the same turning circle with a conventional rudder
１５．Easy propeller shaft withdrawal
１６．The safer structure because of the smaller vibratory force from the propeller
１７．The vibration in the stern part induced by the propeller and rudder can be reduced
１８．The lower under water propeller emitting noise
１９．Small wash due to lower propeller load
２０．The better stern design can be achieved by removing the original rudder