Full scale performance of Gate Rudder

Sasaki, Noriyuki and Kuribayashi, Sadatomo and Miles, Adrian (2019) Full scale performance of Gate Rudder. In: RINA 2019, 2019-03-27 - 2019-03-28, 8-9 Northumberland Street.

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This paper introduces a full scale performance obtained from a voyage data of a 2400 dwt container ship equipped with the world first GATE RUDDER®. The GATE RUDDER® is an innovative propulsion system which may not be categorized as a conventional energy saving device and it has not been even fully explored so far. The recent full-scale trials with this domestic container vessel have confirmed the superior performance of the GATE RUDDER® system which is 14% better compared with a conventional rudder system. After 9 months from her delivery, the voyage data revealed the fact that the difference observed in the speed trial was not fortunate and much larger difference 29% was found surprisingly. In this paper, the full scale performance which is largely different from not only the model test but also the sea trial result will be investigated and the paper will conclude that the main reason of this discrepancy between sea trial results and navigation data is due to the difference of rudder resistance which appears during the frequent helm to keep the course controlled by auto-pilot.