Optimal trim setting

OPTIMAL TRIM SETTING

 Optimal trim setting is an operation method that optimizes propulsion performance by adjusting the trim according to the loading condition, and as a result, achieves energy savings. In normal operation, the ship is operated in an even keel or trim by the stern state to maintain the submersion depth of the propeller, but in the case of a fine ship such as a car carrier, the propulsion performance may be improved by trim by the head.

  The Performance of Ships in Actual Seas Research Group is investigating the relationship between trim and propulsion performance through tank tests and numerical calculations. In addition, we are conducting research on the effect of trim on propulsion performance not only in flat water but also in waves.

Examination by water tank test (car carrier)

Level water (no waves or wind)

Equivalent to Beaufort Wind Class 6: Wave Heading Wind
(Significant wave height 3 m, mean wave period 6.7 s, mean wind speed 12.6 m/s)

Contour plot of main engine power required to make 14 knots
(vertical axis: center draft, horizontal axis: stern trim)


Reference
  1. Sogihara, N., Tsujimoto, M., Fukasawa, R.: Investigation on the Effect of Draft and Trim on Propulsive Performance of a Pure Car Carrier, Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers (16), pp.207-210, 2013 (in Japanese).