In order to reduce greenhouse gas (GHG) from shipping sector, it is necessary not only to build eco-friendly ships but also make some efforts for reduction of GHG from ships in service. In this regard, especially for fine ships such as a vehicle carrier and a container ship, it is well known that ship propulsive performance can be enhanced by trim optimization, which can contribute to environmental protection and can bring ship operator economic benefit due to fuel saving.

This study addresses trim optimization for propulsive performance by the means of model tests. Model tests are conducted for various trim conditions and the required power is estimated for consideration of trim effect in still water. The effect of draft and trim variation on propulsive performance is investigated and the trim condition in which required power can be saved is clarified.