What is a ducktail?
A ducktail is basically a lengthening of the aft ship. The basic idea is to lengthen the effective waterline and make the wetted transom smaller. This has a positive effect to reduce the ship resistance. The adding a ducktail significantly improve flow characteristics . General sources says that ducktail can lower propulsion power requirements by 4-10 percent, and reduces power about 4-7%
Such solution was applied to SIEM CURIE during her 3rd class renewal survey performed in Zhoushan Changhong Shipyard in May 2024.