Recently many ship owners and ship builders are interested in energy saving device. And many shipyards have also been investing much time to develop energy saving devices. For the energy saving of the subject vessel, Twisted Full Spade Rudder(TFSR) was proposed to install to the subject vessel.
Generally, FSR is well known that it is safer than conventional rudder against cavitation erosion because it does not have cut-out on rudder surface. It is also expected that it has energy saving effect about 1~2% compared with conventional rudder.
In this study, strength assessment of TFSR were performed to verify its structural strength and it was verified using rudder design force defined in CFD and BV(Bureau Veritas) Rule. Through this study, it was found that the FSR with has sufficient structural strength.