Japan, Sept. 9 -- Mitsui O.S.K. Lines, Ltd. (MOL) announced that it has obtained approval in principle (AiP) from a classification society, Lloyd's Register (LR) for two new different designs of a membrane-type LNG carrier equipped with four units of Wind Challenger, a hard sail wind assisted propulsion system. In addition, safety evaluations were conducted in collaboration with the respective flag states. As a result, this new vessel design, one jointly developed with HD Hyundai Heavy Industries Co., Ltd. (HHI; Headquarters: Ulsan, South Korea) has earned AiP from the Marshall Islands (Marshall), and the other vessel design jointly developed with Samsung Heavy Industries Co., Ltd. (SHI) AiP from Liberia.The AiP covers a new vessel design, ...