The length of the open boat shall not be less than 5 m. The total weight of the open boat after full load shall not exceed 20 t. The side arc of the open boat shall not be less than 4% of the length of the boat, and the shape of the sheer should be approximately parabolic. . In addition to the wooden lifeboat, the square factor of the cubic volume of the open boat should not be less than. If the freeboard and initial stability of the fully loaded lifeboat meet the requirements of 4.3, the square factor may be less than . When the open boat occupant has a fixed quota of 60 or more (including 60 persons), it shall be a motor lifeboat. The occupantâ??s quota for open boats should not exceed 150. The hull material and buoyancy material shall be approved by the Administration or comply with relevant standards. The outer surface of the boat should be clearly visible in orange. Structure and strength The structure of the open boat should be reasonable and have sufficient strength and rigidity.