Abstract
ABSTRACT The use of free‐fall lifeboats as a lifesaving aid is increasing rapidly in the ocean environment. However, knowledge and information regarding the performance of these lifeboats during water entry and surfacing are yet very much limited. A study has been carried out to investigate the motion and attitude of the lifeboat after water entry and surfacing with respect to various launching parameters. The motion has been categorized on the basis of the advance speed and headway at the first phase of surfacing of the lifeboat. Numerical study has also been carried out to evaluate the effects of launching parameters on the motion characteristics and horizontal velocity at surfacing. Moreover, a suitable falling angle range has been established for the lifeboat model based on zero horizontal velocity at surfacing corresponding to different skid lengths and falling heights. Finally, safe water travel conditions based on launching parameters have been evaluated considering the motion characteristics and the effects of accelerations on the occupants of free‐fall lifeboats.
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