This paper describes aircushion effect for response reductions of floating bodies and thereby the model experiment in a wave tank is carried out and their details are explained. The floating body model has three aircushions and is supported by the aircushions. The response reduction due to the aircushion is considered and confirmed using the model experiment in regular waves and oblique waves. A pontoon type floating body model is also used to the experiment for comparisons of responses with the aircushion type model. From results of the experiment, vertical motion can be reduced due to the aircushion effect in not only head sea waves but also oblique waves. And then, it is confirmed that the second-order tension of tethers which moor the experimental model can be reduced at the same time. The response reduction due to the aircushion effect is useful in oblique waves and even then the wave angle approaches beam sea conditions.

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