On the Slamming Test of a Wooden Model Ship

Abstract

The authors performed towing test of a wooden model ship under regular waves and measured the pressure distributions at foreward bottom of the model when she was slamming, by using 19 specially designed pressure gauges.
The maximum pressure observed reached about 4 to 5 times of static pressure under regular waves and position of maximum pressure located about 0.1L from F. P., and dynamical pressure became practically zero at about 0.25L from F. P..
According to the experimental results, maximum pressure seemed to be related to the relative normal velocity of ship to wave rather than pitching or heaving velocity. And this result is expected from rough theoretical consideration written in Appendix and this maximum pressure can also be estimated from the pressure measured by falling test of flat or wedge shaped body on the surface of water.
Slamming appeared when the ratio of length of wave to that of ship became about 1.1 to 1.2 in this test.