Trim mechanisms including interceptor, stem flap and the integrated interceptor and stem flap affect the resistance performance of planing craft. To examine the effects of these trim mechanisms on ship resistance, two planing boat were used in this study. One with a ship length 20 meters was tested at the towing tank of National Taiwan University, Taiwan. The other one with a length 29.5 meters was tested at HSVA towing tank, The Hamburg Ship Model Basin, Germany. The tested results show that a well-designed trim mechanism can reduce the running trim and decrease the resistance of the planing craft. The interceptor has better resistance performance in the range of the volume Froude number from 2.0 to 3.0. Stern flap has superior resistance performance as the volume Froude number is greater than 3.0. For the NTU tested model, the optimum trim mechanism is stem flap at design speed. And the optimum trim mechanism of the HSVA tested model is the integrated interceptor and stem flap configuration. Comparing the tested results, 2% to 6% resistance improvement is obtained for the planing craft with trim mechanism.
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