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Denizcilik Okulları hakkinda Sailing Yacht Performance : The Effects Of Heel Angle And Leeway Angle On Resistance And Sideforce ile ilgili bilgiler


A racing yacht sails in perfect balance of aerodynamic, hydrodynamic and hydrostatic forces with a leeway angle and a heel angle. The balance of forces and moments must be solved

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Alt 25.11.10, 11:24
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Standart Sailing Yacht Performance : The Effects Of Heel Angle And Leeway Angle On Resistance And Sideforce

A racing yacht sails in perfect balance of aerodynamic, hydrodynamic and hydrostatic forces with a leeway angle and a heel angle. The balance of forces and moments must be solved to obtain sailing leeway and heel angles and predict the speed of the yacht. In this paper, an approach based on towing tank tests and aerodynamic sail data is presented to solve this task.
An elementary background theory of aerodynamic and hydrodynamic forces and moments due to sail and the hull is given to present the balance equations. Aerodynamic forces are introduced by sail lift and drag coefficients. Hydrodynamic forces are derived from towing tank tests for several heel and leeway angles by use of a dedicated experimental system based on a six component balance dynamometer. A PC based data acquisition system is utilised to collect tank data. A typical sailing yacht model at l/8 scale is used for towing tank tests. Towing tank tests are analyzed to investigate the effects of heel angle and leeway angle on the resistance and sideforce generated by the hull. And finally, a VPP analysis is carried out to derive the performance curves.
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INTRODUCTION
There has been recently some interest in sailing yacht racing in Turkey. A study of sailing yacht performance in the design stage has been started Istanbul Technical University, and first stage of this study is presented in this paper.
Performance prediction of sailing yachts is of a complex nature, and differs from conventional ship performance prediction due to presence of leeway angle, hence the sideforce associated with it. The resistance and side force prediction of a yacht is a complicated hydrodynamic problem because of asymmetrical flow about the hull. Experimental methods are being utilised widely for performance predictions.
An experimental approach (Dayi 1991) has been developed to measure the resistance, side force, yawing moment, heeling moment, sinkage and trim angle of a yacht sailing in fixed heel angle and leeway angle at a certain speed in ITU., Ata Nutku Ship Model Testing Laboratory (ANSMTL). The approach has been verified by experiments on a sailing yacht model at l/8 scale with five different keels. The variation of total resistance and sideforce have been investigated by changing the heel angle, leeway angle, speed and keel characteristics. Hydrodynamic efficiency of the hull (sideforce/resistance) is demonstrated.
Based on aerodynamic data and towing tank data, a velocity prediction program has been developed to predict the yacht speed at any arbitrary true wind angle and true wind speed (Helvacioglu and Insel 1994).


Sebnem Helvacioglu
Faculty of Naval Architecture and Ocean Engineering, ITU
Mustafa Insel
Faculty of Naval Architecture and Ocean Engineering, ITU
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Dosya tipi: pdf Effects of Heel Angle and Leeway Angle on Resistance and Sideforce.pdf (230,3 KB (Kilobyte), 4x kez indirilmiştir)
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