CONCLUSIONS OF HYDRAULIC MODEL STUDIES 



1, The crescent-shaped columns can provide a limited force in the 

 direction of wave propagation when they are oriented with the convex side 

 facing the approaching waves. They are most effective in high waves of 

 low frequencies. 



2, The crescent-shaped columns can be also used to create maximum 

 wave drag for propulsion purpose when they are positioned with waves coming 

 toward the concave sides. 



3. The hypothesis that differential wave forces may be produced by 

 unsymmetrical cylinders having two different drag coefficients is valid 

 in cases where the inertia force is insignificant. 



4. No significant amount of net lift force can be produced by orienting 

 the long axis of the cross-section of the non-symmetric models in parallel 

 with the direction of wave propagation. 



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