single column models of 4 inch diameter and 8 foot length in a large 

 wave tank. Free drift velocity tests were also conducted with a 14 

 inch by 17 inch rectangular model floating platform with 36 supporting 

 columns to aid in evaluating the concept for MOBS use. 



The results of the tests show that there is a net wave force oppo- 

 site to the direction of wave travel on the column with the crescent 

 cross section. However, an analytical study based on the test data shows 

 the rate of energy extraction from waves by crescent shaped columns for 

 sea state 5 to be about 6% of the energy required for station keeping 

 of a large floating platform. Hence, the concept does not seem applica- 

 ble to large floating ocean platforms. 



