Summary of Findings 



A summary of findings based on test observations and data is given 

 below: 



1. For wave lengths long compared to the model length the hydro- 

 dynamic forms extracted sufficient net energy from the waves to cause 

 model drift opposite to the direction of wave travel. 



2. For short wave lengths of the order of magnitude of model length 

 the effect of the hydrodynamic forms was to reduce the drift velocity in 

 the direction of wave travel approximately 107o. This suggests that the 

 net force impulse due to the shape of the hydrodynamic forms is small 

 compared to the net force impulse due to the water surface level varia- 

 tions . 



3. The model drift was affected considerably by the motion of the 

 model with respect to the water surface. 



4. The mechanics of drift of floating platforms suppored by vertical 

 buoyant columns differs considerably from the mechanics of drift of 

 platforms floating on the surface of the water. 



CONCLUSIONS 



Since the rate of energy extraction from waves by hydrodynamic forms 

 was estimated for sea state No. 5 to be only approximately 67o of the 

 energy required to maintain station, the concept does not seem applicable 

 to large floating ocean platforms. 



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