When the array is in the current; an additional horizontal force, 

 due to the drag on the array, must be included. The magnitude of this force 

 will vary for arrays of different shapes. Assume a Imear array composed of 

 three horizontal hollow cylinders each 600 feet long, Two of the cylinders are 

 assumed to have diameters of two feet, and the third a diameter of one foot. 

 For normal incidence, the drag of the current on the array is equal to 1.8 tons. 

 Since this force is small, compared to the weight of the array, its contribution 

 to the stress will be small. The offset and the horizontal force, F, will in- 

 crease accordingly. 



artbur B.littleJttf, 



S-7001-0307 



