









































































3- 

































\0 , 











^ 























8 



























D 





_5 , 



zS 





































i 









































%. 



















s 



















■f^Z. 





































"o> 























































































































































Figure 4 - Forces in an Anchor Cable for a Scope of 3.0 



Expressed in functional form, Figure 2 gives a graphical presenta- 

 tion of the functions 



L _ F { D 



WY'") 



and 



S ~ F \WY '^) 



when the angle of the anchor line at the anchor, <f> , is zero. Here n is a 

 current parameter, which is defined in Figure 1 and discussed in a following 

 section. When the drag of the ship, D, the weight per unit length of the 

 line in water, W, the depth of water, Y, and the value of fi are given, then, 

 from Figure 2, the values of Y/S and L/WYcan be read, and hence the length 

 of cable, S, and the corresponding downward load L at the ship can be deter- 

 mined such that O = 0. 



When the depth of water is very great, it may be impracticable to 

 pay out the length of line required to obtain a zero angle at the anchor. In 

 any case, however, it is desirable to keep the inclination of the cable and 

 its tension at the anchor as small as possible. Consequently, for preliminary 

 design purposes, it is desirable to have a method for determining the tension 

 and angle at the anchor for various assumed types and lengths of anchor cable. 



