A computer analysis* was performed to determine tension T and angle <p 

 as a function of cable length. The results, which are accurate to ±20% 

 due to problem simplifications made to accommodate the computer, are 

 plotted in Figures D-2 and D-3. Of particular interest is the horizontal 

 component of tension T, since the burier propulsion system must provide 

 this force in addition to the other forces acting on the burier. Table 

 D-1 shows the vertical and horizontal components of T as a function of 

 cable length. A cable length of 6,500 feet and a horizontal component 

 of 3,400 pounds were selected as representative values for concept 

 evaluation. 



Table D-1 . Vertical and Horizontal Components 

 of T as a Function of Cable Length 



Cable Length 



* 



T 



V 



H 



(ft) 



(deg) 



(lb) 



(lb) 



(lb) 



6,100 



75 



11,400 



11,000 



3,000 



6,200 



63.5 



8,500 



7,600 



3,800 



6,300 



57.4 



7,100 



6,000 



3,800 



6,400 



54.2 



6,200 



5,000 



3,600 



6,500 



52 



5,500 



4,300 



3,400 



6,600 



50.2 



5,100 



3,900 



3,300 



6,700 



48.8 



4,800 



3,600 



3,200 



6,800 



47.7 



4,600 



3,400 



3,100 



6,900 



46.8 



4,400 



3,200 



3,000 



7,000 



46 



4,300 



3,100 



3,000 



V = Tsini^ 

 H = Tcosf) 



BURIAL MACHINE DRAG 



Assume that the machine frontal dimensions are width = 12 feet and 

 height = 10 feet. Then, 



w/h = 1.2 



* "DESADE" by R. A. Skop, Naval Research Laboratory. 



71 



