T is the tension in the cable at the point where the cable meets the 

 body, i.e., the magnitude of the force applied by the towed body, 



R is the drag of a unit length of the cable when the cable is normal 

 to the stream, 



r, o , r] , and f , are certain functions of <j> which depend upon the specif- 

 ic assumptions that are made regarding the forces acting on the 

 cable, where 



<j> is the angle between the cable and the direction of the motion at 

 the upper end of the cable, and 



T ~> ff ~> v~> a nd f . are the values of these functions for <t> = s. See 



OO'O'O 



Figure 1 . 



Figure 1 - Cable Configuration For a Towed Body 



Since y, R, and & are fixed, Equation 

 or T as an explicit function of 



A general expression for the optimum configuration can be obtained 

 through the use of these equations. 

 [3] gives <f> as an implicit function of T , 

 <t>. In Equation [1 ] T can therefore be considered to be a function of either 

 T Q ,<6, or any function of <t> . The optimum configuration is obtained by mini- 

 mizing T. This can be done most easily from the differential forms of Equa- 

 tions [1 ] and [3] taken simultaneously, which can be written 



