and a minimum breaking strength of 42.3 kN. Construction of the towcable is illu- 

 strated by schematic cross section in Figure 5. Construction is as follows: 



1. Conductors - a single #18 American Wire Gage (AWG) tinned copper conductor 

 in a 0.58 mm (0.023 in.) polypropylene insulation at the center of the cable sur- 

 rounded by eight #22 AWG tinned copper conductors each in a 0. 30 mm (0.012 in.) 

 polypropylene insulation. Direct current (dc) resistance of the #18 and the #22 

 conductors are 21.69 and 55.45 ohms (fi) per kilometer, respectively. The conductor 

 bundle is held together by a mylar binder tape under a rayon braided jacket. 



2. Double Armor - eighteen-wire, 0.91 mm (0.036 in.) diameter per wire inner 

 armor and twenty-four-wire, 0.91 mm (0.036 in.) diameter per wire outer armor, both 

 galvanized improved plow steel. 



3. Ribbon Fairing - polyurethane strips 152 mm long, 11 mm wide, and 0.3 mm 

 (0.012 in.) thick applied in-line at a rate of 79 ribbons per meter for 120 m start- 

 ing at the depressor end of the cable. 



The total towcable length is approximately 1.22 km; this length will allow 

 several cable wraps to be left on the handling winch during towing. The cable is 

 mechanically terminated at the depressor end by a standard clevis-type, stainless- 

 steel socket manufactured by Electroline Products. A 3/8 in. (9.5 mm) size is used. 

 The termination is potted to the cable using a Shell 828/Versimide V40 epoxy matrix. 



REMOTE SENSOR MOUNT 



The remote sensor mount provides a method of placing CTD sensors at various 

 locations along the towcable. The mount is designed to locate the sensors forward 

 of the towcable as shown in Figure 6. The mount is fabricated from 6061-T6 aluminum 

 alloy. It is attached to the cable by an integral brass clamp. The method of 

 attachment is shown in Figure 7. 



The mount is design to freely pivot + 47 deg with respect to a plane normal to 

 the towcable axis as well as to pivot completely around the axis of the towcable. 

 Directional towing stability is provided by the drag of the remote sensor cable 

 which is attached to the aft end of the mount. During towing the remote sensor mount 

 will align with the axis of the remote sensor cable loop. The remote sensor cables 

 are secured at the depressor by a bracket which clamps to the towcable. 



11 



