The towed body used in the experimental phase of the investigation is 

 also shown in Figure 2. The towed body is a body of revolution constructed 

 of fiberglass and is equipped with a depressing wing located on its 

 horizontal centerline and has a set of control surfaces located on its aft 

 section to provide the necessary stabilizing forces. Table 2 gives all the 

 pertinent information of the body and cable. 



An instrument package, housed within the towed body, contains the 

 transducers and electronics to measure the hydrodynamic parameters. 

 A pressure transducer was used to obtain the depth. Roll, pitch, and 

 cable angle at the body were obtained with pendulum potentiometers. The 

 tension at the body was obtained with a strain-gage element in the towstaff . 

 All the data from the body was transmitted through the towcable to ship- 

 board recorders. At the shipboard end, the cable angle was measured 

 with a potentiometer- transducer and the cable tension was obtained from a 

 strain-gaged load cell. A modified version 10 of the DTMB Mark 1 Knot- 

 meter 11 was used during the tests to obtain the towing speed of the ship 

 relative to the water. A complete description of the instrument package 

 and components is given in Reference 10. Although the tension produced 

 by the body at high speeds exceeded the design measurement range of the 

 tension gage by about 30 percent, it is felt that this should not significantly 

 affect the accuracy of the measurements. 



TABLE 2 

 Physical Characteristics of Cable and Body 



Cable 







Diameter, inches 



Weight in sea water, pounds per foot 



Number of electrical conductors 



0. 

 0. 

 8 



350 

 169 



Body 







Overall length, inches 

 Maximum diameter, inches 

 Fineness ratio 

 Weight in sea water, pounds 



61 



14 



4 



100 





 5 

 2 

 



Wing 







Span, inches 



Planform area, square inches 

 Aspect ratio 



Incidence angle (leading edge down), 

 degrees 



32 

 362 

 2. 



6. 



5 

 

 9 







Tail Fins (Horizontal and Vertical) 







Span, inches 



Planform area, square inches 



Aspect ratio 



Incidence angle, degrees 



20 



202 



2 







6 

 

 1 



Shroud Ring 







Diameter, inches 



Chord, inches 



Total area, square inches 



20 



4 



320 



6 

 9 

 



