n 



4 6 



Speed in knots 



Figure 8 - Loading Curves Obtained from 

 Paired-Weight Calibrations 



is the difference between the measured drag F of the system and the drag D^ of 

 the weight and its towline as read from the calibration curve, or 



D = F - Do [5] 



Since a long line was used for towing the system, the angles made by this line 

 at the protractor were of the order of 5 to 8 degrees from the horizontal. As 

 a result, the fluid force on the cable was primarily tangential drag. Since 

 the cable diameter was only l/l6 inch, this force and the curvature of the 

 cable could be neglected in the analyzis of the data. 



The load on the float consists of its own weight and the algebraic 

 sura of the vertical components of the tensions in the faired weight and for- 

 ward towlines, i.e., 



