ADDITIONAL CONSIDERATIONS 



Since completion of the preliminary design, further 

 information concerning the hydrodynamic resistance of 

 faired cables has come to hand. Results of recent tests on 

 faired cable (7) show that the minimum value of the resis- 

 tance coefficient to tbe expected for TF-84 fairing is 

 closer to 0.3 than 0.2 in the Reynolds* number range charac- 

 teristic of the present system. 



In light of this information, a study was made of the 

 effects of resistance coefficient and cable-loading assump- 

 tions on the performance of the system. A digital computer 

 solution based on Whicker 's loading assumptions, with a 

 resistance coefficient of 0.3 and using computed values for 

 the cable angle at the depressor (84 degrees at the 7^-knot 

 speed) was provided by the David Taylor Model Basin. Calcu- 

 lations based on Eames ' assumptions, using computed values 

 for the cable angles and resistance coefficients of 0.2 and 

 0.3, were also made. Results are tabulated below for a 

 towing speed of 7% knots, and are shown as a function of 

 speed on Figure III-l. The results at 7% knots given in 

 (2); based on Eames' method, a resistance coefficient of 0.2, 

 and a cable angle at the depressor of 90 degrees, are included 

 in the table for comparison. 



III. 3 



