APPENDIX I 



TOWED SYSTEM CQMPONEITT DEVELOPMENT 



GENERAL 



Details relevant to the major ccanponents of the towed 

 system, including requirements, design approach, develop- 

 ment, and resulting characteristics are discussed in this 

 Appendix. 



DEPRESSOR 



Requiraitents 



Based on the analysis presented in (2) „ the depressor 

 was required to provide a total downforce of 4^450 pounds 

 at a towing speed of 7% knots. Since its only function was 

 the provision of downforce, it seemed reasonable to require 

 that the depressor be inexpensive. 



Design Approach 



The total downforce was developed by a combination of 

 weight and hydrodynamic depression for the reasons dis- 

 cussed in (2) . The following specific objectives were 

 established: 



Weight in water 1 , 000 pounds 



Hydrodynamic downforce 3;,450 poxinds 



Arctan (downforce/drag) ^ 84 degrees 



1,2 



