Construction 



Cable fairing must conform to the curvature of the 

 cable catenary; to reduce stress buildup, the trailing edge 

 is generally constructed of a more elastic compound than 

 is the fore part of the fairing. The line of demarcation 

 between the harder and softer rubber compounds in a typical 

 construction may be seen in Figure 1-4 as the change in 

 shading near the trailing edge of the fairing, just aft 

 of the screws used for attaching the clips. 



To reduce costs, without impairing performances the 

 possibility of using a single-durometer compound was con- 

 sidered. The substitution of a single-durometer compound 

 for the two-durcmeter construction can be justified only if 

 a fairing so constructed retains its hydrodynamic stability. 



The destabilizing moments acting on the fairing are 

 those due to bending as a result of cable curvature, and 

 those due to axial loads resulting from accumulation of the 

 tangential component of the external loading. Ihe result^ 

 derived in Appendix IVt is a moment per unit length. 



Lg + L^ = (IECq^ + TC^y) * [1] 



1. 11 



