SYSTEM DESIGN 

 SYSTEM CONSIDERATIONS 



This study is concerned with means for providing con- 

 tinuous underway measurement of ocean variables at a number 

 of points in a vertical profile. The design of a towed- 

 instrument system, with a flexible towing member providing 

 both data link and support, is presented. 



The problem consisted essentially of finding a configura- 

 tion to provide the required 5000-foot depth, utilizing a 

 towing link of sufficient dimensions to accommodate the 

 data-transmission function and also providing a reasonable 

 margin of reserve strength at a specified towing speed without 

 imposing unusual demands on handling gear. 



The first step in the solution of this problem was the 

 establishment of the relationship between the towing link 

 and the forces required to maintain it in the desired con- 

 figuration. The towing link was specified from the results 

 of these studies, in:: orporating data-transmission requirements, 

 A depressor was then designed, achieving the required force 

 characteristics without unreasonable size and weight penalties. 



Instrument containers, compatible with this towing link 

 were then investigated and winching equipment selected. 



As the interdependent requirements can be most conveniently 

 discussed in conjunction with particular components, detailed 

 considerations are presented in the appropriate following sections, 



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