SECT. 5] DEEP-SEA ANCHORING AND MOORING 



This can be seen from the following force diagram : 



525 



T~snt 2 



D~t 



where D =drag force, and T =tension. 



A somewhat more discriminating comparison of mooring cables considers 

 their weight in water. For taut-wire moorings of small inclinations, the weight 

 (or buoyancy) can be considered to act in the same direction as the tension. 

 Thus, 



T ~ 6'77^-( / 0-l)(L^7762.4)/144 



and D~t, where /> = drag. 

 The tension /drag ratio is 



R' ~ t\s-0A{ P -l)L), 



where L =length in feet, and p =specific gravit} T of material. 



For the purposes of comparison of the tension/drag 

 Table I showing materials with the same tension/drag ratio. 



(2) 



(3) 



ratio consider 



Table I 



Thus, to attain the same tension/drag ratio under these circumstances as 

 for a \-\n. piano wire, the common cable will weigh ten times as much, and the 

 nylon eight times as much, in air. 1 



For this most critical component of a deep-ocean taut-moored system, the 

 two to three miles of mooring wire, two types of wire have been used, a solid 



1 Taut nylon moorings with no submerged float are now undergoing tests at Scripps. 

 They appear to be very satisfactory in regions of low current. 



