12 



TABLE 2 



Holding Power and Safety Factors for Various Lengths and 

 Diameters of Wire Rope for Conditions of Example 



00 



degrees 



S 



T 



W7 



JJL 

 WY 



To 



pounds 



Safety 

 Factor 



Holding 



Power 

 Required 



pounds 







d 



=1.0 Inch 











7 



21 



3.8 



3 



2 



5.10 



5-4 



6.55 



9.05 

 9.25 

 9.94 



20,200 

 20,800 

 22,500 



3.08 

 3.01 



2.80 



20,200 

 23,700 

 35,500 







d 



= 1 .5 Inch 









 13.3 



2.75 

 2 



3.80 

 4.i6 



5.04 

 5-30 



22,900 

 24,400 



5.52 



5.24 



22,900 

 31,700 







d = 



=2.0 Inches 









 7.5 



2.27 

 2 



3.10 

 3.15 



3.62 

 3.65 



26,400 

 26,700 



7.68 

 7.61 



26,400 

 30,700 







d = 



=2.5 Inches 







0.5 



2 



2J0 



2.96 



30,900 



9.40 



31,200 



of 35,000 pounds. This would require a lightweight (LWT) anchor of about 

 1750 pounds if the experimental value for the holding power of a lightweight 

 anchor as recommended by the Bureau of Ships, 20 pounds per pound of anchor 

 weight, is assumed. A safety factor of 5 would require a cable of 1.5-inch 

 diameter with a 1580-pound anchor. 



REFERENCES 



(1) Telephone conversation of 23 March 1945 between Comdr. P.W. 

 Snyder, USN, BuShips, Hull Design (440), and Comdr. E.A. Wright, USN, David 

 Taylor Model Basin. 



(2) "Investigation of Anchor Characteristics by Means of Models," 

 by W.E. Howard and R.K. James, Student Thesis, Massachusetts Institute of 

 Technology, 1933- 



(3) "Determining Anchor Holding Power from Model Tests," by W.H. 

 Leahy and J.M. Farrin, Jr., Transactions of the Society of Naval Architects 

 and Marine Engineers, Vol. 43, 1935- 



