Table 3. Armor Weight Requirements for Various Specific Gravities 



Class 



Specific 



Solid Weight 



Minimum Weight 



Thickness of 



Minimum Average Weight 





Gravity 



per ft^ (lbs) 



per Unit (tons) 



Two Layers (ft) 



per Unit (tons) 





Tetrapods 





A 



2.3 



143.5 



38.0 



18.3 





A 



2.4 



149.8 



31.0 



16.9 





A 



2.5 



156.0 



26.5 



15.0 





A 



2.6 



162.2 



22.5 



14.7 







A 



2.7 



168.5 



19.5 



13.9 





Armor Rock 



B 







29.0 



15.4 



32.0 



C 



2.25 



140.4 



12.0 



11.5 



13.0 



D 







6.0 



9.1 



6.5 



B 







23.0 



14.2 



26.0 



C 



2.35 



146.6 



10.0 



10.6 



11.0 



D 







5.0 



8.4 



5.5 



B 







20.0 



13.2 



22.0 



C 



2.45 



152.9 



8.25 



9.9 



9.25 



D 







4.25 



7.3 



4.5 



B 







17.0 



12.4 



19.0 



C 



2.55 



159.1 



7.0 



9.2 



7.75 



D 







3.5 



7.3 



4.0 



B 







14.0 



11.6 



16.0 



C 



2.65 



165.4 



6.0 



8.7 



6.75 



D 







3.0 



6.8 



3.5 



B 







13.0 



10.9 



14.0 



C 



2.75 



171.6 



5.25 



8.2 



5.75 



D 







2.75 



6.4 



3.0 



B 







11.0 



10.3 



12.0 



C 



2.85 



177.8 



4.5 



7.7 



5.0 



D 







2.25 



6.1 



2.5 



B 







10.0 



9.8 



11.0 



C 



2.95 



184.1 



4.0 



7.3 



4.5 



D 







2.0 



5.8 



2.25 



B 







8.5 



9.2 



9.25 



C 



3.05 



190.3 



3.5 



6.9 



4.0 



D 







1.75 



5.5 



2.0 



15 



