TABLE 1 



Characteristics of NRL Platform (FORDS) 



Principal Dimensions 



Length 242 ft 



Breadth 225 ft 



Height (legs retracted) 340 ft 



Dynamic Properties of Displacement Condition 1 



Vertical Distance of Center of Gravity above Base of Platform 

 Vertical Distance of Metacenter above Base of Platform (about Roll Axis^ 

 Pitch Gyradius 

 Roll Gyradius 



52, 



,8 



ft 



284, 



.6 



ft 



94, 



.2 



ft 



96, 



,2 



ft 



Test Conditions 



Displacement 



Draft 

 ft 



1 



30 



2 



30 



3 



42 



4 



265 



5. 



125 



'Weight 

 Long Tons 



13^510 

 13,950 

 17,260 

 19,220 

 13,920 



Natural Periods, Sec 

 Pitch Heave Roll 



13.4 



5.3 



8.7 



13.8 



5.6 



10.6 



51.5 



22.7 



25.5 



50.8 



123.3 



55.1 



59.4 



126.5 



62,5 



See Reference 2 for detailed dimensions. 



These properties were changed for each displacement condition by filling selected 

 ballast tanks with water and chemical salts. These particular tanks were suffi- 

 ciently filled such that free surface effects can be ignored. 



