▁ ▁Design ▁The ▁St al wart - class ▁ocean ▁surve ill ance ▁ships ▁were ▁succeeded ▁by ▁the ▁longer ▁Victor ious - class ▁ocean ▁surve ill ance ▁ships . ▁Pers istent ▁had ▁an ▁overall ▁length ▁of ▁ ▁and ▁a ▁length ▁of ▁ ▁at ▁its ▁water line . ▁It ▁had ▁a ▁beam ▁of ▁ ▁and ▁a ▁draft ▁of ▁. ▁The ▁surve ill ance ▁ship ▁had ▁a ▁disp lacement ▁of ▁ ▁at ▁light ▁load ▁and ▁ ▁at ▁full ▁load . ▁It ▁was ▁power ed ▁by ▁a ▁dies el - elect ric ▁system ▁of ▁four ▁C ater p ill ar ▁D - 3 9 8 ▁dies el - power ed ▁gener ators ▁and ▁two ▁General ▁Electric ▁ ▁electric ▁mot ors . ▁This ▁produced ▁a ▁total ▁of ▁ ▁that ▁drove ▁two ▁sh aft s . ▁It ▁had ▁a ▁gross ▁register ▁t onn age ▁of ▁ 1 , 5 8 4 ▁and ▁a ▁dead weight ▁t onn age ▁of ▁ 7 8 6 . ▁ ▁The ▁St al wart - class ▁ocean ▁surve ill ance ▁ships ▁had ▁maximum ▁spe eds ▁of ▁. ▁They ▁were ▁built ▁to ▁be ▁fitted ▁with ▁the ▁Sur ve ill ance ▁T owed ▁Array ▁S ensor ▁System ▁( S UR TA SS ) ▁system . ▁The ▁ship ▁had ▁an ▁end urance ▁of ▁thirty ▁days . ▁It ▁had ▁a ▁range ▁of ▁ ▁and ▁a ▁speed ▁of ▁. ▁Its ▁complement ▁was ▁between ▁thirty - two ▁and ▁forty - se ven . ▁Its ▁h ull ▁design ▁was ▁similar ▁to ▁that ▁of ▁the ▁Pow hat an - class ▁fleet ▁ocean