▁ ▁The ▁design ▁of ▁the ▁vessels ▁is ▁based ▁on ▁off sh ore ▁supply - t ug bo at ▁designs , ▁with ▁strength ened ▁ch ines . ▁The ▁vessel ▁has ▁a ▁tall ▁for ede ck , ▁and ▁a ▁long ▁low ▁quarter deck , ▁for ▁carrying ▁bu o ys , ▁where ▁a ▁c rane ▁with ▁a ▁cap ability ▁of ▁lif ting ▁ ▁is ▁perman ently ▁mounted . ▁The ▁c rane ▁is ▁motion ▁stabil ized . ▁Both ▁vessels ▁are ▁ ▁long ▁overall ▁with ▁a ▁beam ▁of ▁. ▁The ▁ice break ers ▁have ▁a ▁dra ug ht ▁of ▁. ▁Both ▁ships ▁dis place ▁ ▁with ▁Earl ▁Grey ▁having ▁a ▁ ▁and ▁a ▁ ▁and ▁Samuel ▁Ris ley ▁having ▁a ▁gross ▁t onn age ▁of ▁ 1 , 9 6 7 ▁and ▁a ▁net ▁t onn age ▁of ▁ 6 4 9 . 5 . ▁ ▁Earl ▁Grey ▁is ▁power ed ▁by ▁four ▁De utz ▁ 4 SA ▁ 9 - cy l inder ▁dies el - elect ric ▁engines ▁driving ▁two ▁cont roll able ▁pitch ▁prop ellers ▁that ▁create ▁. ▁This ▁gives ▁the ▁vessel ▁a ▁maximum ▁speed ▁of ▁. ▁The ▁vessel ▁has ▁a ▁capacity ▁of ▁ ▁of ▁dies el ▁fuel ▁that ▁gives ▁Earl ▁Grey ▁a ▁range ▁of ▁ ▁at ▁ ▁and ▁the ▁vessel ▁can ▁stay ▁at ▁sea ▁for ▁up ▁to ▁ 5 8 ▁days . ▁The ▁ship ▁is ▁equ ipped ▁with ▁one ▁C ater p ill ar ▁ 3 3 0 6 ▁emer gency ▁generator . ▁Samuel ▁Ris ley ▁is ▁power ed ▁by ▁four ▁W är ts