▁prop eller ▁sh aft . ▁The ▁tur bine ▁was ▁designed ▁to ▁produce ▁, ▁using ▁steam ▁provided ▁by ▁ 2 ▁C - E ▁bo ilers , ▁to ▁reach ▁the ▁designed ▁speed ▁of ▁. ▁The ▁Kno x ▁class ▁had ▁a ▁range ▁of ▁ ▁at ▁a ▁speed ▁of ▁. ▁ ▁The ▁Kno x - class ▁ships ▁were ▁armed ▁with ▁a ▁ 5 "/ 5 4 ▁cal iber ▁Mark ▁ 4 2 ▁gun ▁forward ▁and ▁a ▁single ▁ 3 "/ 5 0 ▁cal iber ▁gun ▁a ft . ▁They ▁mounted ▁an ▁eight - round ▁AS RO C ▁launch er ▁between ▁the ▁ 5 - inch ▁( 1 2 7   mm ) ▁gun ▁and ▁the ▁bridge . ▁Close - range ▁anti - sub marine ▁defense ▁was ▁provided ▁by ▁two ▁tw in ▁ ▁M k ▁ 3 2 ▁tor ped o ▁tub es . ▁The ▁ships ▁were ▁equ ipped ▁with ▁a ▁tor ped o - car ry ing ▁D ASH ▁dr one ▁hel ic opter ; ▁its ▁teles cop ing ▁hang ar ▁and ▁landing ▁pad ▁were ▁position ed ▁amid ships ▁a ft ▁of ▁the ▁m ack . ▁Begin ning ▁in ▁the ▁ 1 9 7 0 s , ▁the ▁D ASH ▁was ▁replaced ▁by ▁a ▁SH - 2 ▁Se as pr ite ▁LA MP S ▁I ▁hel ic opter ▁and ▁the ▁hang ar ▁and ▁landing ▁deck ▁were ▁accordingly ▁en larg ed . ▁Most ▁ships ▁also ▁had ▁the ▁ 3 - inch ▁( 7 6   mm ) ▁gun ▁replaced ▁by ▁an ▁eight - cell ▁B PD MS ▁miss