 Her main armament consisted of two breech @-@ loading ( BL ) 9 @.@ 2 @-@ inch ( 234 mm ) Mk X guns in single gun turrets , one each fore and aft of the superstructure . They fired 380 @-@ pound ( 170 kg ) shells to a range of 15 @,@ 500 yards ( 14 @,@ 200 m ) . Her secondary armament of sixteen BL 6 @-@ inch Mk VII guns was arranged in casemates amidships . Eight of these were mounted on the main deck and were only usable in calm weather . They had a maximum range of approximately 12 @,@ 200 yards ( 11 @,@ 200 m ) with their 100 @-@ pound ( 45 @.@ 4 kg ) shells . A dozen quick @-@ firing ( QF ) 12 @-@ pounder 12 cwt guns were fitted for defence against torpedo boats . Two additional 12 @-@ pounder 8 cwt guns could be dismounted for service ashore . Good Hope also carried three 3 @-@ pounder Hotchkiss guns and two submerged 17 @.@ 72 @-@ inch ( 450 mm ) torpedo tubes . 
