 The ships were also armed with submerged torpedo tubes in their hulls . Derfflinger was equipped with four 50 cm tubes ; the later ships were armed with more powerful 60 cm weapons . The tubes were arranged with one in the bow , one in the stern , and two on the broadside . Derfflinger 's 50 cm torpedoes were the <unk> type , 7 @.@ 02 m ( 276 in ) long and armed with a 195 kg ( 430 lb ) <unk> warhead . The torpedo had a range of 4 @,@ 000 m ( 4 @,@ 370 yd ) when set at a speed of 37 knots , and up to 9 @,@ 300 m ( 10 @,@ 170 yd ) at 27 knots . The 60 cm torpedoes were the <unk> type , which were 8 m long and carried a 210 kg ( 463 lb ) <unk> warhead . The torpedoes had a range of 6 @,@ 000 m ( 6 @,@ 550 yd ) when set at a speed of 36 knots ; at a reduced speed of 30 knots , the range increased significantly to 14 @,@ 000 m ( 15 @,@ 310 yd ) . 
