line-drawing of köln
köln 174 meters (571 ft) long overall , had beam of 15.2 m (50 ft) , maximum draft of 6.28 m (20.6 ft). displaced 7,700 long tons (7,800 t) @ full combat load. propulsion system consisted of 4 steam turbines , pair of 10-cylinder four-stroke diesel engines. steam turbines provided 6 marine-type double-ended oil-fired boilers. ship s propulsion system provided top speed of 32 knots (59 km/h; 37 mph) , range of approximately 5,700 nautical miles (10,600 km; 6,600 mi) @ 19 knots (35 km/h; 22 mph). köln had crew of 21 officers , 493 enlisted men.
the ship armed 9 15 cm sk c/25 guns mounted in 3 triple gun turrets. 1 located forward, , 2 placed in superfiring pair aft. rear gun turrets offset increase arc of fire. supplied 1,080 rounds of ammunition, 120 shells per gun. ship equipped 2 8.8 cm sk l/45 anti-aircraft guns in single mounts; had 400 rounds of ammunition each. köln carried 4 triple torpedo tube mounts located amidships; supplied twenty-four 50 cm (20 in) torpedoes. capable of carrying 120 naval mines. ship protected armored deck 40 mm (1.6 in) thick amidships , armored belt 50 mm (2.0 in) thick. conning tower had 100 mm (3.9 in) thick sides.
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