Design and Construction
The submarine was built to the German Type VIIC design. She had a displacement of 769 tonnes (757 long tons) when surfaced, and 871 t (857 long tons) when submerged. The boat was 67.1 metres (220 ft 2 in) long, with a beam of 6.2 metres (20 ft 4 in), and a draught of 4.74 metres (15 ft 7 in). The diesel-electric propulsion system provided a maximum speed of 18.8 knots (34.8 km/h; 21.6 mph) surfaced or 7.6 knots (14.1 km/h; 8.7 mph) submerged. The U-570 had a fuel capacity of 109 long tons (111 t) which gave a range of 7,500 nautical miles (13,900 km) at 10 knots (19 km/h; 12 mph). The test depth of the submarine was 230 metres (750 ft).
The main armament consisted of five 21 inches (533 mm) torpedo tubes; four in the bow, and the fifth in the stern. A total of 14 torpedoes could be carried – five in the torpedo tubes, seven reloads inside the pressure hull and a further two in water–tight canisters outside the pressure hull. The boat was fitted with a C35 88 mm/L45 deck gun (with around 150 rounds of ammunition) and a 2cm Flak 30 anti-aircraft gun. A 28 cm Stereoscopic rangefinder was carried for use with the anti-aircraft gun, and a number of machine guns were also carried.
U-570 was laid down by Blohm & Voss at Hamburg on 21 May 1940. The submarine was launched on 20 March 1941.
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