Design
The U-7 class was seen by the Austro-Hungarian Navy as an improved version of its U-3 class, which was also a Germaniawerft design. As designed for the Austro-Hungarian Navy, the boats were to displace 695 tonnes (766 short tons) on the surface and 885 tonnes (976 short tons) while submerged. The doubled-hulled boats were to be 228 feet (69 m) long (OA) with a beam of 20 feet 8 inches (6.30 m) and a draft of 12 feet 5 inches (3.78 m). The Austrian specifications called for two shafts with twin diesel engines (2,300 brake horsepower (1,700 kW) total) for surface running at up to 17 knots (31 km/h), and twin electric motors (1,240 shaft horsepower (920 kW) total) for a maximum of 11 knots (20 km/h) when submerged.
The boats were designed with five 45 cm (17.7 in) torpedo tubes; four located in the bow, one in the stern. The boats' armament was to also include a single 6.6 cm (2.6 in)/26 deck gun.
Read more about this topic: German Type U 66 Submarine
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