Type U 3 submarine
Type U '3' was a class of U-boats built during World War I by the Kaiserliche Marine. The two Type U 3 boats were ordered on 13 August 1907 from the Kaiserliche Werft Danzig. They had more powerful engines than the previous U 2 and were far more reliable.
Design
Type U 3s had an overall length of The boats' beam was, the draught was. The boats displaced when surfaced and when submerged.Type U 3s were fitted with two Körting 8-cylinder two-stroke paraffin engines with a total of for use on the surface and two SSW double-acting electric motors with a total of for underwater use. These engines powered two shafts, which gave the boats a top surface speed of, and when submerged. Cruising range was at on the surface and at submerged. Constructional diving depth was.
The U-boats were armed with four torpedo tubes, two fitted in the bow and two in the stern. They carried six C/06 torpedoes instead of the older C/03 torpedo. C/06 torpedoes were slightly larger than the preceding C/03, they had a more powerful propulsion unit and could be fired under an angle. The boats' complement was 3 officers and 19 enlisted. Until the end of 1914, the Type U 3 U-boats could be equipped with a rotating Hotchkiss gun, and after 1915 U-3 was occasionally equipped with an extra 5 cm SK L/40 gun.