German torpedo boat T31
The German torpedo boat T31 was one of fifteen Type 39 torpedo boats built for the Kriegsmarine during World War II. Completed in early 1944, the boat was assigned to convoy escort duties and supporting German forces in the Baltic. She was sunk in combat with Soviet motor torpedo boats on 20 June off the Finnish coast on 20 June with 82 men killed.
Design and description
The Type 39 torpedo boat was conceived as a general-purpose design, much larger than preceding German torpedo boats. The boats had an overall length of and were long at the waterline. They had a beam of, a draft of at deep load and displaced at standard load and at deep load. Their crew numbered 206 officers and sailors. The Type 39s were fitted with a pair of geared steam turbine sets, each driving one propeller, using steam from four high-pressure water-tube boilers. The turbines were designed to produce which was intended give the ships a maximum speed of. They carried enough fuel oil to give them a range of at.As built, the Type 39 ships mounted four SK C/32 guns in single mounts protected by gun shields; one forward of the superstructure, one between the funnels, and two aft, one superfiring over the other. Anti-aircraft defense was provided by four SK C/30 AA guns in two twin-gun mounts on platforms abaft the rear funnel and a dozen C/38 guns. One quadruple mount was positioned on the aft superstructure and two more were fitted on the bridge wings. They carried six above-water torpedo tubes in two triple mounts amidships and could also carry 30 mines; the full complement of 60 mines made the ships top-heavy which could be dangerous in bad weather. For anti-submarine work the boats were fitted with a S-Gerät sonar and four depth charge launchers. The Type 39s were equipped with a FuMO 21 radar and various FumB radar detectors were installed late in the war.