class of torpedo boat were designed to be more seaworthy. The requirements for
the 1935 class were maximum displacement of 600 tons but that was exceeded to
nearly double, In reality these ships were overweight at roughly 900 tons. Also
higher speeds were required to accomplish this, high pressure turbines were put
to use but these were unreliable and hard to repair and maintain in the confined
space. The low displacement meant they were unseaworthy which was only partly
sorted out by 1940. The ships were numbered from T1 to T12.
German Warships, 1815-1945: Major Surface Vessels.
German Warships, 1815-1945: U-boats and Mine Warfare Vessels.
German warships of the Second World War.
For a complete list of sources