This submarine type was the first to have a diesel engine instead of the petroleum-fired machines. The new propulsion system made the boats safer and granted a longer range. The boats were built at the Kaiserliche Werft shipyard in Danzig before the war and commissioned from 1911 to 1913. Performance Endurance: 14083 km Maximum speed: 15 kts Armour Protection Armour: 1 Armament 1 x 8,8cm Ubts K L/30. Ammo: 150 rounds 4 x 50cm G/6 Torpedo. Ammo: 6 torpedoes - U 19