One 50 cm (20 in) torpedo tubes forward and one 50 cm torpedo tubes aft
plus one 8.8 cm (3.5 in) or 10.5 cm (4.1 in) deck gun
two minelaying tubes for 38 mines
The German Type UE I submarine was an ocean-going single-hull submarine with saddle tanks built by AG Vulkan in Hamburg and Kaiserliche Werft Danzig. The Type UE I was equipped with two six-cylinder Benz engines for 900 horsepower (670 kW) for a surface top speed of 9.6 knots (17.8 km/h; 11.0 mph) to 10.6 knots (19.6 km/h; 12.2 mph). Armed with a single torpedo tube forward and aft, plus one 8.8 cm (3.5 in) deck gun (U-72 received a 10.5 cm (4.1 in) gun in 1917), its main weapon were the 38 mines in two minelaying tubes. The boats were crewed by four officers and 28 men for a complement of 32.