Type U 87 submarine

Type 87 was a class of U-boats built during World War I by the Kaiserliche Marine.

Design
Type 87 U-boats carried 16 torpedoes and had various arrangements of deck guns. U 87 and U 89 had one 10.5 cm/45 and one 8.8 cm deck gun, U 88 was probably equally armed. U 90 - U 92 were armed with one 10.5 cm/45 gun (140-240 rounds).

They carried a crew of 36 and had excellent seagoing abilities with a cruising range of approximately 11220 nmi. Many arrangements from the Type 81, 87, and 93 were also seen on the World War II Type IX U-boats when their design work took place 20 years later.

Compared to the previous type 81, the 87s were 4.26 m shorter, while the pressure hull was shortened .48 m. They were 1.2 kn slower on the surface, and .5 kn slower submerged, but increased range by 180 nmi to 11380 nmi at 8 knots. They carried 16 torpedoes instead of 12. As with the previous type, there was a mixture of guns. Crew size was increased by 1 to 36.

Compared to the following type 93, the 87s were 5.75 m shorter, with the pressure hull 5.98 m shorter and 105 tons lighter. Their range was 2,288 nmi longer, but speed was 1.2 kn slower on the surface and unchanged submerged.

Service history
Type 87 boats were responsible for sinking 2.218% of all allied shipping sunk during the war, taking a total of 284,961 combined tons. They also damaged 36,595 combined tons.