German Type U 87 submarine

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Class overview
Builders: Germaniawerft, Kiel and Kaiserliche Werft Danzig
Operators:  Kaiserliche Marine
Preceded by: Type U 81
Succeeded by: Type U 93
Completed: 6
Lost: 4
General characteristics
Displacement: 757 tonnes (745 long tons)(surfaced)
998 tonnes (982 long tons) (submerged)[1]
1165 tons (total)
Length: 65.8 m (216 ft) (overall)[1]
50.07 m (pressure hull)
Beam: 6.2 m (20 ft) (overall)[1]
4.18 m (pressure hull)
Draught: 3.88 m (12.7 ft)[1]
Propulsion: 2,400 hp (1,800 kW) (surfaced)
880 kilowatts (1,180 hp) (submerged)[1]
Speed: 15.6 knots (28.9 km/h; 18.0 mph) (surfaced)
8.6 knots (15.9 km/h; 9.9 mph) (submerged)[1]
Range: 11,380 nautical miles (21,080 km; 13,100 mi) @ 8 kn (surfaced); 56 nautical miles (104 km; 64 mi) @ 5 kn miles (submerged)[1]
Test depth: ~50 m (160 ft)
Complement: 36 men
Armament: Four 50 cm (20 in) torpedo tubes forward and two 50cm torpedo tubes aft with 16 torpedoes
10.5 cm (4.1 in) deck gun with 140 rounds
[2] plus one 8.8 centimetres (3.5 in) deck gun (only U-87, U-89)

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

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 11,220 nautical miles (20,780 km; 12,910 mi). 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 metres (14.0 ft) shorter, while the pressure hull was shortened .48 metres (1 ft 7 in).[3] They were 1.2 knots (2.2 km/h; 1.4 mph) slower on the surface, and .5 knots (0.93 km/h; 0.58 mph) slower submerged, but increased range by 180 nautical miles (330 km; 210 mi) to 11,380 nautical miles (21,080 km; 13,100 mi) 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 metres (18.9 ft) shorter, with the pressure hull 5.98 metres (19.6 ft) shorter and 105 tons lighter.[4] Their range was 2,288 nautical miles (4,237 km; 2,633 mi) longer, but speed was 1.2 knots (2.2 km/h; 1.4 mph) slower on the surface and unchanged submerged.

Type 87 boats were responsible for sinking 2.218% of all allied shipping sunk during the war, taking a total of 285,019 gross register tons (GRT). They also damaged 36,271 GRT.

Boat Sunk Damaged Total
U-87 59,884 7,638 68,522
U-88 39,382 845 40,227
U-89 8,496 8,496
U-90 74,177 8,594 82,771
U-91 87,119 11,821 98,940
U-92 15,961 7,373 23,334
Totals 285,019 36,271 321,290

References[edit]

  1. ^ a b c d e f g Encyclopedia of U-boats (2004), London:Greenhill Books, ISBN 1-85367-623-3, p.33
  2. ^ Uboat.net Type 87
  3. ^ Uboat.net type 81
  4. ^ Uboat.net type 93

External links[edit]