S90-class torpedo boat
S90 in Kiel, c. 1901
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| Class overview | |
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| Builders: | Schichau (S), AG Vulcan (V), Germaniawerft (G) |
| Operators: |
 Kaiserliche Marine
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| Built: | 1899—1907 |
| In commission: | 1889—1921 |
| Completed: | 48 |
| General characteristics | |
| Class and type: | S90 class |
| Displacement: |
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| Length: | 65.70 m (215 ft 7 in) o/a |
| Beam: | 7 m (23 ft) |
| Draught: | 2.63 m (8 ft 8 in) |
| Propulsion: |
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| Speed: | 28 kn (52 km/h; 32 mph) |
| Range: | 2,000 nmi (3,700 km; 2,300 mi) at 12 knots (22 km/h; 14 mph) |
| Complement: | 2 officers, 67 enlisted |
| Armament: |
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The S90 class of torpedo boats was a group of large torpedo boats built for the German Imperial Navy (Kaiserliche Marine) in the early 20th century. They were Hochsee-Torpedoboot ("High seas torpedo boat") built to varying designs by Germaniawerft, Schichau, and AG Vulcan. German torpedo boats were designated by shipbuilder, with the first letter of their designation reflecting their builder.
The boats of the S90 class varied in dimensions, and they gradually increased in size as more vessels were built. The boats were 62.7 to 68.5 meters (206 to 225 ft) long at the waterline and 63 to 71.5 m (207 to 235 ft) long overall. They had beam (nautical) of 7 to 7.65 m (23.0 to 25.1 ft) and a draft of 2.03 to 3.22 m (6 ft 8 in to 10 ft 7 in). The hull for each boat was divided into eleven watertight compartments, though after G132, a twelfth compartment was added. They had a crew of two officers and fifty-five enlisted men, though some of the boats had larger crews; S120 had four more sailors, while G132 had twelve more men, and G131 had a crew of three officers and 78 enlisted. When serving as half-flotilla flagships, the boats would have a flotilla leader's staff of four officers and eleven enlisted men in addition to the standard crew. The vessels carried a yawl and a dinghy apiece.
The S90-class boats were propelled by a pair of vertical, 3-cylinder triple expansion steam engines that drove a pair of three-bladed screw propellers. Steam was provided by three coal-fired water-tube boilers. Two boats, S125 and G137, were fitted with Parsons steam turbines instead of the older reciprocating engines; G137 also received an additional boiler. The reciprocating engine-powered boats were rated at 27 to 30 knots (50 to 56 km/h; 31 to 35 mph) from 5,900 to 7,000 indicated horsepower (4,400 to 5,200 kW). Meanwhile, S125 and G137 were rated at 6,600 shaft horsepower (4,900 kW) and 28 knots (52 km/h; 32 mph), and 10,800 shp (8,100 kW) and 30 knots (56 km/h; 35 mph), respectively. The boats had storage capacity for 93 to 168 t (92 to 165 long tons; 103 to 185 short tons) of coal. As a result, cruising radius varied significantly, from 830 to 1,500 nautical miles (1,540 to 2,780 km; 960 to 1,730 mi) at 17 knots (31 km/h; 20 mph). Each vessel was equipped with one or two 4 to 8 kilowatts (5.4 to 10.7 hp) 110-Volt generators for electrical power. Steering was controlled with a pair of rudders, one at the stern and the other in the bow.
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