S138-class torpedo boat

	SMS V150 underway c. 1908
Class overview
Builders	Schichau (S), AG Vulcan (V), Germaniawerft (G)
Operators	Imperial German Navy; Ottoman Navy;
Preceded by	S90 class
Built	1906–1911
In commission	1907–1945
Completed	65
General characteristics
Type	Torpedo boat
Displacement	533 to 700 tonnes (525 to 689 long tons) designed; 684 to 824 tonnes (673 to 811 long tons) full load;
Length	70.7 to 74.2 m (231 ft 11 in to 243 ft 5 in) o/a
Beam	7.8 to 7.9 m (26 to 26 ft)
Draft	2.75 to 3.06 m (9 ft 0 in to 10 ft 0 in) (forward)
Installed power	S138–V160:; 4 × coal-fired water tube boilers; 10,500 to 10,800 indicated horsepower (10,600 to 11,000 PS); V162–G197:; 3 × coal-fired water tube boilers; 1 × oil-fired water tube boiler; 14,800 to 17,400 shaft horsepower (15,000 to 17,600 PS);
Propulsion	S138–V160:; 2-shaft VTE; V161–S168, G173–197:; 2-shaft steam turbines; G169–172:; 3-shaft steam turbines;
Speed	30 to 32 kn (56 to 59 km/h; 35 to 37 mph)
Complement	3 officers; 77–81 enlisted;
Armament	S138–149:; 1 × 8.8 cm (3.46 in) SK L/35 gun; 3 × 5 cm (2.0 in) SK L/40 guns; 3 × 45 cm (17.7 in) torpedo tubes; V150–155:; 2 × 8.8 cm SK L/35 guns; 3 × 45 cm torpedo tubes; V156–G197:; 1 × 8.8 cm (3.46 in) SK L/35 gun; 2 × 5.2 cm (2 in) SK L/55 guns; 3 × 46 cm torpedo tubes;

The S138 class was a group of sixty-five torpedo boats built for the German Kaiserliche Marine (Imperial Navy) and the Ottoman Navy in the early 1900s. Almost all of the boats served with the German fleet, with only four being sold to the Ottoman Empire in 1910. The German and Ottoman boats saw action in World War I, and several were lost. One Ottoman boat successfully torpedoed and sank a British battleship in 1915. In 1917 and 1918, the German members of the class were all renamed to replace the builder prefix with a standardized "T" prefix. Following Germany's defeat, many of the members of the S138 class were scrapped, either after having been seized as war prizes by the victorious Allied powers or by Germany to comply with the naval disarmament clauses of the Treaty of Versailles. Some boats continued in German service through World War II, after which the surviving vessels were all seized as war prizes.

^ Gröner, p. 172.
^ Gröner, p. 173.

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[FOOTNOTEGröner172-1] Gröner, p. 172.

[FOOTNOTEGröner173-3] Gröner, p. 173.

[a]

[b]

Class overview
SMS V150 underway c. 1908
Builders	Schichau (S), AG Vulcan (V), Germaniawerft (G)
Operators	Imperial German Navy Ottoman Navy
Preceded by	S90 class
Built	1906–1911
In commission	1907–1945
Completed	65
General characteristics
Type	Torpedo boat
Displacement	533 to 700 tonnes (525 to 689 long tons) designed 684 to 824 tonnes (673 to 811 long tons) full load
Length	70.7 to 74.2 m (231 ft 11 in to 243 ft 5 in) o/a
Beam	7.8 to 7.9 m (26 to 26 ft)
Draft	2.75 to 3.06 m (9 ft 0 in to 10 ft 0 in) (forward)
Installed power	S138–V160: 4 × coal-fired water tube boilers 10,500 to 10,800 indicated horsepower (10,600 to 11,000 PS)^[a] V162–G197: 3 × coal-fired water tube boilers 1 × oil-fired water tube boiler 14,800 to 17,400 shaft horsepower (15,000 to 17,600 PS)
Propulsion	S138–V160: 2-shaft VTE V161–S168, G173–197: 2-shaft steam turbines G169–172: 3-shaft steam turbines
Speed	30 to 32 kn (56 to 59 km/h; 35 to 37 mph)
Complement	3 officers 77–81 enlisted
Armament	S138–149: 1 × 8.8 cm (3.46 in) SK L/35 gun 3 × 5 cm (2.0 in) SK L/40 guns 3 × 45 cm (17.7 in) torpedo tubes V150–155: 2 × 8.8 cm SK L/35 guns 3 × 45 cm torpedo tubes V156–G197: 1 × 8.8 cm (3.46 in) SK L/35 gun 2 × 5.2 cm (2 in) SK L/55 guns 3 × 46 cm torpedo tubes^[b]