S-class torpedo boat

Torpedo boat S1
Class overview
Name	S
General characteristics
Type	Torpedo boat
Displacement	290 tons (S1-S5) 186 tons (S6)
Length	57.9 m (190.0 ft) (S1-S5) 52.35 m (171.75 ft) (S6)
Beam	5.6 m (18.4 ft) (S1-S5) 5.25 m (17.22 ft) (S6)
Draught	1.7 m (5.6 ft) (S1-S5) 1.47 m (4.82 ft) (S6)
Propulsion	2 × steam engines, 4 Yarrow boilers; 3,800 hp (2,834 kW)
Speed	27 knots (50 km/h; 31 mph) (S1-S5) 26 knots (48 km/h; 30 mph) (S6)
Range	550 nmi (1,019 km; 633 mi) at 15 knots (28 km/h; 17 mph) (S1-S5)
Complement	53 (S1-S5) 32 (S6)
Armament	S1-S5: 2 × 75 mm/50 2 × 456 mm torpedo tubes 2 × machine guns 14-18 mines S6: 3 × 47 mm 2 × 380 mm torpedo tubes 14-18 mines

The Finnish S-class torpedo boats was a series of six ex-Russian torpedo boats that had been taken over by the Finns after the Russian Revolution and the Finnish Civil War.

S1 through S5 belonged to the Russian Sokol-class torpedo boat destroyers, while S6 was of the smaller Modified Ussuri class (also called Modified Sungari class) torpedo boats.