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.