Finnish 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 (S1-S5) 52.35 m (S6)
Beam:	5.6 m (S1-S5) 5.25 m (S6)
Draught:	1.7 m (S1-S5) 1.47 m (S6)
Propulsion:	2x Steam engines, four Yarrow boilers; 3,800 hp
Speed:	27 knots (S1-S5) 26 knots (S6)
Range:	550 nm (at 15 knots) (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
Notes:	Ships in class include: S1, S2, S3, S4, S5, S6

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-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.