Isku-class motor torpedo boat

Class overview

Name	Isku
Builders	Porvoon Veneveistämö, Porvoo, Finland
Operators	Finnish Navy
Preceded by	Sisu class
Succeeded by	Syöksy class
Built	1926
In commission	1926–1942
Completed	1
Retired	1
General characteristics
Type	Motor torpedo boat
Displacement	11 tons
Length	16.6 m (54 ft 6 in)
Beam	3.4 m (11 ft 2 in)
Draught	1.1 m (3 ft 7 in)
Propulsion	2 × Rolls-Royce gasoline engines; 597 kW (801 hp)
Speed	31 knots (57 km/h; 36 mph)
Complement	1+6
Armament	2 × 450 mm torpedoes 2 × 7.62 mm machine guns 2 × depth charges

The Isku-class motor torpedo boat (English: Strike) was a Thornycroft type motor torpedo boat of the Finnish Navy. The vessel was constructed in 1926 by the Borgå varv, in Porvoo, Finland, and she saw service in World War II. Isku differed from the original Thornycraft design through its torpedo launching method (they were released from the sides of the hull, in contrast to dropping them from the aft). However, she was not a successful design and she only participated in the Winter War and during the first months of the Continuation War. She was stricken from the navy lists in 1942, due to extensive wear damage on the hull. She was moored at Suomenlinna and was scrapped after the war.