the "syöksy"-class motor torpedo boats () was a series of four british thornycroft type motor torpedo boats of the finnish navy. the vessels were constructed in 1928 by the john thornycroft & co. shipyard in woolton, uk. the vessels saw service in world war ii. the thornycroft type released its torpedoes by dropping them from rails in the aft. the ship then had to steer away from the torpedoes path, a manoeuvre that could be quite tricky in the close waters of the gulf of finland.