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Project 664-class torpedo boat
The Project 664 (NATO reporting name ''Wisla'') class were Polish torpedo boats, designed in Poland in the 1970s. They were one of the few vessels of this size, powered by a gas turbine, and could achieve a great speed.
== Development ==
In the late 1950s the Polish Navy decided to develop fast torpedo boats of own design, to supplement Soviet-origin project 183 (P-6) class torpedo boats. It was decided to use a gas turbine for propulsion and arm them with four torpedo tubes. Due to lack of previous experience in designing such craft, development was very long. In order to test the technology, a single experimental project 663D torpedo boat was built, ORP ''Błyskawiczny''. Her building started in 1961 and she entered service in 1965. Trials revealed some faults, and further development work was carried out. The result were the boats of the final project 664. They shared a similar silhouette, hull shape and a propulsion fit of 4 diesel and a TM-1 gas turbine engine in a CODAG arrangement. The gas turbine itself was an adaptation of a licence-built Klimov VK-1 aircraft jet engine. The gas turbine being used at speeds above 12 knots.
From 1968, eight boats were built in Stocznia Północna (Northern Shipyard) in Gdańsk. They were given numbers from KTD-452 to KTD-459 (an abbreviation of ''kuter torpedowy duży'' - "torpedo boat, large") and names.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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