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IDEF 2021: STM details small submarine design for foreign customer

23rd August 2021 - 13:17 GMT | by Cem Devrim Yaylalı in Istanbul

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The STM500 project is being developed at the behest of an unidentified foreign customer. (Image: STM)

The 42m STM500 will be armed with four torpedo tubes and includes SOF infil/exfil among its intended mission sets.

Turkish defence engineering company STM unveiled the conceptual design of small submarine prior to the IDEF 2021 exhibition.

The STM500 is a shallow water diesel-electric attack boat. The platform has a surfaced displacement of 485t, and when submerged displaces 540t. It is 42m long, with the diameter of the pressure hull measuring 4.2m. The submarine is expected to dive deeper than 250m. For power generation there will be two diesel engines plus lithium-ion batteries.

Calculated maximum speed is more than 18kt, with a 5kt cruise. STM500 has a range of 3,500NMi on diesel and 75NMi on batteries.

For a small submarine the

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