Coastal vessel, experimental torpedo boat similar to the PT-20.
In 1941, the Soviet Navy issued specifications for a long-range seagoing torpedo boat, with the task of designing the vessel given to the NKVD Shipyard No.340 in Zelenodolsk. The project was led by the imprisoned designer Pavel Goynkis (who would later design the Project 183 torpedo boat) who based the design on the earlier SM-3 torpedo boat (a predecessor to the D-3), and in February of 1942 the design was submitted for approval. The ship was named the STK DD, which stood for “Stal’noy Torpedniy Kater Dalnego Deystviya” (Long Range Steel Torpedo Boat), and began construction at the shipyard. It’s steel construction was somewhat unusual as the torpedo boats already in production were all made of wood or duralumin, but the No.340 shipyard only had experience constructing steel vessels. It featured new technologies that later Soviet torpedo boats would use, namely the use of the M-50 diesel engines, which were more reliable and powerful than the aircraft petrol engines in-use, and torpedo tubes, which were more reliable than the drop collars and chutes used in older torpedo boats. The STK DD was completed in December of 1942, and spent a few months in tests on the Caspian Sea, where unfortunately it was unable to reach its designed speed of 40 knots, possibly due to being too heavy because of the steel construction. The ship was then transferred to Poti and commissioned into the Black Sea Fleet, but due to the disappointing test performance was not used in combat, and its design would never reach production. In 1946 the boat would be discarded.
3x1 12.7mm DShK
4x1 450mm Torpedo Tubes
Depth Charge rail (12 DCs)
Propulsion: 3 M-50 and 1 auxiliary V-2 diesel engines, 3000 + 450 hp, driving 3 shafts
Speed: 34 knots (63 km/h)
Range: 1000nmi (at 10 knots)
Budzbon , P. Radziemski, J. Twardowski, M. (2022) Warships of the Soviet Fleets 1939–1945 (Kindle, pp. 340). Pen and Sword.