P 4-class torpedo boat

P 4 class torpedo boat
	Decommissioned P 4-class torpedo boat of the Bangladesh Navy. Preserved at the Bangladesh Military Museum.
Class overview
Name	Project 123-bis "Komsomolets" torpedo boat; Project 123-K "Komsomolets" torpedo boat;
Builders	Shipyard No.609, Tyumen; Shipyard No.831, Feodosia;
Operators	Soviet Navy; Albanian Naval Force; Bangladesh Navy; Bulgarian Navy; Benin Navy; People's Liberation Army Navy; Cuban Revolutionary Navy; Cyprus Navy; Egyptian Navy; Iraqi Navy; Israeli Navy; Korean People's Navy; Romanian Naval Forces; Syrian Navy; Somali Navy; Tanzania Naval Command; Vietnam People's Navy; Yemeni Navy; Zairian Navy;
Preceded by	D3 class
Succeeded by	P-6 class
Built	1944–1955
Completed	~336
General characteristics
Type	Motor torpedo boat
Displacement	22 tonnes (22 long tons)
Length	18.70 m (61 ft 4 in) (B-123) 19.26 m (63 ft 2 in) (K-123)
Beam	3.40 m (11 ft 2 in)
Draft	1.0 m (3 ft 3 in)
Propulsion	2 × Soviet M-50 diesel engines, 2,400 hp (1,790 kW), 2 shafts
Speed	46–55 knots (85–102 km/h; 53–63 mph)
Range	500 nmi (930 km; 580 mi)
Complement	7-12
Sensors &; processing systems	1 × Soviet I band Zarnitsa (Skin Head) navigational radar (K-123 only)
Armament	2 × 450 mm (17.7 in) torpedoes; 2 × 2 12.7 mm (0.50 in) DShK heavy machine guns or 1 x 2 14.5 mm (0.57 in) KPV heavy machine guns ; 6 × BM-1 depth charges ;

The P 4-class torpedo boat, Soviet designations Project 123-bis and Project 123-K, commonly called the Komsomolets class (Russian: Комсомолец, a male member of the Komsomol), were Soviet aluminum-hulled torpedo boats. They were armed with twin heavy machine guns and two 450 mm (17.7 in) torpedoes. A large number of them were exported to allied states such as North Vietnam and China. They saw service in a variety of armed conflicts including World War II, the First Taiwan Strait Crisis, the Vietnam War and the Turkish Invasion of Cyprus.

The P 4 torpedo boats consisted of two primary types; the Project 123-bis (B-123) type with 12.7-millimetre (0.50 in) machine guns, and the Project 123-K (K-123) type with added radar and 14.5-millimetre (0.57 in) machine guns.