Osa-class missile boat

	Osa I (Project 205) craft
Class overview
Name	Osa class
Builders	Vostochnaya Verf
Operators	see below
Preceded by	Komar-class missile boat
Succeeded by	Tarantul-class corvette
Subclasses	Osa I, Osa II
Built	1960–1973
In service	1960–present
Completed	400+
General characteristics
Type	Missile boat
Displacement	Osa I; 171.5 (with M-504B – 184) tons standard; 209 (with M-504B – 226) tons full load; Osa II; 192 tons standard; 235 tons full load;
Length	38.6 m (127 ft)
Beam	7.64 m (25.1 ft)
Draught	1.73 m (5.7 ft) (with M-504B – 1.84 m (6.0 ft))
Installed power	3 × 4,000 hp (3.0 MW) M-503G diesel engines (205); 3 × 5,000 hp (3.7 MW) M-504B diesel engines (205U onwards);
Propulsion	3 shafts
Speed	38.5 knots (71.3 km/h) (M-503G); 42 knots (78 km/h) (M-504B);
Range	1,800 nmi (3,300 km) at 14 knots (26 km/h),; 800 nmi (1,500 km) at 30 knots (56 km/h),; 500 nmi (930 km) at 35 knots (65 km/h);
Endurance	5 days
Complement	28 (4 officers) (Osa I); 29 (4 officers) (Osa II);
Sensors and ; processing systems	MR-331 Rangout (Square Tie) radar; Klyon fire-control system for P-15 Termit; Nickel IFF; MR-104 Rys (Drum Tilt) fire-control radar for AK-230; ARP-58SV radio direction finder;
Electronic warfare ; & decoys	Nikhrom-RRM IFF/ESM
Armament	2 × AK-230 twin 30 mm CIWS (2,000 rounds); 4 × P-15 Termit (SS-N-2 Styx) anti-ship missiles;

The Project 205 Moskit (mosquito) more commonly known by their NATO reporting name Osa, are a class of missile boats developed for the Soviet Navy in the late 1950s. Until 1962 this was classified as a large torpedo boat.

The Osa class is probably the most numerous class of missile boats ever built, with over 400 vessels constructed between 1960 and 1973 for both the Soviet Navy and for export to allied countries. Osa means wasp in Russian, but it is not an official name. The boats were designated as "large missile cutters" in the Soviet Navy.

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