OVERVIEW: The Osa II-class PCFG (Pr. 205ER) is a  three shaft, diesel-powered missile armed fast attack craft.

DETAILS: The Osa class was designed to remedy the earlier Komar class' shortcomings in range, sea keeping and armament. The Osa II improves on the Osa I by incorporating the more advanced SS-N-2b or SS-N-2c missile and, in some units, the SA-N-5 short-range SAM missile.  The Project 205ER are the export model of the Osa II, differing mainly from the Soviet model by the lack of a radar warning receiver.  The Osa class is reported to have mediocre sea keeping abilities and temperamental engines.

In Soviet doctrine, missile craft such as the Osa would be used in sweep, raids, free hunt/roving patrols against merchants and ambush operations against combatants, especially in maritime choke points. Missile boats were intended to operate in Soviet coastal waters or nearby enemy controlled waters.  Tactically, they usually operated in pairs and tried to approach maritime targets from within 15 degrees on either side of the target's bow to rapidly close the target, before slowing to approximately 15 knots to fire its missiles.  Typically, missiles would be fired in salvos of two missiles.  Within a minute, a second salvo of two missiles may be fired.
  
The Osa can launch its SSM missiles in up to sea state 4 (2 meter) waves. 
  

Specifications:

		Displacement: 192 tons standard; 235 tons full load
       		Speed: 42 knts 
       		Range:  1800 nm @14 knts; 800 nm @ 30 knts 
       		Complement: 29  
       		 
       	

NOTES: IOC 1978. Ten units delivered from September 1978-May 1984. Six units in inventory in 1987.

SOURCES: Jane's Fighting Ships: 1987-88. Ihs Global, 1987, pg. 249; "Missile BoatsProject 205." Accessed December 30, 2019. http://russianships.info/eng/warfareboats/project_205.htm.; Vego, Milan "Soviet Naval Tactics", Annaolis, MD: Naval Institute Press, 1992, pg. 242-49; Prezelin, Bernard (ed) Naval Institute Guide to Combat Fleets of the World, 1990-91,  Annapolis, MD: Naval Institute Press, 1990, pg. 622.
