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Missile Boat R-25
Project 205 / Osa class
 

The Osa is a high speed missile boat of Soviet origin. It was developed in the early 1960's as a more capable alternative to the Komar class missile boat. The Osa is the world's most numerous missile boat. The official Soviet designation for this class is Project 205 Tsunami. The name Osa, which Russian for wasp, is the NATO designation. The improved Project 205U is known as Osa II.

The Osa class is a major improvement over the Komar missile boats. The Osa class is four times larger, is based on a steel hull, features 4 instead of 2 missiles, has a much improved air and self defense capability and better sea going performance. The improved Osa II features better engines and can fire a newer version of the P-15 anti-ship missiles. The main armament of the Osa are the four P-15 (SS-N-2 Styx) anti-ship missiles. Air defense is provided by two AK-230 turrets with two 30mm autocannon. One turret is fitted forward and the other aft. The AK-230 turrets were unmanned, each armed with two 30 mm guns capable of firing 2000 rpm (400 practical) with a 2500 m practical range. For an increased air defense capability the manually aimed quad launcher for the infra red guided Strela (SA-N-5) surface to air missiles was added to some vessels, mostly the Osa II.

To keep the design simple the Osa has three diesel engines each connected to its own shaft. The power to weight ratio is high and results in a maximum speed of 39 knots. The Osa II has more powerful engines and a slightly high maximum speed. Although the sea going capability is better than the Komar the Osa is not a true ocean going ship and is mostly used in coastal waters.

The Osa was widely used by Soviet and Eastern European forces during the Cold War. It was also widely exported, mainly to Asia and the Middle East (over 400 were made in USSR, and another 120 in China). These missile boats saw action during the War of Attrition, Yom Kippur War, and Indo-Pakistani War of 1971, also used in the Iran-Iraq War.

Missile boat R-25 was built at the Rybinsk Shipyard (yard No.463), commissioned 1967.

Was listed as missile boat of the 41st Brigade of Missile Boats.

In 1974, the missile boat R-25 was transferred to the Navy of South Yemen.

Specifications
Displacement (tons):
Standard:171,5
Full load:209
Dimensions (m):
Length:38,6
Beam:7,6
Draft:1,73
Speed (knots):38,5
Range:1800 nmi (14 knots), 800 nmi (30 knots)
Autonomy (days):5
Propulsion:3x4000 hp M-503G diesels, 3 fixed pitch propellers, 1x75 kW DG-75-1 diesel generator, 1x43 kW DG-43-14/1500P diesel generator
Armament:4x1 KT-97 anti-ship missiles launchers (4 P-15 (4K40), P-15T missiles)
2x2 30 mm AK-230 (2000 rounds) MR-104 Rys fire control system
Electronics: MR-101 Rangout radar, Nikhrom-RRM IFF, Nickel IFF, ARP-58SV radio direction finder
Complement:28 (4 officers)

 

 
       
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