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Osa I (Project 205) craft
Class overview
Name:
Osa I (Project 205)
Operators:
see below
Preceded by:
Komar class missile boat
Succeeded by:
Tarantul class corvette
Subclasses:
Osa I, Osa II
Completed:
400+
General characteristics
Type:
fast attack craft
Displacement:
172 tons standard, 210 tons full load
Length:
37.5 m
Beam:
7.64 m
Draught:
3.8 m
Propulsion:
3 M504 B2 waterjets; 12,500 hp
Speed:
38 knots
Range:
500 nm at 35 knots
Crew:
26 / 28
Armament:
2 AK-230 30 mm/651 SA-N-5 SAM (1x4) MANPAD air defence missiles (Osa II)4 SS-N-2A Styx
The Osa class is the NATO reporting name for a group of fast attack craft developed for the Soviet Navy in the early 1960s. The Soviet designations are Project 205 (?????? 205) and Project 205U (?????? 205?) Tsunami. These craft are probably the most numerous class of missile boats ever built, with over 400 vessels constructed for both the Soviets and for export to allied countries. Two main variants were built: the Osa 1 (Project 205) which had box-shaped missile containers and the Osa 2 (205U) which had cylindrical missile containers. "Osa" means "wasp" in Russian, but it is not an official name.
Contents
1 Origins
2 Project
3 Combat service
4 Ships
4.1 Osa I
4.2 Osa II
5 References
//
Origins
These missile boats were designed to be much better fighting vessels than the previous Komar (Project 183R) class. While the Komars were cheap and efficient (and the first to sink a warship, destroying the Israeli Navy's Eilat), their endurance, sea keeping and habitability were modest and the missile box was vulnerable to damage from waves. Among their weak points was the wooden hull, the radar set lacking a fire control unit, and as single defenive position consisting of two manually operated 25 mm guns, (even if quite powerful themselves) with a simple optical sight. The Komars' offensive weapons were a pair of SS-N2A/P-15 missiles, and there was not enough capacity to hold the more recent longer-ranged P-15Ms. The sensors were not effective enough to utilize the maximum range of missiles, and the crew, numbering eleven, was not large enough to employ all the systems. As a result of these well recognized shortcomings, Komars were organized in squadrons of six units, because it was expected that every NATO destroyer needed two missile hit to be sunk and this could only be assured with 12 missiles. Since 'Komar's were rated with a rather low capability to survive, it was necessary to use three squadrons for every target, to assure one was successful.
Project
Osa ships were bigger than 'Komar' class, with a mass four times greater, and thirty crew. They still were meant as 'minimal' ships for the planned tasks.
The hull was metallic (steel), with low and wide superstructure made of lighter AMG alloys, continuous deck and a high free-board. The edges of the deck were rounded and smooth to ease washing off radioactive contamination in the case of nuclear warfare. The hull was quite wide, but OSAs could still achieve high speeds as they had three diesel engines capable of 12,000 hp (15,000 hp on Osa II), on three axis (to simplify the design, paradoxically, all engines were linked to one propeller). The powerful engines allowed a maximum speed of 40 knots (with 60 hp/ton, three times that of a 'fast tank' like Leopard 1) and reasonable endurance and reliability. There were also three diesel generators. Two main engines and one generator were placed in the forward engine room, the third main engine and two generators in the aft engine room. There was a control compartment between the two engine rooms.
The problem related to the weak anti-aircraft weaponry was partially solved with the use of two AK-230 turrets, in fore and aft deck (similar to the Hegu class, a Chinese improved and longer Komar, with an additional 25 mm gun). A 'Drum Tilt' radar was placed in a high platform, and controlled the whole horizon, despite the superstructures that were quite wide but low. So, even if placed in the aft, this radar had a quite good field of view all around. The AK-230s were unmanned, quite low and small, each armed with two 30 mm guns capable of firing 2,000 rpm (400 practical) with 2,500 m practical range. Use against surface targets was possible, but as with the previous Komar ships, once all missiles were expended it was planned to escape and not fight. Effective anti-surface weaponry was not available until the introduction of the Tarantul corvettes, with 76 mm guns.
The missile armament consisted of four hangars (protected from bad weather conditions) each with one SS-N 2/P-15 missile. This doubled the available weapons, allowing more persistent actions in the sea....(and so on)
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