The AK-230 turrets were unmanned, each armed with two 30 mm guns capable of firing 2,000 rpm (400 practical) with a 2,500 m practical range. Even if placed in the aft, this radar had a good field of view all around. An MR-104 Rys (NATO: "Drum Tilt") fire-control radar was placed in a high platform, and controlled the whole horizon, despite the superstructures that were quite wide but low. The problem related to the weak anti-aircraft weaponry of the earlier Project 183R was partially solved with the use of two AK-230 turrets, in the fore and aft deck. There was a control compartment between the two engine rooms. 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. The powerful engines allowed a maximum speed of about 40 knots together with reasonable endurance and reliability. The hull was quite wide, but the Project 205 boats could still achieve high speeds as they had three Zvezda M503 radial diesel engines capable of a combined 12,000 hp (15,000 hp on Project 205U onward) driving three shafts. The edges of the deck were rounded and smooth to ease washing off radioactive contamination in case of nuclear war. The hull was made of steel, with a low and wide superstructure made of lighter AMG alloys, continuous deck, and a high free-board. They were still meant to be 'minimal' ships for the planned tasks. ![]() ![]() The Project 205 boats are bigger than the pioneering Project 183R (NATO: Komar class) boats, with a mass four times greater, and nearly double the crew. In order to remedy all these shortcomings, it was felt that bigger boats were needed to mount the necessary equipment and to provide more space for a larger crew. The sensors were not effective enough to use the maximum range of the missiles, and the crew of 17 was not large enough to employ all the systems efficiently. The Komars' offensive weapons were a pair of P-15 Termit (NATO: SS-N-2 "Styx") missiles, and there was insufficient capacity to hold the more modern longer-ranged P-15Ms. Among their other weak points were the wooden hull, the radar set lacking a fire control unit, and an inadequate defensive armament consisting of two manually operated 25 mm guns with only a simple optical sight in a single turret. While the earlier Komar class were cheap and efficient boats (and the first to sink a warship with guided missiles, destroying the Israeli Navy's Eilat), their endurance, sea keeping, and habitability were modest at best, and the missile box was vulnerable to damage from waves. The boats were designated as "large missile cutters" in the Soviet Navy. Osa means wasp in Russian, but it is not an official name. The Osa class is probably the most numerous class of missile boats ever built, with over 400 vessels constructed between 19 for both the Soviet Navy and for export to allied countries. Until 1962 this was classified as a large torpedo boat. 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. 4 × P-15 Termit (SS-N-2 Styx) anti-ship missiles.MR-104 Rys (Drum Tilt) fire-control radar for AK-230.Klyon fire-control system for P-15 Termit.
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