with 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 of the earlier Project 183R was partially solved with the use of two AK-230 turrets, in the fore and aft deck. 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. Even if placed in the aft, this radar had a good field of view all around. 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. 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. Truly effective anti-surface gun weaponry was not available until the introduction of the Project 12341.1 Molniya (NATO: "Tarantul") class corvettes, with 76 mm guns. The offensive armament consisted of four P-15 Termit (NATO: SS-N-2 "Styx") missiles, each protected from bad weather conditions inside an enclosing box-shaped launcher. This doubled the available weapons compared to the Project 183R, giving greater endurance. The missiles were controlled by a MR-331 Rangout (NATO: "Top Bow") radar and a Nikhrom-RRM (NATO: "Square Tie") ESM/IFF that even allowed targeting over the horizon, if the target's radar was turned on. With all these improvements, these ships were considerably more effective. They had one of the first, if not the first close-in weapon systems (CIWS). The survivability rating was improved to 50%, and the required volley of 12 missiles could be launched by only three ships. Sinking a destroyer was therefore regarded as 'assured' using only six ships (two squadrons of three vessels), making the Project 205 vessels easier to coordinate and even cheaper than would be the required number of Project 183R boats to achieve the same effectiveness. As a result of these improvements, Project 205 boats were without equal in the late 1950/early 1960s. Over 400 were made in USSR, and another 120 in China. Some of the improved Project 205U (Osa II) were equipped with the 9K32 Strela-2 (NATO: SA-N-5 "Grail") surface-to-air missiles in MTU-4