Project 1256

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Project 1256 p1
Ship data
country Soviet UnionSoviet Union (naval war flag) Soviet Union
Ship type Anti-mine vehicle
Shipyard Nevsky shipyard in Pontonny
Construction period 1974 to 1976
Units built 2
period of service 1976 to 1993
Ship dimensions and crew
length
47.9 m ( Lüa )
width 8.7 m
Draft Max. 2.36 m
displacement 473 t
 
crew 20th
Machine system
machine 2 × M-504A-3 marine diesel
1 × M-8NL gas turbine
Machine
performance 		2 × 4750 PS (3493) kW
1 × 20,000 PS (14,709) kW
Top
speed 		38 kn (70 km / h)
propeller 3
Armament
Sensors
  • Navigation radar Don

Project 1256 Code name: Topaz ( Russian Топаз , NATO designation: "Andryusha class") was a class of fast mine clearance ships of the Soviet Navy . The two ships of the class were developed by the Soviet Union as test vehicles for a new type of mine clearing ship for the coastal apron, but their testing failed, so the project was not continued.

description

Project 1256 was developed to detonate sea ​​mines lying on the ocean floor in the shallow waters off the coast by artificially increased noise and magnetic field emissions and then to evade the effects of the detonation by a combination of high speed and a special construction method.

A powerful machine system was initially decisive for this idea. In addition to two powerful M-504A-3 marine diesel engines , a 20,000 PS M-8NL gas turbine was installed so that Project 1256 could be accelerated to up to 40 knots for a fast sprint. For generating an artificial magnetic field that the sensors in the magneto an underground mine could simulate a large target vessel, two large steel strap with one were cylindrical coil (solenoid) from the stern out coming over the stern on the bridge structure over and onto the foredeck. With specially shaped propellers and other mechanisms, the emission of noises was artificially increased so that mines that responded with microphones to noise from ships were to be fooled within a larger radius.

In order to keep the risk to the crew low, the ships in the target area should also be remote-controlled. The “Stroy” radio remote control system was developed for this purpose, with which each ship was to be controlled and the formation of several ships to be maintained. However, this system was not up to the task, so that the project was finally abandoned completely.

The armament consisted of a 30 mm L / 63 AK-306 anti-aircraft tower on the forecastle in front of the bridge.

Whereabouts

Two ships were built by 1974 and retired by 1993.

literature

  • Ю.В.Апальков: Корабли ВМФ СССР. Том IV - Десантные и минно-тральные корабли. Saint Petersburg, 2007, ISBN 978-5-8172-0135-2 . (Russian)

Web links

Individual evidence

  1. ↑ a b c d Ю.В.Апальков: Корабли ВМФ СССР. Том IV - Десантные и минно-тральные корабли. Saint Petersburg, 2007, ISBN 978-5-8172-0135-2 , p. 146 and following