Two new 50 m Patrol Boats for Vietnam Navy
Acceptance trials were successfully completed last week for delivery of two further patrol boats for the Vietnamese Navy. This now brings a total of four Svetlyak Class (Project 10412) patrol boats supplied to Vietnam, built by the Almaz Shipyard, in St Petersburg, Russia . A further two are under construction at the Vostochnaya Verf in Vladivostok and are expected to be delivered in 2012.
Caption: Almaz Svetlyak Class, Project 10412 patrol boat is designed for patrol service in coastal areas.
image credit: Almaz
The 375 t displacement vessels have a LOA of 162 ft (49.5 m), beam of 30 ft (9.2 m) and draft of 8.2 ft (2.5 m). The original Svetlyak Class (10410) was designed in the 1980s, has been updated and is available with a more offensive weapon suite including missiles and torpedoes as the 10411 version.
The propulsion arrangement comprises three Zvezda M520 supercharged diesel engines, each with rated output of 4,828 hp (3,600 kW) at 1,900 rpm. These unique engines are of a radial (star) configuration with 56 cylinders arranged in seven banks of eight cylinders and consequently offer a very high power density. The total power of 14,484 hp (10,800 kW) gives a top speed of 30 kn: at a cruising speed of 13 kn the range is 2,200 nm.
Caption: Zvezda's prodigious 56 cylinder radial diesel engine
as the M520 is rated at 4,828 hp (3,600 kW) at 1,900 rpm.
image credit: Zvezda JSC
A same class of vessel was supplied to the Slovenian Navy in 2010 but uses the different propulsion specification of three MTU 16V4000M73L diesel engines rated at 3,860 hp (2,880 kW) giving a top speed of 27 kn: and a range of 2,200 nm at a cruising speed of 13 kn.
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