The Durjoy class is a class of large patrol craft of the Bangladesh Navy. A total of eight ships of this class are planned and four are serving the Bangladesh Navy as of 2017.
History
The Durjoy class is a class of large patrol crafts of the Bangladesh Navy, designed to meet the longer patrolling and surveillance needs in the vast EEZ of Bangladesh in the Bay of Bengal as well as to perform limited offensive roles. The ships of this class are of two variants, anti-surface warfare variant and anti-submarine warfare variant. The primary characteristics of the two variants are same but they differ in armaments and sensor suite. Initially, a contract was signed in 2009 for two ships to be built at Wuchang Shipyard in China. The ships were of anti-surface warfare variant. The first, , was launched on 26 August 2012, while the second, , was launched on 27 September 2012. Both ships arrived in Bangladesh in February 2013. The ships were commissioned on 29 August 2013. On 30 June 2014 the Bangladesh Navy signed a contract for the next two Durjoy-class vessels with Khulna Shipyard. These ships were constructed in Bangladesh under ToT from China. Keel laying of the ships was done on 6 September 2015. The first two vessels made at Khulna Shipyard were commissioned on 8 November 2017. These ships were of Anti-submarine warfare variant.
Design
These ships are long, wide and have a draught with a displacement of 648 tonnes. The ships have a bulbous bow shape, which suggests they are designed to sustain heavy sea states. The ships have speed and range to support long missions. The large patrol crafts are powered by SEMT Pielstick 12PA6 diesel engines driving three screws for a top speed of for anti-surface warfare variant and for anti-submarine warfare variant. The range of the ships is for anti-surface warfare version and for anti-submarine warfare version with an endurance of 15 days. The anti-surface warfare ships can carry 60 personnel while anti-submarine warfare ships can carry 70 personnel. They can carry one Rigid-hulled inflatable boat and has the support system to launch it.
Electronics
;Anti-surface variant The primary sensor of the ships of this variant is a Type 360 Surface Search, E/F band radar. They carry a Russian MR-123-02/76 Fire Control Radar for 76.2mm H/PJ-26 gun and two I-band Type 347G Radar for 20mm cannon. For fire control of C-704 missiles, these ships use Type 352 I-band radar which can be used as surface search radar also. They use ESS-3 bow mounted sonar with an effective range of about for underwater detection. A JRCSS combat management system with at least three multifunction consoles is also fitted in the ships. ;Anti-submarine variant Primary sensor of the ships of anti-submarine warfare variant is a SR47AG Surface and Air Search radar. They carry a Chinese TR47C radar which is used as tracking radar. They carry Japanese JMA 3336 radar for navigation purpose. To help the navigational radar, the Vision Master chart radar is used. The ships have a ESS-2B bow mounted sonar with an effective range of about for underwater detection.
Armament
;Anti-surface variant The large patrol crafts of this variant are armed with a single H/PJ-26 naval gun and four C-704 surface to surface missiles mounted aft. Besides, these ships have two Oerlikon 20 mm cannon mounted amidships which can be used for anti-aircraft role. For their anti-submarine warfare role, they have two forward-mounted 6-tube EDS-25A anti-submarine warfare rocket launchers. ;Anti-submarine variant The ships of this variant uses a Chinese origin single NG 16-1 naval gun as primary weapons. Besides, they have one CS/AN2 30mm single-barrel naval gun mounted amidships used as secondary weapon. For anti-submarine warfare role, these ships are armed with two triple torpedo tubes for ET-52C torpedoes.
