1. 1. ARCHER CLASS SUBMARINES FOR REPUBLIC OF SINGAPORE NAVY (RSN)
2. 2. Introduction The Archer Class is an upgrade of Vstergtland Class diesel-electric submarines which were originally developed for the Swedish Navy. The modernised submarines are in service with the Republic of Singapore Navy (RSN). The two Vstergtland Class submarines, HMS Hlsingland and HMS Vstergtland, were commissioned into the Swedish Navy during 1987- 1988. In November 2005, the Singapore Ministry of Defence (MINDEF) placed a contract with Kockums for the supply of two Archer Class (Ex- Vstergtland Class) submarines under the Northern Lights programme. The Archer Class submarines serve the 171 Squadron of the RSN
3. 3. Upgrade Program The submarines were fitted with a new hull section integrating an air independent propulsion (AIP) system. The AIP system provides longer submerged endurance and quieter operations. The stealth characteristics were optimised during the upgrade. The subs were also provided with an advanced sonar system, torpedo system and a new climate control system for operations in Singapore waters.
4. 4. Design The Archer Class incorporates a single-hull design. The hull integrates a fully equipped eight metre-long Stirling AIP section. The submarines also feature two pressure-tight compartments for increased safety and survivability of the crew. The stealth capabilities were refined for avoiding detection by hostile forces. The submarine has a length of 60.5m, beam of 6.1m and a height of 11.8m. The draught is 5.6m. Archer has a submerged displacement of 1,500t. It can accommodate 28 crew members.
5. 5. Propulsion The Archer Class submarines are powered by diesel-electric and air independent propulsion system. The propulsion plant integrates two Hedemora diesel-electric engines and two Kockums v4-275R Sterling AIP units.
6. 6. In Service The first submarine in class, RSS Archer, was launched in June 2009 at Kockums Shipyard in Karlskrona. The submarine arrived at Singapore in August 2011. It was commissioned into the RSN in December 2011. The RSS Swordsman was launched in October 2010. The submarine returned to Changi Naval Base in December 2012. The RSS Swordsman is expected to enter service in mid 2013.
7. 7. References http://www.naval- technology.com/projects/arc her-class-submarines- singapore-navy/
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