1. ARCHER CLASS SUBMARINES FOR REPUBLIC OF SINGAPORE NAVY
(RSN)
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. 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. 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. 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. 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.