OVERVIEW: The Tp 611 is a heavyweight, wire-guided torpedo introduced by Sweden in 1966. It served in both anti-ship and anti-submarine roles aboard Swedish submarines and surface vessels.

DETAILS: “Tp” stands for Torped. The Tp 611 was the first wire-guided variant of the HTP-powered Tp 61 heavyweight series, developed by FFV (later Saab) and entering service in 1966–1968 following the original straight-running Tp 61. It has a 533 mm diameter, uses high-test peroxide (HTP) and ethanol propulsion enabling speeds up to 60 kn, and carries a 300 kg warhead with proximity and impact fuzes. Wire-guidance allowed mid-course path corrections, and Tp 611 could engage both surface vessels and submerged submarines . The system formed the foundation for later variants Tp 612 and Tp 613, which added swim-out launch and dual-speed/two-way communications capabilities.

TYPE: Heavyweight Wire-Guided Anti-Ship and Anti-Submarine Torpedo

FUNCTION: Launched from 533 mm submarine or shipboard tubes, the Tp 611 travels under wire guidance during the initial and mid-course phase, allowing operator-steered adjustments. It then switches to terminal homing via onboard acoustic sensors or gyroscopic course-keeping to strike maritime or submerged targets at high speed.

NOTE:
IOC: 1966–1968 (Tp 611)
Manufacturer: Sweden (Förenade Fabriksverken / Saab Bofors Underwater Systems)
Operators: Sweden
Platforms: Swedish submarines and HSwMS Halland-class destroyers
SOURCE:
Jane’s Naval Weapon Systems “Torpedoes, Sweden Tp 61/Tp 62 series” – https://www.torp.esrc.unimelb.edu.au/bib/P00001340.htm; Naval-Encyclopedia “Halland class destroyer” – https://naval-encyclopedia.com/cold-war/sweden/halland-class-destroyer.php