Torped 613 (TP613) is a heavyweight

torpedo A modern torpedo is an underwater ranged weapon launched above or below the water surface, self-propelled towards a target, with an explosive warhead designed to detonate either on contact with or in proximity to the target. Historically, such ...

still in use by the

Swedish Navy The Swedish Navy () is the maritime service branch of the Swedish Armed Forces. It is composed of surface and submarine naval units – the Fleet (), formally sometimes referred to as the Royal Navy () – as well as marine units, the Amph ...

Description

Torped 613 is wire-guided and has a dual passive and active

sonar Sonar (sound navigation and ranging or sonic navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances ( ranging), communicate with or detect objects o ...

seeker head that sends back information through the guidance wire. The torpedo was developed in the 1970s as a cooperation project between Denmark, Norway and Sweden. Testing was performed during the period spanning from 1981 to 1983. The TP613 was developed during the late 1970s and early 1980s through a collaboration between the navies in Denmark, Norway and Sweden. Production began in 1983, with first deliveries following in 1984. The weapon incorporates terminal homing and two-way wire guidance. Numerous units of TP612 were upgraded into TP613 after its introduction. Like the older Swedish Torped 61 introduced in 1968, it is driven by a bipropellant piston engine using

high-test peroxide High-test peroxide (HTP) is a highly concentrated (85 to 98%) solution of hydrogen peroxide, with the remainder consisting predominantly of water. In contact with a catalyst, it decomposes into a high-temperature mixture of steam and oxygen, with n ...

and

alcohol Alcohol may refer to: Common uses * Alcohol (chemistry), a class of compounds * Ethanol, one of several alcohols, commonly known as alcohol in everyday life ** Alcohol (drug), intoxicant found in alcoholic beverages ** Alcoholic beverage, an alco ...

, which gives long range and a minimum exhaust consisting of water vapor and carbon dioxide. Consequently, the weapon is wakeless. The torpedo is planned to be replaced by the more modern Torped 62. Short history of the TP61-series torpedoes: * TP61, ca 1970 (developed from several previous HTP-propulsioned torpedoes starting in 1955): Straight-running anti-surface torpedo for use with submarines and surface vessels. * TP611: Wire-guided version of the TP61. * TP612: Further development of the TP611 with "swim-out" launch from submarine tubes and improved noise-profile. * TP618, ca 1980: Export version of the TP612 (increased speed and less noise-reduction). * TP613, ca 1982: Development of the TP612 with passive-hydrophone target-seeker and pistol. Two-way data communications, and engine with two speeds which could be changed during the run. * TP617, ca 1982: Export version of the TP613, identical, with some degraded parameters in software for hydrophone-control and pistol giving it a slightly reduced performance.

Operators

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References

* {{refend Torpedoes of Sweden Military equipment introduced in the 1980s