Photos: White European Excellence: Swedish Navy Submarines Have A Unique Secret Weapon

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Thanks to trials with the U.S. Navy, Sweden’s submarines are famous for being stealthy. This is largely due to their Air-Independent Power (AIP), which allows them to stay submerged for much longer. It is not unique, however, as other countries now operate AIP submarines.

But Swedish Navy submarines have another capability that is unique. As well as regular torpedoes, they carry special lightweight ones. And this is where it gets secretive: they can launch two at the same time from a single tube.

Diagram of Gotland Class Submarine firing 8 torpedoes

The Gotland Class submarine has two torpedo tubes dedicated to lightweight torpedoes. Each tube can … [+]

H I SUTTON (INSERT SWEDISH ARMED FORCES)

That Swedish submarines use lightweight torpedoes is well documented. The double-tap capability is not. It is known about in some corners of the defense community, but like many topics in underwater warfare it is talked about in hushed tones. Slowly word of this capability has crept out, particularly in Sweden, but it is still virtually unknown. And some details of the capability are still secret.

Today In: Aerospace & Defense

The weapons used are smaller than regular torpedoes but larger than most other ‘lightweight’ ones. They are optimized to kill enemy submarines, although the latest models can also be used against small warships and even enemy torpedoes.

Unusually they are wire-guided, a feature which is normally only found on larger torpedoes. This allows the submarine to guide them all the way to the target. If the wire breaks, or is cut, then the torpedo goes into fire-and-forget mode using its own sonar. Wire-guidance has been found to be more reliable than fire-and-forget weapons in the confined and crowded Baltic. The torpedoes can be guided around an island to hit a target on the other side.

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Two of these smaller torpedoes can be loaded into a single torpedo tube, one behind the other. One or both can then be launched. So the effective number of torpedo tubes is doubled. In practice Swedish submarines are equipped with a mix of 21” (533mm) torpedo tubes for ‘full size’ heavyweight torpedoes and 15.75” (400mm) tubes for the special lightweight torpedoes.

This mixed load-out allows the current Gotland Class submarines to shoot up to 8 torpedoes at once despite only having 6 torpedo tubes. Four would be heavyweight torpedoes, each in its own tube, and four would be lightweight ones in double-loaded tubes. The earlier Näcken Class, which had 8 torpedo tubes, could launch 10 torpedoes at a time (6 heavyweight, 4 lightweight).

Gotland Class submarine

Official photograph of a Gotland Class submarine. It is armed with six torpedo tubes but can launch … [+]

SWEDISH ARMED FORCES (JONAS HELMERSSON, VIKTOR PERSSON, RICKARD TÖRNHJELM, JIMMIE ADAMSSON, JOAKIM NORDSTRAND)

The service history of Sweden’s lightweight torpedoes started in 1963 with the introduction of ‘Torped-41’. Today Swedish submarines carry the 4th generation Torped-45 which entered service in the mid-1990s. The next-generation Torped-47 is expected to enter service in 2022. It will arm the current A-19 Gotland class and future A-26 Blekinge Class.

Although Sweden is alone in deploying these torpedoes on submarines, other countries are looking at similar ones. The U.S. Navy drafted the Common Very Lightweight Torpedo (CVLWT) concept over 10 years ago. That weapon is appears to have morphed into the VLWT (Very Lightweight Torpedo) recently unveiled by Northrop Grumman NOC. Although that has been proposed for submarines at some point in the future, Sweden may have a unique capability for some years to come.

Source: https://www.forbes.com/sites/hisutton/2020/05/24/swedish-navy-submarines-have-a-unique-secret-weapon/#2190e11467c0



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