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I remembered reading about this Stirling powered sub sometime back: http://www.kockums.se/Submarines/aipstirling.html

Stirlings don't have to be used for low power systems, it's just that they tend to be used in a "energy from the environment" mode as a type of free energy.

http://www.kockums.se/Submarines/gotland.html

http://www.kockums.se/Submarines/aipstirling.html

And the australian Collins-type submarines were built by Kockums Marine Systems in Sweden; those Stirling AIP engines are quiet as well as being able to allow the submarine to stay submerged several weeks. Interesting that Sweden possess such a prominent position in the submarine market (scroll down towards the end).

And the australian Collins-type submarines were built by Kockums Marine Systems in Sweden; those Stirling AIP engines are quiet as well as being able to allow the submarine to stay submerged several weeks. Interesting that Sweden possess such a prominent position in the submarine market (scroll down towards the end).

The Sea Shadow program was begun in the mid-1980s...

In 1986 the Swedish Defence Material Administration (FMV) initiated the development of a stealth test platform, HMS Smyge.

... can be found here

Lots of cool pictures and info on the Visby at the following sites:

http://www.kockums.se/News/photostock/photosurface .html
http://www.kockums.se/surfacevessels/visby.html
http://www.naval-technology.com/projects/visby/
http://www.memagazine.org/backissues/jan01/feature s/stealth/stealth.html

3D! Da corn is popping in your face inna... [throws popcorn in his own face] 3-D! -The Swedish Chef

Lots of cool pictures and info on the Visby at the following sites:

http://www.kockums.se/News/photostock/photosurface .html
http://www.kockums.se/surfacevessels/visby.html
http://www.naval-technology.com/projects/visby/
http://www.memagazine.org/backissues/jan01/feature s/stealth/stealth.html

3D! Da corn is popping in your face inna... [throws popcorn in his own face] 3-D! -The Swedish Chef

This is a link to kockums, the builder of the ship. Visby

http://www.kockums.se/SurfaceVessels/visby.html

The boat is named Visby and pics of it can be found here and here /Björn

The boat is named Visby and pics of it can be found here and here /Björn

The swedish Visby class corvette is another neat piece of work, though one has to argue that taxpayers money could be better spent.

Check here for more info (in norwegian only, sorry) on the Skjold-class MTBs. I'm not sure when they will be ready though. The boats are propelled by water jets which means they can turn really really fast. The swedish navy is also getting stealthy boats, and they got water jets too.

This sounds like the Swedish Visby corvette, built by Kockums. They also make subs, most notably Australias Collins class diesel subs. Regards / ushac

This sounds like the Swedish Visby corvette, built by Kockums. They also make subs, most notably Australias Collins class diesel subs. Regards / ushac

This sounds like the Swedish Visby corvette, built by Kockums. They also make subs, most notably Australias Collins class diesel subs. Regards / ushac

We've got Air Independent Propulsion on some of our subs in the Swedish Navy... (well, as some of you would point out, it's only independent for a period of time.) The trick is to use liquid O2 and a diesel burner to drive a Stirling engine, and use enough pressure during combustion to be able to feed the exhaust out into the water. Since it's mostly CO2 it dissolves quickly. For the burner to get "air-like" oxidizer the O2 is mixed with a small back feed of reused exhaust. There is a more thorough explanation on Kockums website.

This is not as clean as the drone in the original article, but OTOH, the collected exhaust in the drone has to be disposed of somewhere - it's not gonna disappear just because it's not in the atmosphere.