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Chinese scientists close in on laser propulsion for superfast, silent submarines (www.scmp.com)

submitted 6 months ago by yogthos@lemmygrad.ml to c/technology@lemmy.ml

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[–] 1984@lemmy.today 7 points 6 months ago* (last edited 6 months ago) (1 children)

Theoretically, the development could allow a submarine to travel faster than the speed of sound without producing the mechanical noise vibration that usually gives away its location, according to the researchers.

LOL, imagine a submarine traveling at Mach 1 under water... :)

That's 1224 km per hour ( or 761 miles per hour)

[–] Fermion@mander.xyz 11 points 6 months ago* (last edited 6 months ago) (2 children)

The speed of sound in seawater is around 1500m/s or 5400 km/hr. Something tells me they won't actually be going supersonic.

The article shouldn't be referencing the speed of sound without specifying the medium for the sound waves and conditions such as temperature for water or temperature and pressure for air.

Also, the supercavitation would be incredibly noisy underwater, and at those speeds the vessel itself would produce a very loud pressure wave that would be easy to detect. So its advantage wouldn’t be in avoiding detection, it would be in moving fast enough that detection doesn't matter because no torpedo could intercept them.

[–] 1984@lemmy.today 3 points 6 months ago (1 children)

Thanks, didn't think about that.

Maybe they can make torpedoes using the same tech....

[–] heysoundude@derpzilla.net 2 points 6 months ago

Torpedoes rely on sonar for targeting, so as long as they travel below the speed of sound in seawater…

[–] geography082@lemm.ee 3 points 6 months ago (1 children)

“fear china” , “world destruction” , ww3 fantasy click bait

[–] Fermion@mander.xyz 2 points 6 months ago

South China Morning Post publishing propaganda? Say it's not so.