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"Navy Columbia-Class - stealthiest sub ever?" Topic

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Personal logo Editor in Chief Bill The Editor of TMP Fezian20 Jun 2018 10:11 a.m. PST

The Navy has now issued at least one-fourth of the design work and begun further advancing work on systems such as a stealthy "electric drive" propulsion system for the emerging nuclear-armed Columbia-Class ballistic missile submarines by 2021…


28mm Fanatik20 Jun 2018 11:18 a.m. PST

Interesting, but Popular Science reported this "new technological breakthrough" in stealthy sub design about a year ago:


Lion in the Stars20 Jun 2018 6:13 p.m. PST

It's certainly the design goal for the Columbia-class.

I mean, they need to be at least as quiet as the Ohio-class, and Ohios are a hole in the water. You find an Ohio by listening for where the ocean noise isn't.

The pumpjet propulsor is quieter than an unshrouded screw, and going to an all-electric drivetrain allows you to eliminate the reduction gearbox. If you think transmission whine is bad in a car, imagine how noisy it is when you need to turn 65,000hp at 30,000rpm down to hundreds of rpm.

Just those two items will do a huge job quieting the ship.

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