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by samwillis
1074 days ago
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On this: > Instead, the battle of submarine silence has mostly revolved around obscure technical problems of fluid dynamics, since one of the loudest noises made by submarines is the cavitation around the screw. I don't know if this is true today, but at least years ago the low-noise design of the screw on modern US submarines was classified, and so the screw was covered by a sheath whenever a submarine was out of the water. I wander if they are Toroidal or "tipless" propellers? They create less turbulence and cavitation. https://en.m.wikipedia.org/wiki/Toroidal_propeller Previous posts on HN: > Toroidal propellers turn your drones and boats into noiseless machines https://news.ycombinator.com/item?id=34571282 > Sharrow MX-1: Tipless propeller https://news.ycombinator.com/item?id=33949895 |
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