News for hackers. Stuff that matters.

A comment on Battery-Electric Fishing Vessel Marks a Sea Change for Small Commercial Fishers. Parent comment

Re:Battery-Electric Fishing Vessel Marks a Sea Change for Sm... by pjc50 on Monday September 11, 2023 @04:55AM (#37464608)
This sounds similar to the "sound barrier", except at a different speed due to the different value of rho?
[ Parent | on HN ]
Re:Battery-Electric Fishing Vessel Marks a Sea Change for Sm... by jabl on Monday September 11, 2023 @05:12AM (#37464695)
Sort of, but not really.

The speed of sound in water is 1480 m/s (at 20C), and is independent of the length of the vehicle.

Ships are sort of special because they operate at the surface of the water. Submarines operating submerged have no such "hull speed", and their wave-making resistance is insignificant.

[ Parent | on HN ]