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 coryrc on Sunday September 10, 2023 @05:57PM (#37460504)
And, a planing hull is not a great shape for displacement. I think they have significantly more drag, just 2x or 3x though, when operating at displacement speeds.
[ Parent | on HN ]
Re:Battery-Electric Fishing Vessel Marks a Sea Change for Sm... by coryrc on Wednesday September 13, 2023 @02:51PM (#37500199)
If anyone's confused about 10x in the GP post and 2-3x in this one, a given size boat with a displacement hull might have a hull speed of 6 kts and with a planing hull a hull speed of 5 kts.

At 2 kts, they'd both probably be in displacement, but the planing hull would be using 2-3x power.

At 6 kts, the planing hull would be using about 10x power, because it would be operating in planing mode while the displacement hull is still operating in the very efficient displacement mode.

Only the planing hull could exceed 6 kts.

[ Parent | on HN ]