Eli5: How do water lines on a boat work?

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I’ve been watching a lot of boat building videos on YouTube but I never got the concept of water lines.

I get that you can draw a horizontal line across the hull but how do you determine that it will be the waterline? Is it just a rough estimate based on Archimedes or is there some other witch craft going on?

In: Engineering

4 Answers

Anonymous 0 Comments

Anytime I put new bottom paint on a boat thus creating a water line I’ll have the boat in the water to determine its natural line. The boat will always sit at a certain point at rest due to buoyancy. Then when I remove the boat I just trace that around the boat as even as I can and go from there. Usually if you leave a boat in for a week it will give you a good “scum” line around the boat to follow. Hope that helps.

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