How to Layout a Deck Camber - Traditional Boatbuilding Geometry
Howdy folks! Welcome back to Nomad Boat Building. My name is Mark Reuten, and in this episode, we step back into traditional boatbuilding geometry and lay out a deck camber using simple geometric methods. Instead of relying on some form of compass to lay out a chord of a circle I walk through a practical shop-friendly approach using basic tools to create an accurate crown over a given span.
We talk about how deck camber is defined in boat plans, how to translate that into a physical layout, and why this geometric method is often faster and more practical than using a string-and-radius approach—especially in a small shop.
This technique is useful not just for deck beams, but also for making reusable patterns, shaping beam shelves, and ensuring consistent curvature across the entire boat.
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Chapters
00:00 Introduction to deck camber geometry
00:11 What deck camber actually is
00:29 Reference: Chapelle’s Boat Building
01:12 Why traditional knowledge still matters
02:20 Why this method makes more sense over time
03:08 Defining camber (crown vs width)
03:49 Example: 3" crown over 5 ft
04:56 Laying out the baseline
05:44 Establishing perpendicular height
06:15 Creating the camber radius
06:30 Dividing the arc using geometry
07:30 Dividing the baseline
08:17 Connecting points to form the curve
09:56 Using awls to set reference points
10:53 Fairing the curve with a batten
11:48 Why not just use a string radius?
12:30 Making reusable camber patterns
13:09 Applying camber across the boat
13:41 Real-world compromises and fairness
14:05 Final thoughts on geometry in the shop
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