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Build a Surfboard Episode 1: Shaping

Step 10Shape the Bottom Concave

Shape the Bottom Concave
Johnny cuts down the middle of the board to give it "concave". Here he checks the initial cuts that define the maximum depth. He wants it to be 1/4" deep. Then he planes the rest of the concave. He prefers the "Reverse Vee" style of concave with flat sides instead of the more common rounded concave.
He says "The vee gives you less of a hook here at the rails, and makes the rails less grabby."
He carves another reverse vee concave in the front of the board. The concaves blend into areas with no concave at the tail and in at the front of the board, about 1/4 of the way from the tip.
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Author:TimAnderson
Tim Anderson is the author of the "Heirloom Technology" column in Make Magazine. He is co-founder of www.zcorp.com, manufacturers of "3D Printer" output devices. His detailed drawings of traditional ...
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