Developable-Surface Boats


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  • Pub No.: 7035
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Edson I. Schock/When using sheet plywood for planking, you'll save labor if you plan on this type of hull.

by Edson I. Schock

When using sheet plywood for planking, you’ll save labor if you plan on this type of hull.

If you are planning to build a boat using sheet plywood for planking, your work will be made easier if you select a design having a developable-surface hull. This means a flat or V-bottom hull, with conical or cylindrical bottom and topsides. Either a cone or a cylinder may be developed, or laid out flat, on plywood or sheet metal, and the plank cut from this development put on the boat without twist. Plywood bends fairly easily in one direction only. If you try to bend it in two directions at the same time, it will resent this and resist your efforts. It may even crack. Let us consider what developable-surface boats look like. The simplest form is one having cylindrical surfaces for both sides and bottom, with the elements of the cylinder showing true length in the body plan or sections. Such a boat is shown in Fig. 1.

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