- Category: Boats & Gear
- Created: Monday, 24 August 2015 18:22
- Written by Charles Doane
To function as a proper airfoil a modern Marconi sail must present a curved surface to the wind. To the casual eye a sail may look like a flat two-dimensional piece of cloth, but in fact it has a very specific curved shape built into it. This shape is carefully engineered, depending on what sort of sail it is and how it will be used.
To turn a piece of flat fabric into a curved foil, the fabric must be cut into panels and stitched back together again. By cutting a convex curve along one edge of a panel and stitching it to a straight edge on an adjacent panel, a process is called broadseaming, a unitary curved surface is created once all the panels are joined together. Where the edge of a sail will be attached to a straight spar, as with a mainsail bent onto a mast and boom, shape can also be created by cutting a convex curve along that edge. This is called edge-shaping and is not commonly used these days.Write comment (7 Comments)