![]() ![]() Generally, sailmakers take their cue from the boats J dimension to determine this. The foot dimension speaks to the overall breadth of the sail. That will give the sail a relatively flat luff for tighter sailing angles, but also preserve some latitude for the user so that he could ease the tack line and develop a slightly fuller shape for sailing somewhat deeper angles. For a flat, tight reaching sail, like UK Sailmakers’ Code 0, North’s G Zero, Quantum’s Code Zero, or Doyle’s UPS (a generic equivalent is shaded in blue in the image above), a sailmaker would likely start by prescribing the A-sails luff to be anywhere from 90 percent to 100 percent of the distance from the stem to the spinnaker halyard exit box on the mast. In general, close reaching sails are smaller and flatter, and sails meant for broad reaching and running are larger and deeper. In designing an asymmetrical cruising spinnaker, most sailmakers begin with the boats fore-triangle rig dimensions (I and J), and combine those with information about the intended use of the sail (tight reaching, reaching, or running) and information regarding where the sail will be used. Here’s a brief summary of the design parameters that a sailmaker will consider when designing a custom light air headsail for your boat. Whether you want a sail strictly for downwind running, for close-reaching in light winds, or one that you can carry while reaching through a wide range of apparent wind angles, every major sailmaker will be able to custom design a sail that fits your general needs. Prior to that report, at the the height of the cruising code-zero craze, PS surveyed sailmakers to find out their views on light air sail design, materials and construction. ![]() In a two-part series on light air furlers, we reviewed several furling systems designed to handle these sails. In response, sailmakers have turned to the power of computer assisted design (CAD) to develop custom light air sails that can keep us sailing faster in summer zephyrs.įor cruising sailors, the light-air furling code-zero has made it easy to keep moving when the winds go light. No sailor likes to switch on the motor if they don’t have to, but the northern hemisphere summer brings fickle light winds to some of the world’s most beautiful cruising areas. ![]()
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