The Bill's Spider Mainsail panels change direction at four horizontal junctions for precise alignment. These panels are oriented to fan from the head and the clew following the load path through the leech.

The luff of the sail allows controlled stretch for draft adjustment. Kevlar content is reduced as loads decrease in the forward and center sections of the sail. By saving weight in the non-load-bearing areas of the cloth, chafe-resistant taffetas can be added to key sections. As a result, the Spider Mainsail has increased durability while being lighter than the industry average mainsail weight.

Bill's Spider Mainsail design maximizes the efficiency of your rig. The sail is constructed with minimum luff curve to push the roach to the absolute limits of the applicable racing rule for increased projected area. Cored, tapered battens are used for to reduce weight. The specific flex characteristics of each batten match the sail shape. Rugged, sophisticated and streamlined batten pocket construction allows incremental tension control with fail-safe batten closure.

Bill recognizes the importance of building a genoa that holds its shape while wind and wave conditions change. Our proven computer shapes, combined with the strength characteristics of high-quality fabrics, ensure superior performance across the widest possible wind speeds.

Bill's Spider Headsails attain minimum weight by tapering the Kevlar content in the center of the sail, where loads decrease. This effect actually flattens the sail as the loads along the foot and leech increase with sheet tension. When designing your Spider Headsail, we pay strict attention to maximum area. The leech is engineered to give a consistent slot, compressing the airflow evenly along the leeward surface of the mainsail. This minimizes backwinding and produces the cleanest exit of airflow. The result is tighter sheeting on a narrower sheeting base which allows higher pointing with speed.

Bill's Spider Blade Jib designs fill the foretriangle as completely as the rig will allow. Blade Jibs are constructed with shaped panels because the wind range required for Blade Jibs is smaller. This locks the draft forward and opens the leech, an essential shape for performance in upper wind ranges.

Bill employs the most sophisticated computer-molded spinnaker design system in the industry, allowing each panel to be shaped separately. These molded panels fit together without distorting the lightweight spinnaker fabric. The result is the most efficient sail for maximum offwind speed. Breakthrough shapes are engineered for performance spinnakers in any size range, from runners for the Grand Prix Maxi circuit to world champion all-purpose J 24 spinnakers.