Move the lead for better speed
Learning the ins and outs (and fore and aft) of jib leads will help you maximize the performance of your headsail.
The jib lead’s fore and aft movement changes foot depth. A simulation using North Sails’ Flow/Membrane software shows the effect of moving the lead aft, which flattens the bottom of the jib. The simulation at right shows the effect of the lead moving forward, powering up the bottom. In both cases, the change in depth continues up the jib, gradually having less impact until, about halfway up, there’s little noticeable difference.