Jib Trim Off the Wind
What to trim
- Trim sheet (adjusts fullness). Let out until just starts to luff and bring in.
- Trim sheeting angle using inboard or outboard lead. This is also going to affect the fullness of the sail. For really light air, lead should be inboard, for medium to heavier air (when you would want a flatter sail shape) lead should go outboard. This works with the sheet to control sheeting angle of the sail.
- Trim for twist. Lead fore/aft position is going to control the tightness of the leech and how much twist appears. Lead forward takes twist out, tightens the leech, opens the foot. Lead aft puts more twist in, opens the leech, tightens the foot.
In heavier air, when a flat sail is required, it needs tension on the sheet to keep it flat, but it needs to be let out for the point of sail. Moving the lead outboard adjusts the sheeting angle so this can happen.
Where to put the lead
When required, lead should be taken as far outboard as possible (usually to a toe-rail). Attach a second sheet to the lead (usually a spare block with shackle and an s-hook for easy attachment.) Cross sheet reaching sheet and use it control upper two-thirds of sail. Between closehauled and about 45 degrees, jib can be controlled with both sheets. The regular jib sheet will control the lower one third of the sail. After 45 degrees or so, the regular jib sheet can be cast off and the jib can be constantly trimmed with the reach sheet from the outboard lead and also by moving the lead forward or aft. Lead will go forward as reach becomes deeper or wind speed increases, eliminating as much twist in the sail as possible. Moving the lead aft opens the leech and put more twist in the sail.