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Headsail luff trim
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adjustment aerodynamic aerofoil allow aloft angle of attack apparent wind balance batten bias stretch boat boom broadseaming cap shrouds centre centreline chord ratio circular flow cloth corners creases cringle cruising chute Cunningham Dacron deck degree depth of camber depth-to-chord ratio downwind drag duced effect efficient fabric fairlead fill yarns flatten foil foot force fore and aft foresail forestay forward fractional rig genoa halyard head and clew headsail hoisted increase keel Kevlar laminate leading edge leech leeward surface lift load loft floor low pressure lower shrouds luff mainsail mainsheet mast bend maximum camber moving naker North Sails nylon panels Photo pole position reduced reefing roach sail designer sail shape sailcloth sailmaker sailor seam sheet lead sheeting angle side slot spar spinnaker spreader stagnation point tack tape tell-tales tion trim twist upper vertical ward warp yarns weave Whilst windward woven yacht