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achieved adjusted aft sails airflow airfoil allow angle apparent wind attached becomes bias boat boom boom vang centreboard clew outhaul cloth crew cross-cut Cunningham curve deck level deflected degree depth of camber developed dinghy jib dinghy sails direction downhaul eased effect fairlead position flatten foot foot length fore and aft foresail forestay forward forward green genoa halyard head headfoil headsail heel height hoisted important increases keelboats knots lateral bend leeward surface load luff tension luff wire mainsail mainsheet mast bend masthead rig maximum naker necessary non-masthead rig Once optimum panels point of sailing pole pressure pull racing rake reach reef relatively restricted rope sail fig sailmaker sailor seams shape sheet fairlead side sideways simple slot spar speed spinnaker spreader Starcut stretch tack and clew tape tell-tales tighten trim twist upper vang vertical warp weave weft yarns whilst winch wind gradient wind strength yacht