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If the vertical load on the mainsail is 3000 lbs at the boom; the load on the halyard will be nearly the same because it is the only external component on the rig that will carry a vertical load opposing the downward pull. Equal/opposite forces (see Newton's 3'rd law). This is why mainsails tear out from sail slugs when the halyard is not hoisted taught and outhaul not tensioned and the slugs start taking on vertical and horizontal loads.
Last edited by KeelHaulin; 11-19-2009 at 02:12 AM.