Main Halyard Specs. From Jeff.

The Melges main halyard in 492's mast is 5/16 inch diameter Vectran. The line has no cover except for the last two feet at the top where it goes through the sheave and ties to the headboard. The other end has a spliced eye that the halyard tail and the purchase system with cleat can both connect to. The length from the end of the splice loop to the end of the halyard is 9.9 meters. The halyard tail would want to be 11 meters long of 3/16 diameter standard type Dacron line as this line only pulls the sail up and does not take any load once the adjustment system is connected.