A main halyard should have a low elongation. This is required for properly trimming your sail: when the wind increases, you want your main sail to stay flat. For Dinghy regatta we recommend the ropes below.
Suggested length, here Suggested diameter, click here
This is an high-performance regatta rope and has a core of coated Stirotex fibers. The Technora/polyester cover is suitable for big winches and works very well in clutches. This rope is suitable for splicing and tapering.