Join Date: Feb 2000
Location: Annapolis, Md
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Normally stretch is the controling issue with halyards. It is less so with a spinnaker halyard but it should at least be considered. The bigger issue with spinnaker halyards is chafe, as their lead changes nearly 180 degrees and they tend to be less stable when flying than other sails. Stretch greatly adds to this chafe problem because you have an unfair lead line that is often moving back and forth across an edge, I generally recommend adding chafe gear (a sacrificial cover or stitched on leather) where the halyard passes through the halyard sheeve. I also tie and stitch the tail on my spinnaker halyards so that I can cut them back as they wear.
For the small price difference, I'd probably get the 3/8" parrellel core polyester. That was what I used on my Laser 28.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay