A-Class Mast Halyard Parts

thingiverse

These are mast parts to pull the main sail up the mast on an A-Class catamaran, a light single handed (one person) racing catamaran sailboat. You're supposed to simply push up the sail up the mast or tip the boat and manually wrangle the sail up the mast. But my sail is pretty used and is getting harder to push up as it ages. I'm also getting lazy as I age to have to tip the boat :( So, knowing full well that A-Class design purist will howl at this abomination, I decided to install a main halyard (a rope that pulls up the sail, common in other sailboats). Both parts hold a pulley, one at the top of the mast and the other just above where the boom attaches to the mast. The halyard (rope) goes around each pulley and runs along the sail track. There is enough room in the track for both the halyard and the sail bolt rope. When raising the sail, the halyard end at the top of the mast is tied to the ring at the top of the sail and the end at the bottom is pulled until the ring latches onto the hook. Hooking the ring is still an art, but not as hard as hooking it after pushing up the sail. I knew the design of the parts wouldn't be easy, which is why I attempted it only after designing household stuff. Well, I did have to do those first though to justify the printer :). Anyway, I designed these in Fusion 360. I may have to buy a license after this year as I'm really getting to like it.