Josh,
3/8” should be plenty big for your halyards. ½” is certainly overkill. Why not split the difference and go with 7/16”? A slightly larger sheave should create any problems. As strong as halyards are these days, some would argue that 3/8” might be a bit too large. I’m sure your halyard stoppers are driving the decision as well. Going too small can create problems. Jake Jake Brodersen C&C 35 Mk-III “Midnight Mistress” Hampton VA From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Josh Muckley via CnC-List Sent: Monday, January 22, 2018 15:17 To: C&C List <cnc-list@cnc-list.com> Cc: Josh Muckley <muckl...@gmail.com> Subject: Stus-List Masthead sheaves C&C 37+ I have a new problem for the collective wisdom. I'm getting the masthead sheaves re-made by Ed at Zephyrwerks. He made my boom end sheaves 2 years ago and did a great job. I have a 1/2" wide sheave box for 3 sheaves. He cut them with a slight relief and cut the groove for a 1/2" line. I had told him that I simply didn't want to needlessly limit my options in the future despite only using 5/16ths or 3/8ths for the reefing lines. Now 2 years later I'm in a similar situation except the masthead sheave boxes are 5/8ths wide. I can't exactly recall but I believe that I'm running 3/8ths halyards. When I talked to Ed he advised that he would like to cut the groove to match the line which is on the boat. 3/8ths. But also stated that he could cut it however I desired. It seems unnecessarily limiting of my options in the future to cut a 3/8ths groove. It is far easier to run 3/8ths on a 1/2 inch groove than 1/2 inch on a 3/8ths groom. The original sheaves were v-grooves and would accommodate anything from 1/4 inch wire rope up to 1/2 or even 9/16ths line. And we haven't even talked about the added thickness of a core to core eye splice. Anybody want to share their thoughts? Thanks, Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD •••
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