Main Halyard Sheave

I recently removed the main halyard sheave from the top of the mast on Revolution, #526. It is aluminum, 6.75" in diameter, .5" thick, and has a 7/8" center hole in it. The hole has a brass or bronze bushing in it which reduces the ID to 5/8".

fit of 3/8" line on original sheave

This sheave has carried a wire rope for 25 years with little apparent wear. I am now changing to an all-rope (3/8") halyard, which the original sheave can handle without machining.

close-up of sheave groove

I also plan to have an extra aluminum sheave made up as a spare, and machined specifically for 3/8" rope. My machine shop will duplicate these at a cost of about $100.00 each. If anyone else is interested, I would be willing to arrange a volume purchase. For reference, I have attached photos of the sheave I removed from my mast.

Cruising the Chesapeake: A Gunkholer's Guide cover Cruising the Chesapeake: A Gunkholer's Guide

My favorite Chesapeake Bay guidebook. While it mentions marinas, it concentrates on anchorages—the kind of places I prefer to spend my time. And in addition to listing shore facilities, it rates each location for Beauty/Interest and Protection. This is the guide you need to really cruise the Chesapeake Bay—a smorgasbord of small creeks and coves.

Amazon Associates logo

Privacy and other policies
page created by George Dinwiddie
copyright © 1995-2017, all rights reserved
Last modified: Wednesday 21-Jul-2004