Masthead sheave upgrade

Maintaining, repairing, upgrading, commissioning, decommissioning topics.

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Mvallus
Posts: 15
Joined: Mon Sep 22, 2014 9:40 pm

Masthead sheave upgrade

Post by Mvallus » Sat Feb 10, 2018 6:20 pm

Has anyone upgraded their masthead sheaves from the original delrin (I think) sheave? I ordered the aluminum version from RigRite, but they are much heavier and I really do not want 10X more the weight aloft. This was the closest I could find via Harken: http://www.harken.com/productdetail.asp ... &taxid=396

Original: FM2C Masthead Sheave w/ 12mm ID - Aluminum: NG2-3AB12
http://www.rigrite.com/Spars/Sparcraft_ ... 5_mast.php

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j30_rhapsody
Posts: 194
Joined: Wed Dec 31, 1969 8:00 pm
Location: Newport, RI

Re: Masthead sheave upgrade

Post by j30_rhapsody » Sat Feb 10, 2018 7:29 pm

I replaced mine with black delrin last year. Make sure to use stopper balls on the halyards to prevent shackles from damaging the sheaves.

JohnGreifzu
Posts: 12
Joined: Tue Oct 13, 2015 12:15 pm

Re: Masthead sheave upgrade

Post by JohnGreifzu » Wed Aug 01, 2018 9:18 pm

Are the jib halyard and spin halyard sheaves the same ones? Rig tite part NG2-3B12?

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j30_rhapsody
Posts: 194
Joined: Wed Dec 31, 1969 8:00 pm
Location: Newport, RI

Re: Masthead sheave upgrade

Post by j30_rhapsody » Wed Aug 01, 2018 9:28 pm

John,

I don't think they are. On the class website menu mouse over Info and click on Drawings & Manuals. In the Equipment Manuals section look for the Charleston Spar (Sparcraft) J/109 Mast Manual – 6/10/2009. It has a very good illustrated parts summary.

JohnGreifzu
Posts: 12
Joined: Tue Oct 13, 2015 12:15 pm

Re: Masthead sheave upgrade

Post by JohnGreifzu » Wed Aug 01, 2018 9:42 pm

Figured it all out:

2xNG2-3B12 (spin halyard sheaves)
2xNG1-4 (jib box sheave)

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