Maintenance - Boom end reef sheave

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Boom end reef sheave

Printed From: Laser 28 International Class Association
Category: Laser 28 General
Forum Name: Maintenance
Forum Description: All the things to care for your boat
URL: http://www.laser28.org/forum/forum_posts.asp?TID=770
Printed Date: 05 May 2024 at 8:39pm
Software Version: Web Wiz Forums 11.03 - http://www.webwizforums.com

Topic: Boom end reef sheave

Posted By: Ron Waterson
Subject: Boom end reef sheave
Date Posted: 29 June 2017 at 10:56pm

Does anyone know the specs on the sheaves the reef line runs through aft end of boom? I measured a broken one, but would like to confirm if anyone has the info.

Thanks,

Ron

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Hull 147 - Angel's Share

Replies:

Posted By: Bill Layton
Date Posted: 01 July 2017 at 10:02am

I don't have that info... but I would remove the other one and measure that. In the boom end casting there are 2 plastic sheeves for reefs and one aluminium sheeve for the outhaul. Both reef sheeves are the same dimensions

Posted By: Ron Waterson
Date Posted: 01 July 2017 at 10:23am

I think below will work. I'll confirm and advise when the new ones arrive.

I guess this another routine maintenance thread.....If you haven't looked at your boom sheaves in a while you might want to. They are plastic and exposed to the sun. One of mine was gone, and the other deteriorating. About 12 minutes after a race that we had the main reefed, the reef let go on the leach end of the sail. The sheave was gone and the exposed bolt threads ate the reef line away in short order. Luckily, it was merely a short term inconvenience in my case.

Bore 10mm

Sheave diameter 37mm

Sheave width 13mm

Max line size 10mm

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Hull 147 - Angel's Share

Posted By: frfletch
Date Posted: 01 July 2017 at 11:55am

These seem to measure exactly the same as the ones for the bottom of the mast. I remember because I machined new ones from UHMWPE and pressed in a silicon-bronze bushing except for the spinnaker sheaved for which i used sealed stainless steel ball bearings. All your measurements ring a bell.

Posted By: Ron Waterson
Date Posted: 07 August 2017 at 3:31pm

APS Item SC62031 Schaerfer 1 7/16 sheave - Fit just fine.

Ron

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Hull 147 - Angel's Share