5.7 mast sheaves :: Catamaran Sailboats at TheBeachcats.com

5.7 mast sheaves

rungi

Rank: Mate

Registered: Jun 24, 2021

Last visit: May 25, 2022

Posts: 152
Posted: Oct 14, 2021 - 11:49 AM

Does anybody know where to get the mast sheaves for the nacra 5.7 can be replaced with west marine might carry.
jd91t

Rank: Lubber

Registered: Aug 26, 2020

Last visit: Mar 21, 2022

Posts: 34
Posted: Oct 14, 2021 - 02:07 PM

Murrays.com has em
revintage

Rank: Mate

Registered: Aug 13, 2017

Last visit: Nov 29, 2023

Posts: 280
Posted: Oct 15, 2021 - 07:19 AM

The 5.5 and 5.7 has the same mast except for the lowbudget external halyard and halyard lock of the 5.7.
I suggest you upgrade with the 5.5 top fitting with sheave, hook and ring. I have the top fitting and hook lying around, unfortunately shipping from Sweden might be a problem?

Edited by revintage on Oct 15, 2021 - 01:35 PM.

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Brgds
Lars

Frankentri 5.8/5.5/Inter20
Aerow trimaran foiler

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texastuma

Rank: Mate

Registered: Nov 22, 2012

Last visit: Apr 11, 2024

Posts: 397
Posted: Oct 15, 2021 - 10:16 AM

revintageThe 5.5 and 5.7 has the same mast except for the lowbudget externat halyard and halyard lock of the 5.7.
I suggest you upgrade with the 5.5 top fitting with sheave, hook and ring. I have the top fitting and hook lying around, unfortunately shipping from Sweden might be a problem?
Edited by revintage on Oct 15, 2021 - 07:30 AM.

I mill my own out of delrin. But, I would agree with upgrading to the hook. If the sail is built right and everything lines up, it hooks and unhooks like a dream. Very simple.

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Scott

Prindle Fleet 2
TCDYC

Prindle 18-2 Mod "FrankenKitty"
Tornado Classic "Fast Furniture"
Prindle 19 "Mr. Wiggly"
Nacra 5.8 "De ja vu"
Nacra 5.0
Nacra 5.8
Tornadoes (Reg White)
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leeboweffect

Rank: Mate

Registered: Apr 22, 2015

Last visit: May 21, 2023

Posts: 484
Posted: Oct 21, 2021 - 12:08 PM

rungiDoes anybody know where to get the mast sheaves for the nacra 5.7 can be replaced with west marine might carry.

Here is what came on my 1983 Nacra 5.0 which uses the same mast head setup as the 5.7.

I tried every sheave Murrays and others had, but could not find the correct size. I was just about to have a set custom made, but found out that the 5.0 (an upgraded version) is still made in Australia that uses the correct sheave. I ordered it from:

http://www.nacra.com.au/contact

It looks like this:

The only difference between this new sheave and the old originals is that it is supplied with a spacer to get the ID down to 1/4", the width and outer/inner OD are the same.

Hope this helps.

Enjoy

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Hobie 16 (3 formerly)
MacGregor 25 (formerly)
Chrysler Dagger 14 (formerly)
NACRA 5.0 (currently)
High Point, NC
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