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Catalina/Capri 25/250 Sailor's Forums

Catalina 25 Specific Forum

Boom vang line diameter

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OJ
Master Marine Consultant

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USA
4382 Posts

Initially Posted - 07/17/2013 : 08:19:16

Time to bring the boom vang line back to the cockpit.

The Catalina parts manual shows 1/4". That seems light, I'm thinking 5/16".

Thoughts?

1989 C25 TR/WK, #5822
1973 McVay Minuet 19
1975 Jester 12
1981 C25 SR/SK, #2428
1981 C22 SR/SK,
Tanzer 16
Sunfish

"There is nothing, absolutely nothing half so much worth doing as simply messing about in boats." Kenneth Grahame

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Davy J
Master Marine Consultant

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USA
1511 Posts

Response Posted - 07/17/2013 : 09:56:54

My boom vang is 3/8", but when it needs replaced I will just use 5/16". Should be more than enough.

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Steve Milby
Past Commodore

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USA
5902 Posts

Response Posted - 07/17/2013 : 10:06:34

My vang was 1/4" and lasted 23 years without replacement, and I raced her vigorously. Vangs were rigged with 1/4" line on several thousand C25s since about 1977, and I have never heard of a single 1/4" vang line failure since I have been sailing C25s (about 1980). You can, of course, rig your boat as you wish, but generally, increasing line size is unnecessary, and the oversized lines don't run as freely through the blocks as the recommended size line.

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ftworthsailor
Captain

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USA
279 Posts

Response Posted - 07/17/2013 : 10:14:35

My Boom Vang uses a 3/8" line. I use larger line 7/16" for my halyard and sheets because I have difficulty holding lighter lines and prefer the thicker line.

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awetmore
Master Marine Consultant

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USA
1144 Posts

Response Posted - 07/17/2013 : 10:51:58

1/4" is more than strong enough. The vang is splitting it's load over 4 lengths of line, so the load on the line is pretty low.

It's not that easy to yank on though, so I used 3/8".

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OJ
Master Marine Consultant

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USA
4382 Posts

Response Posted - 07/17/2013 : 10:54:11

I agree, 1/4" has adequate strength, I'm thinking from the hand comfort point of view. I didn't mention that I will be running this through a rope clutch . . . so the line has to be large enough for the clutch to <i>grab</i> it. Thanks for the replies.

Edited by - OJ on 07/17/2013 10:55:13

awetmore
Master Marine Consultant

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USA
1144 Posts

Response Posted - 07/26/2013 : 07:39:00

Rope clutches are sized for a target line size range, and generally have the highest holding power on the largest line that fits. So then I'd pick what best fits your clutch.

I like the Lewmar clutches and use the 8-10mm ones for halyards and 6-8mm ones for secondary control lines. My vang is 3/8" and shares a 8-10mm clutch with the main halyard. This is on a little bigger boat than the C-25 though.

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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.