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Old 26-09-2014, 08:37   #1
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Vang Sheeting

Anyone have experience with vang sheeting? How serious is the risk of damaging the boom when releasing the mainsheet with the vang on hard in heavier wind?
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Old 26-09-2014, 08:52   #2
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Re: Vang Sheeting

I've seen booms fold in half ...............
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Old 26-09-2014, 09:02   #3
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Re: Vang Sheeting

Quote:
Originally Posted by Randyonr3 View Post
I've seen booms fold in half ...............
How much wind?
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Old 26-09-2014, 09:22   #4
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Re: Vang Sheeting

Shouldn't the vang rotate with the boom? It does on my boat (hydraulic vang). If you release the main sheet, the boom stays down but swings out. Can't see how it would fold a boom in half, even in heavy wind.


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Old 26-09-2014, 09:39   #5
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Re: Vang Sheeting

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Originally Posted by JazzyO View Post
Shouldn't the vang rotate with the boom? It does on my boat (hydraulic vang). If you release the main sheet, the boom stays down but swings out. Can't see how it would fold a boom in half, even in heavy wind.


Onno
It's the vertical strain not lateral that's the potential problem. Without a vang when you ease the mainsheet the boom rises at the pivot point on the mast (gooseneck).

With a vang on hard when you ease the mainsheet all the upward pressure is transferred to the attachment point of the vang in the middle of the boom.

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Old 26-09-2014, 09:57   #6
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Re: Vang Sheeting

Why would you consider vang sheeting in heavy winds?
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Old 26-09-2014, 10:17   #7
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Re: Vang Sheeting

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Why would you consider vang sheeting in heavy winds?
Just curious. Some boats have very short traveler tracks; some boats have no traveler at all so vang sheeting becomes the most effective way to change the angle of attack without changing the shape of the sail.

Also depends on one's definition of "heavy winds". Is it a risk in 15 or 20 kts of wind or something much higher?

Simpler question is how much is too much vang?
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Old 26-09-2014, 10:28   #8
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Re: Vang Sheeting

If you are talking about using a soft vang to hold the boom out by attaching it to the toerail etc I have done that a lot. It works great but the cautions noted above for heavy winds do apply.... Not sure you need it with heavy winds anyway....
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Old 26-09-2014, 11:22   #9
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Re: Vang Sheeting

I sheet the vang quite some when running. But we are a proper cruising boat and so our boom profile is less likely to snap.

b.
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Old 26-09-2014, 11:38   #10
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Re: Vang Sheeting

It's doubtful that wind pressure alone would be enough force to bend the boom. Think of it as mid boom sheeting. The problem with soft vangs is dipping the boom in the ocean when the boat rolls. That's guaranteed to pretzel almost any boom.

Was afraid to use a hard boom on our boat because the boom is close to the cabin top. The angle of the vang would have put tremendous compression forces on the goose need, 16' long boom with less than 3' on the triangle at the mast base. Went with soft vangs to pad eyes on the deck led back to the cockpit. Have forgotten to release it a couple of times but no big thing. Just released the cam cleat and eased the boom over. Can see that dipping the boom would be possible if it was out all the way. Fortunately the boat is not a roller. Don't let the boom all the way out as the sail chafes against the lower shrouds when it is so the threat of dipping the boom is minimal.
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Old 26-09-2014, 11:52   #11
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Re: Vang Sheeting

Check out this article.

Play your vang around the course By Dave Dellenbaugh

the article does not mention it, but once you transition from pointing to reaching, you may want to ease the tension or strains can get very high
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Old 26-09-2014, 12:46   #12
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Re: Vang Sheeting

You guys are jumping between two topics - vang sheeting and vang easing.

The two are not the same thing. The boom on the J105 snapped because the vang was not eased when the boat bore away and that has nothing to do with vang sheeting.

The vang on every boat should be eased when bearing away whether vang sheeting or not.
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Old 26-09-2014, 12:57   #13
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Re: Vang Sheeting

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Originally Posted by savoir View Post
You guys are jumping between two topics - vang sheeting and vang easing.

The two are not the same thing. The boom on the J105 snapped because the vang was not eased when the boat bore away and that has nothing to do with vang sheeting.

The vang on every boat should be eased when bearing away whether vang sheeting or not.
Understood. So what would be your answer to the OP?
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Old 26-09-2014, 18:41   #14
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Re: Vang Sheeting

Quote:
Originally Posted by OldFrog75 View Post
Understood. So what would be your answer to the OP?
My answers would be:
1. Yes
2. Negligible if done properly

With the proviso that you should only use "vang sheeting" when:
a. you are close hauled and
b. your boat does not have a decent length of traveller.
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Old 30-09-2014, 19:33   #15
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Re: Vang Sheeting

Vang sheeting on a cruising boat? Ah, no, there is no point. Traveler length does not matter in regards to vang sheeting because going upwind the boom should be midline (or near to) anyway. In higher wind the vang on prevents mainsail twist, inducing more heel/leeway/rig load – none helpful to boat speed or comfort.
Fetching and reaching, yes, use the vang to control twist keeping the main powered up (on these angles there is inherently less heel/leeway/rig load). In higher winds some main twist prevents overpowering that causes a tendency for the boat want to round up to windward.
Deep downwind angles use vang to reduce twist to reduce how much the upper main is plastered into the rigging. Also a vang prevents boom lifting that can induce a gybe.
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