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  #21  
Old 04-25-2012
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Re: Rigid Boom Vang

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Originally Posted by MarkSF View Post
Yes it will drop. But surely you are never supposed to be using the boom to steady yourself?
Why not? In 10 foot or more seas you need to hold on to somthing while at the mast doing sail work.
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  #22  
Old 05-17-2012
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Re: Rigid Boom Vang

Great discussion. I have a topping lift on my Bristol 35.5 and the sailmaker advises a boom vang to improve sail shape. One of the units he mentioned is Hall Spars Quick Vang which for my size boat come in 12:1 or 18:1 purchase. Anyone familiar with this product please chime in as well as which ratio to choose. Thanks
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  #23  
Old 05-17-2012
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Re: Rigid Boom Vang

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Originally Posted by endoit View Post
Great discussion. I have a topping lift on my Bristol 35.5 and the sailmaker advises a boom vang to improve sail shape. One of the units he mentioned is Hall Spars Quick Vang which for my size boat come in 12:1 or 18:1 purchase. Anyone familiar with this product please chime in as well as which ratio to choose. Thanks
The 35.5 and 31.1 are very similar in the rig so these comments should apply to yours.

What I have found is that without the boomvang, the boom has a tendency to lift as the wind increases, and/or as you move off the wind, spilling some air especially at the top of the sail.

This is actually quite a desirable mechanism in SF Bay as it enables the boat to cope with gusts and strong winds nicely.

Applying some vang, especially from close reach to beam reach, is like standing on the gas pedal. The boat heals a lot more, the main develops more power, and the weather helm increases a lot, especially in gusts.

So the upshot is I can see why Bristol thought it OK to leave it off a cruising design. If I was singlehanding, and expecting stronger winds, I'd leave it loose. When I have crew we tend to play the vang sheet, trimming it when wind is <20 knots and easing it out when there's more. Generally it's the weather helm getting unreasonable that will have me telling the crew to ease it out.

Another board member advised having a cam cleat and enough line to reach the wheel, so you can adjust it quickly when you're on your own.

Finally, I think 12:1 is fine for a cruising boat. Not having too much advantage helps to not overstress the boom.

PS, I just brought the boomvang line back to the cockpit, next to the winch for the main halyard. Let me know if you want pics on how to do this. Basically though I used the same blocks as Bristol used for the main halyard, placing them side by side, so it looks like a factory job.
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Last edited by MarkSF; 05-17-2012 at 01:18 PM.
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  #24  
Old 05-17-2012
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Re: Rigid Boom Vang

Mark thanks so much for your reply. I am relatively new to sailing but last fall during the Annapolis sailboat show the wind gusts were in the thirties. The boat had the tendency to round up and spill, a real blast. I can see how a boom vang would prevent this and perhaps that is why the original circa 1978 model did not come with one. As folks started racing it became an add on. If you have pictures I would love to see your arrangement. I see a 31.1 at a local marina and just yesterday we were comenting that her lines are just beautiful.
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Old 05-17-2012
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Re: Rigid Boom Vang

Here's a pic of the Garhauer rigid vang, installed (before I brought the sheet back to the cockpit)



Then a couple of the hardware. The Schaefer blocks haven't changed noticeably. The anodizing on the old cheek block has faded, otherwise they'd look identical.



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  #26  
Old 05-17-2012
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Re: Rigid Boom Vang

Mechanical advantage is good. A 35 foot boat has much large loads than a 31 ft boat. Yes, a vang can break a boom. This usually happens in a hard round down and accidental gybe. Also if the boat is healed and or rolling and you stick the end of the boom in the water you break things. All that said, I wouldn't own any boat without a well functioning vang, and on almost anything over 30', a rigid vang. When you get yours installed, have a friend who's an experienced main trimmer go out with you and show you what it does to/for sail shape. On our boat, it's critical in certain wind ranges even sailing close hauled to the tune of about a knot of boat speed.
Faster and chef2sail like this.
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Re: Rigid Boom Vang

Mark. Thank so much. Great pictures and she looks great. Wood finish is beautifull. My wife wants to know how you finished the teak. Boom vang it will be. New main from UK-Halsey, integral sail cover with lazy jacks, new electronics and off we go. Puddinglegs thanks also.
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  #28  
Old 05-18-2012
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Re: Rigid Boom Vang

Having just learned the hard way. I can tell you the weak link is the boom vang end fittings. Keep in mind with a rigid boomvang pushing up on it, the gooseneck needs to be able to keep the boom from twisting, even when a someone is hanging off the aft end of the boom trying to furl the sail.
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  #29  
Old 05-18-2012
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Re: Rigid Boom Vang

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Originally Posted by endoit View Post
Mark. Thank so much. Great pictures and she looks great. Wood finish is beautifull. My wife wants to know how you finished the teak. Boom vang it will be. New main from UK-Halsey, integral sail cover with lazy jacks, new electronics and off we go. Puddinglegs thanks also.
The teak is done the old-fashioned way - 7 layers of varnish! Since I bought it, I sand lightly once a year and apply a new coat or two. The most important part of the maintenance is that the brightwork is all covered when docked.
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  #30  
Old 05-18-2012
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Re: Rigid Boom Vang

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Originally Posted by talbot View Post
Having just learned the hard way. I can tell you the weak link is the boom vang end fittings. Keep in mind with a rigid boomvang pushing up on it, the gooseneck needs to be able to keep the boom from twisting, even when a someone is hanging off the aft end of the boom trying to furl the sail.
The Garhauer design looks pretty strong. The price includes mounting plates custom-shaped to fit the boom and mast.

I did have a swaged connection on the vang fail on my daysailer. The whole vang assembly shot up into the sky, and sank where it landed.
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