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Go Back   SailNet Community > On Board > Gear & Maintenance > What size boom vang
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Thread: What size boom vang Reply to Thread
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Topic Review (Newest First)
04-21-2013 12:28 PM
Faster
Re: What size boom vang

Quote:
Originally Posted by Alex W View Post
Faster: I hadn't thought about that kind of jybe, that's why I come back here and learn more. I can see how a vang would prevent that, but it's pretty secondary to it's normal purpose or learning how to avoid accidental jybes.
True, but such a gybe is almost more likely to occur early in your sailing learning curve rather than later.. something as simple as the vang can prevent that 'unnecessary' occurrence. And it's most likely and most potentially damaging during a DDW - mainsheet fully eased situation.

If a good vang isn't in the budget, a simple fixed strop will perform that function alone...
04-21-2013 12:14 PM
Alex W
Re: What size boom vang

Faster: I hadn't thought about that kind of jybe, that's why I come back here and learn more. I can see how a vang would prevent that, but it's pretty secondary to it's normal purpose or learning how to avoid accidental jybes.
04-20-2013 11:22 AM
Ei Leen Thanks for the advice. Cripe there's so much to learn. I'm taking it all in as fast as I can. There's a huge learning curve just with the terminology :/

Quote:
Originally Posted by Faster:1018947
Quote:
Originally Posted by Ei Leen View Post
I don't think twisting will be a problem since I have a traveler bar across the back
Your traveller is only effective in helping control twist if the boom is still above it. Once you're going downwind and the sheet's let off there's very little downward component to the mainsheet pull. This is where a vang is helpful, it can be used to limit boom lift, provide leech tension and limit/manage twist.

If I had to pick just one, it would be the vang. A powerful easy-to-use vang is like having an infinitely wide traveler.

As an example, look at a competitive Laser dinghy.. a pretty mediocre traveler arrangement, but you'll see a high power vang.
04-20-2013 10:59 AM
Faster
Re: What size boom vang

Quote:
Originally Posted by Ei Leen View Post
I don't think twisting will be a problem since I have a traveler bar across the back
Your traveller is only effective in helping control twist if the boom is still above it. Once you're going downwind and the sheet's let off there's very little downward component to the mainsheet pull. This is where a vang is helpful, it can be used to limit boom lift, provide leech tension and limit/manage twist.

If I had to pick just one, it would be the vang. A powerful easy-to-use vang is like having an infinitely wide traveler.

As an example, look at a competitive Laser dinghy.. a pretty mediocre traveler arrangement, but you'll see a high power vang.
04-20-2013 10:29 AM
Ei Leen Don't think so on the Cunningham or the downhaul
04-20-2013 10:26 AM
Ei Leen I don't think twisting will be a problem since I have a traveler bar across the back
04-20-2013 10:14 AM
Ei Leen
Re: What size boom vang

Quote:
Originally Posted by DonScribner View Post
Check out Ebay. Plenty there in the $80 range. But if you're short on cash, Lowe's sells low cost pulleys that will take enough load for a vang on a 17'' boat. What will you need, 2:1, maybe 3:1? If you're feeling ritzy, I installed a BoomKicker with a 4:1 vang on my Lancer 25. Get's rid of the topping lift. works well.
I've thought about a Boomkicker but a bit pricey for me right now. Thanks for the tip on pulleys, though. I found a groovy plan for a mast raising system and need pulleys for that.
04-20-2013 09:54 AM
Faster
Re: What size boom vang

Quote:
Originally Posted by Alex W View Post
Faster: I haven't thought about the vang as a piece of safety gear during an accidental jybe. How is keeping the boom low during an accidental jybe safer? I don't see it as riskier, I just don't see how it would matter very much.
Alex.. without a vang a 'goosewing gybe' is a possiblilty.. in this case the initially only half the leech gybes and it assumes an 'S' shape (only possible because the boom can lift with no downward pull from the sheet and no vang) This causes the boom to move across on an arc rather than a level 'swing'.. lots more potential energy and violence when the rest of the sail gybes and the boom crashes 'over and down'

Here's a small image of one on a gaff rig..

04-20-2013 09:06 AM
DonScribner
Re: What size boom vang

Check out Ebay. Plenty there in the $80 range. But if you're short on cash, Lowe's sells low cost pulleys that will take enough load for a vang on a 17'' boat. What will you need, 2:1, maybe 3:1? If you're feeling ritzy, I installed a BoomKicker with a 4:1 vang on my Lancer 25. Get's rid of the topping lift. works well.
04-20-2013 08:53 AM
Alex W
Re: What size boom vang

If the topping lift is fixed and tighter than the sail leech then the boom vang won't be able to help flatten the sail. It does sound like a poor topping lift setup.

You will probably find that a cunningham or downhaul (does your boat have either?) will do more to flatten the sail and move the draft forward than the vang.

Faster: I haven't thought about the vang as a piece of safety gear during an accidental jybe. How is keeping the boom low during an accidental jybe safer? I don't see it as riskier, I just don't see how it would matter very much.
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