Cunningham and boom vang set-up? - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 03-27-2012
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Cunningham and boom vang set-up?

My boat has a 4:1 vang set-up from the boom to an eye in the sail track. It is secured in the sail track with two non-ss screws. I am concerned that the screws are starting to deteriorate, but I am afraid to try to back them out since they will likely twist off. Or, they are secured internally by nuts which would fall into the mast and would be there for another season.

The mast is on a sturdy ss plate with many holes on the four flanges. I am planning to use this plate to rig blocks to lead the halyards aft through a deck organizer in the future. Would it be better to mount the vang to the plate as well?

I also want to rig a cunningham. I was thinking a 4:1 system? Too much purchase? What are the recommendations on this?
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Old 03-27-2012
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Re: Cunningham and boom vang set-up?

If your mast base plate (deck stepped, I assume??) is strong enough it may well be a better place for the vang connection. Do try to keep the pivot point of the lower block on the same axis as the gooesneck if you can. Keep in mind the vang gets some heavy loads on it in a breeze downwind. 4:1 is a bit marginal but may be enough if you're just cruising. It's easy to double it, though, with a single block and a part back to the base. Here's an image from the Harken catalogue.



You could do a similar thing with the cunningham, use a 4 part tackle but take a lead off the top block, up through the cringle and back down to the gooseneck. For less friction a block with a hook could be used at the cringle instead of dragging through the eye in the sail.

Using a more powerful tackle allows use of smaller line, and better ease of adjustment meaning you'll use it more often.
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Old 03-27-2012
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Re: Cunningham and boom vang set-up?

I think the mast plate would be a much better place to attached your vang. Info on what boat would be helpful.

Again not knowing how big your main is but for my Cunningham on a 30 foot boat with a big main I have I believe three to one.

I just tried to describe how I set it up but my memory fails me again
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Old 03-27-2012
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Re: Cunningham and boom vang set-up?

Faster: Yep, it is deck stepped. I could easily double the purchase by moving it to the base plate and running the line through an extra block at the boom as you show in the diagram, thanks. I just replaced the line with a new 3/8" Sta-set and bought enough to still give me enough to run to the cockpit later I think.

I will look at setting up the cunningham like you described as well.

Gary: The boat is a Pearson 27. Sorry, I put that in the signature not the body. Here is the best picture I have at the moment of the set-up. (Pardon the sail trim; the luff is saggy in the pic and winds were light and variable that day. We had just raised the main and fixed the trim later.)
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Cunningham and boom vang set-up?-img_1658.jpg  
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Old 03-30-2012
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Re: Cunningham and boom vang set-up?

You have an eye bolted inside the sail track?

Like this:
My mast has a crack in its butt - Sailing Anarchy Forums

I suggest changing it.
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