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-   -   Slideing gooseneck vs cunningham (http://www.sailnet.com/forums/gear-maintenance/55435-slideing-gooseneck-vs-cunningham.html)

jarcher 06-17-2009 08:21 PM

Slideing gooseneck vs cunningham
 
Hi All...

I bought my boat last September and am still figuring out how the PO had it set up. I am trying to modify the rigging for maximum advantage in racing.

Currently, my boat has a track on the mast and a gooseneck that slides (not very well at all - it binds) up and down along this track. From the bottom of the gooseneck there is a very thin and short line that just dangles there with nothing to attach to. The main sail is equipped with a cringle for a cunningham, but no cunningham I can locate.

I am trying to decide how best to fix this. I have at least two options:

1 - Replace both the gooseneck and track with a system that allows the gooseneck to snap into place along the track, locking it in place, and rig a conventional cunningham (with a purchase) through the cringle.

2 - Keep the existing track and gooseneck (or maybe find a gooseneck that does not bind on the track) and run a 2:1 or maybe 3:1 purchase from the bottom of the gooseneck down.

The mast is deck stepped.

Setting aside the fact that the existing gooseneck tends to hang up on the slide, does it make a difference whether I tighten the luff from below at the gooseneck itself or at the cringle?

Snaping the gooseneck into place and using the cringle would create a small area of sail disruption at the tack, but not move the height of the boom.

Having the gooseneck slide avoids a bag in the sail at the tack, but then the height of the boom changes. I am not sure there is a disadvantage to that and I am leaning toward this system.

Either way, I need to mount the bottom of the down haul / cunningham somewhere, so the other concern is mounting something that creates vertical stress to the cabin top. This is a problem with whichever system I pick, so I would appreciate comments about that as well. Is it a valid concern?

Of course either way, I can bring it aft to the cockpit. I may or may not, as the cockpit is extremely small.

Thanks very much for any suggestions! I plan to do this over thr weekend. Got a nice race Saturday!

lshick 06-17-2009 09:11 PM

Consider that the gooseneck is one of the most heavily-loaded bits of moving equipment on your boat. Any choices you make should be made in the direction of stronger.

Wayne25 06-17-2009 09:22 PM

I have a sliding gooseneck on my Helms 25. The downhaul line is secured at the base of the mast in the same mast slide, not the deck.

sailingdog 06-17-2009 09:22 PM

I would suggest affixing the gooseneck to the mast in a set location and then setting up a proper cunningham. If you mount the cunningham or downhaul hardpoint to the mast step, there will be no effect on the cabintop.

Having a fixed height boom makes it easier to setup and use a boom vang. It also makes it less problematic if you decide to run the halyards and other control lines aft, since some lines, like the outhaul and reefing lines, would be affected when the boom changes height.

jarcher 06-17-2009 09:26 PM

Quote:

Originally Posted by sailingdog (Post 497585)
I would suggest affixing the gooseneck to the mast in a set location and then setting up a proper cunningham. If you mount the cunningham or downhaul hardpoint to the mast step, there will be no effect on the cabintop.

Makes sense, but the mast step is completely covered by the mast itself. Should I add some kind of ring or bail to the actual mast?

Wayne25 06-17-2009 09:35 PM

Can you attach a fixed jam type cleat to the base of the gooseneck track? Or if your using blocks for mechanical advantage, a ring fitting. I guess we should ask what type of slide do you have. There are many different types of cars made for slides that will solve your problem.

sailingdog 06-17-2009 09:52 PM

They make plates that can fit on the mast step for just this sort of purpose.

http://www.blumhorst.com/potterpages...ate_medium.jpg

Quote:

Originally Posted by jarcher (Post 497587)
Makes sense, but the mast step is completely covered by the mast itself. Should I add some kind of ring or bail to the actual mast?


jarcher 06-17-2009 10:30 PM

Quote:

Originally Posted by Wayne25 (Post 497590)
Can you attach a fixed jam type cleat to the base of the gooseneck track? Or if your using blocks for mechanical advantage, a ring fitting. I guess we should ask what type of slide do you have. There are many different types of cars made for slides that will solve your problem.

Well the track is a Tee track, similar to what a genny car rides on. It does not extend down very far below where the goose neck usually sits. Someone else suggested the track, maybe I can find a ring that would slide in the track.

What did you mean by a car could solve the issue?

SD, I have never seen an unstepped macs, so forgiv this dumb question, but does the mast somehow sit on that plate? The impression I had is that the mast step is like a shoe that sticks up, and the mast site on top of it, and the step comes up into the mast a bit to prevent it from sliding around on the deck. But I could be wrong, as I have never seen how it works.

sailingdog 06-17-2009 11:10 PM

Depends on the boat. But many have a mast step that is essentially a plate that the mast sits on. For instance, this is the mast step on my boat.

http://www.adriftatsea.com/files/Spring08a.png

It is basically a three-sided box that the mast slides into. It has plates attached so I can use blocks to lead lines aft, and has two holes for safety pins that prevent the mast base from moving forwards.


On a lot of boats, you could mount that plate where the mast sits on the cabintop by loosening the shrouds and stays a couple turns...since it is only 1/16" thick or so.

Quote:

Originally Posted by jarcher (Post 497599)
SD, I have never seen an unstepped macs, so forgiv this dumb question, but does the mast somehow sit on that plate? The impression I had is that the mast step is like a shoe that sticks up, and the mast site on top of it, and the step comes up into the mast a bit to prevent it from sliding around on the deck. But I could be wrong, as I have never seen how it works.


pvanv1 06-18-2009 07:04 AM

I have a sliding gooseneck on my HR28. That was part-and-parcel with the old-school roller booms of the 60's. Wouldn't replace it like that today, but since it's existing gear, we use it.

We don't use the roller function, but the sliding gooseneck with downhaul is a good thing -- to allow our Dutchman to be tensioned at rest, yet relaxed when the sail is hoisted. We release the vang and downhaul, hoist fully, and then tension the downhaul to adjust luff tension, just like a cunningham.

FWIW, We do run McLube on the gooseneck track, as it isn't as low-friction as it could be.


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