gooseneck failure (boom to mast connection)

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IaSailor
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gooseneck failure (boom to mast connection)

Post by IaSailor » Mon Sep 12, 2005 10:34 pm

On my newly acquired 1996 Mac 26X I failed the gooseneck on my second sailing trip. :(

I'm confused as to what the parts were originally as some of the pieces were lost. (the 2 pieces I have are a 1 inch length of 1/2 inch shaft with 5/16 holes and a curved piece of bronze about 1 inch by 3/4 inch with a 3/16 hole in it)

The previous owner wrapped the main sail around the boom for storage. I'd like to be able to do this also.

What gooseneck do I buy and where can I get one quickly?

Frank C

Post by Frank C » Mon Sep 12, 2005 11:48 pm

My gooseneck has fractured twice, quickly replaced by a phone call to the factory. In my case it's an aluminum casting that inserts into the front of the boom extrusion, but your furling gooseneck was not a standard, off-the-shelf item.

I do recall reading about a guy who fabricated rotating goosenecks as special order items for around $75 (?), but I never saved that info, since the rigid vang is muvh more important to me than a rotating, furling boom. Hope that helps a little ... 8)

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Neo
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Re: gooseneck failure (boom to mast connection)

Post by Neo » Wed Jan 09, 2019 10:44 pm

If I've said it once I've said it a thousand times I don't understand the way Macgregor designed the Gooseneck.
It's well underrated and the use of a vang puts the quarter inch bolt under a huge amount of stress while the Gooseneck tube swings from side to side slowly cutting it's way through the bolt!!.... So lucky I saw this coming!!...see below. :o

I need to improve on this greatly. Might replace the tube with a solid SS bar and an 8mm SS bolt..... Unless anyone has any other suggestions?

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Don T
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Re: gooseneck failure (boom to mast connection)

Post by Don T » Thu Jan 10, 2019 2:14 pm

Hello,
On my 95 26X the original goose neck was a solid piece of aluminum rod. The short 1/4" bolt they used put threads in the wear area so not surprisingly it cut through the aluminum pretty quickly. I suspect they chose that part to be sacrificial in case of an accidental jibe so as not to take down the rig. I replaced the aluminum with a piece of solid stainless square rod. I chose a longer 1/4 in bolt so the shoulder fit all the way through the bracket and rod then cut off the excess threads. I also took this time to make a new cringle hook to get the threads out of that pivot as well. It's now 22 years later and no notable wear on either piece.

my $.02

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RussMT
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Re: gooseneck failure (boom to mast connection)

Post by RussMT » Thu Jan 10, 2019 3:55 pm

I never gave it much thought, but you are right. That is a poor design.

It works, but is not very durable. I've always thought it seemed weak. But then again, most of the standing rigging seems weak. Many sailors have replace the foresay with a thicker gauge.
I'd love to see what you come up with as a stronger connection.


BTW...OLD THREAD reboot. Just shows how valuable this site is when a 13-year-old thread gets resurrected.
I was thinking "What's wrong with Frank C's profile. Now I know.


--Russ

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Re: gooseneck failure (boom to mast connection)

Post by Ezra_BWY » Thu Jan 10, 2019 4:41 pm

Don has got a good idea with using a longer bolt and cutting off the excess thread. If the threads are not in contact with the gooseneck tube then there should be no "cutting" or excess rubbing from the threads.
Also correct, the gooseneck tube was originally a solid aluminum piece. I believe this changed in 1997. I cannot say for absolute certain why it was replaced with the hollow stainless tube but I suspect that the assertion could be correct, that the stainless bolt was really cutting into the aluminum.

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Neo
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Re:

Post by Neo » Thu Jan 10, 2019 5:51 pm

RussMT wrote:BTW...OLD THREAD reboot. Just shows how valuable this site is when a 13-year-old thread gets resurrected.
I was thinking "What's wrong with Frank C's profile. Now I know.
Yes it came up in a macgregorsailors.com/Google search
I current have the "aluminum casting that inserts into the front of the boom extrusion" so it sounds the same as what Frank C spoke of.
I've found some 16mm SS bar which inserts into the current gooseneck tube and I could weld them together (or I could buy some 20mm Solid bar). But I'm wondering if I should just scrap it all and start again .... Possibly include a rotating Boom (furler) solution at the same time .... Someone here has that but I can't find the thread??

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Re: gooseneck failure (boom to mast connection)

Post by Jimmyt » Fri Jan 11, 2019 8:21 am

http://macgregor26x.com/forum/viewtopic.php?f=9&t=24596

Here's one thread where boom furling was discussed. May not be what you're looking for.

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Neo
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Re: gooseneck failure (boom to mast connection)

Post by Neo » Fri Jan 11, 2019 3:20 pm

Jimmyt wrote:http://macgregor26x.com/forum/viewtopic.php?f=9&t=24596
Here's one thread where boom furling was discussed. May not be what you're looking for.
Thanks but there was another that showed someones fabricated rotating gooseneck. A combination of Metal and Nylon.

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Neo
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Re: gooseneck failure (boom to mast connection)

Post by Neo » Fri Feb 08, 2019 7:43 pm

Ok I considered different designs including rotating boom setup but with limited time decided to just beefed up the existing design. Here's how I did mine...
Firstly I replaced the old tube with a solid 316 SS Bar to spread the load on the bolts. On the mast side I drilled out the bar and mast bracket holes to 8mm which got rid of the 1/4" elongated (worn) holes. I then bought 8mm SS bolts with a blank (non-threaded) section in excess of 27mm and cut off any threaded section not required. And used a spacer (drilled out SS nut in my case) to allow the nyloc nut to tighten up the bolt to the bracket.

Yes and before anyone asks, two years ago I made up a sliding (removable) Gooseneck bracket (I think I posted it up on this forum?).... Which allows me to work on all this stuff in my garage 8) ...

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Re: gooseneck failure (boom to mast connection)

Post by seahouse » Sat Feb 09, 2019 11:40 am

Hi guys. I made a few assemblies that replaced this connection with one made of stainless and UHMW poly which was less sloppy and more robust than the stock one and also allowed the boom to rotate to give the option of rolling the main around the boom. I believe I have in storage (if I can find) the components and material to make another one or two sets. It might be a week or so before I can get there, but will let you know when I do if anyone might be interested.

There might be a thread here somewhere on this, am mobile now but will look later tonight.

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Re: gooseneck failure (boom to mast connection)

Post by Neo » Sat Feb 09, 2019 12:29 pm

seahouse wrote:Hi guys. I made a few assemblies that replaced this connection with one made of stainless and UHMW poly ... It might be a week or so before I can get there, but will let you know when I do if anyone might be interested.
Are yes seahouse it was you that made that rotating gooseneck. I saved some pictures but I can't find the thread now.

Are you just using it for storage? I'd really like to use the boom as crude furler. I was actually thinking of having a rotating fitting at the end of the boom so I could hold the boom up with the toplift and rotate it as I lower the main (into the wind) .... Do you see that working or would it be impractical? ... Would appreciate your thoughts on this. :)

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Re: gooseneck failure (boom to mast connection)

Post by seahouse » Sat Feb 09, 2019 1:12 pm

viewtopic.php?f=7&t=21513&start=75

I don't have the boat any more (all work in progress stopped) and various things are in storage, so am working from memory, this link might give you some info in conversation on it. Somewhere in that thread Mastreb gave a review, both pro and con, of the piece I made. As I recall as far as using it as a furler there was the issue of the boom vang (which can simply be removed to solve it) and the main sheet attachment bale being in the way and needing to be relocated.

I was working on a spiral track to handle the bolt rope on the mainsail which was another barrier to smooth, single-handed operation. Photobucket held some of my photos for ransom so some of the photo links of the pivot might or might not work.

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Re: gooseneck failure (boom to mast connection)

Post by seahouse » Sat Feb 09, 2019 1:25 pm

Neo wrote:
seahouse wrote:Hi guys. I made a few assemblies that replaced this connection with one made of stainless and UHMW poly ... It might be a week or so before I can get there, but will let you know when I do if anyone might be interested.
Are yes seahouse it was you that made that rotating gooseneck. I saved some pictures but I can't find the thread now.

Are you just using it for storage? I'd really like to use the boom as crude furler. I was actually thinking of having a rotating fitting at the end of the boom so I could hold the boom up with the toplift and rotate it as I lower the main (into the wind) .... Do you see that working or would it be impractical? ... Would appreciate your thoughts on this. :)
Yes, I also made a crank with a knob that got hooked onto the end of the topping lift for rolling the boom. But it still took a second person at the mast to make it work. I did not see the problems as insurmountable, but I did not see any solution that was going to be easy to implement on a small scale.

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