Twisted Boom?

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07mcoupe
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Joined: 3/3/09
Posts: 13
Twisted Boom?

Hi all:

We recently purchased an 1985 Mark I C36, and it seems that our boom is not 100% aligned with our mast.

The track where the sail goes (what's the nautical name for this?) is off and doesn't point straight up, but rather it's off about 10 degrees or so.

This made no difference when sailing, and otherwise the boom looks fine, but it is just a little annoying.

Anyone have any tips on straightening this out? I thought I'd ask here before I go out to the boat with the Tools.

Thanks for all advice!

Eric Silva
1985 C36 Mk I
Loose Change

Abramczyk's picture
Abramczyk
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Joined: 3/31/08
Posts: 17

I'd say first place to look is your boom topping lift might need to be replaced and rerigged, it supports the boom when the main is not raised.

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tgrover
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Joined: 1/5/08
Posts: 131

Hi Eric:

I believe that your boom should rotate at the goosneck as mine does. The eye fitting in the boom end cap should allow this rotation. It could be the stainless steel eye fitting and the cast aluminum end cap have some corrosion that has locked the boom at an angle. I would suggest you remove the boom and then remove the end cap and see where the interference is. Good luck.

Tom & Janis Grover

C36 #0949
SR/WK, M25XP
Midland, ON

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jsc4484
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Joined: 6/29/07
Posts: 138

Eric,
[I] had this problem with my MKI TM also. Last year I had a new main built with a loose foot, according to Catalina ( Frank Butler ) I had metal failure. My boom was not only twisted side too, but also on the verical plane as well. I ended up replacing the entire boom with a Isomat. Larger daimater and thicker walls it ended up weighing about 6 lbs. more than the old boom . But I also had the new gooseneck reworked to fit the mast.

I was told that a spar maker could straighten it out , but the chance of it failing was to great of a chance to take.

Besides if it did fail I'm sure it would hit me and miss the WIFE while she was barking commands "lol"

But as I learned better safe then sorry [/I]

FAIR WINDS & FOLLOWING SEAS

Jeff Costa

S/V KAIROS Hull #0235

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TomSoko
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Joined: 2/15/07
Posts: 978

Eric,
If I understand your question, I agree with Tom. Your boom should rotate along its axis. If not, the large bolt between the end cap and the gooseneck is frozen/corroded in place. With the mainsheet off, you should be able to rotate it completely around. If it is bent, that's anothe problem. It would be easiest to take the boom home to your garage/workbench and work on it. You will probably need PB Blaster, heat, and/or lots of force. Getting the end caps off will be the hardest part. The four self-tapping screws that hold them each in place are a bear if they have never been off. Once you do get them off, I suggest drilling and tapping the four holes in each end for 1/2"x1/4-20 hex head bolts, and install then with never-seize. Under the Articles > Upgrades section of this website is a link to the upgrades on Julandra, and I'm sure there are a couple of pix of that project. Hope this helps.

Tom Sokoloski
C36/375IA Past Commodore
Noank, CT

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