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Old 19-01-2016, 12:19   #16
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Re: What is this metal rod for?

Clearly a tie rod to deflect mast compression.

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Old 19-01-2016, 12:27   #17
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Re: What is this metal rod for?

GI,

Ours has a rather large diameter termination bedded on the deck, no eye. A couple of years ago, we had the mast step rebuilt at the original builder's current shop.

Original running rigging involved a winch farm scattered on deck around the mast for halyard work. Foot blocks were deck mounted with backing plates. The principal involved with the original build/design stated the original intent of the tie rod was to react the halyard foot block loads, hold the deck down.

Subsequently, issues with knees and shroud loads and under sized athwartship scantlings , IMO, at the mast step, the tie rod was counted on to react some of the mast loads at the keel.

In your photos, it appears all your halyard loads are kept on the mast, no foot blocks. So the only loads your tie rod would see would be the shroud loads trying to "make the boat skinny".

There is a small measurable variation in the deck position relative to the mast when transitioning from resting on keel on the hard and afloat. In our case the tie rod does something. I always check for slack in the tie rod and remove prior to launch, turnbuckle adjustment.

Your results may vary!!

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Old 19-01-2016, 12:36   #18
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Re: What is this metal rod for?

I have a pad eye that the tie rod goes through with a nut and three additional through bolted screws. I use a snap shackle and a four part purchase to a boom bail for vang and clip to toerail for preventer...very common...
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Old 19-01-2016, 12:48   #19
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Re: What is this metal rod for?

With the mast on the keel, (rather than on deck with a support post) as the rig takes stresses, pulling the sides of the boat inward, it wants to bulge the cabin top up. That rod keeps the cabin top fixed. Strengthening the system
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Old 19-01-2016, 12:48   #20
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Re: What is this metal rod for?

Quote:
Originally Posted by GoneIsland View Post
Hello all, I'm perplexed on what the heck this thing is for. I've tried google searches and asking everyone I come across. I'm in the middle of a headliner rebuild and leak hunt on this 1979 Endeavour 37, A plan. It was leaking but I fixed that, now I'm just wondering if I should keep it or take it out and epoxy the hole closed. Someone put time, effort and money to install this but I can't seem to find a use for it.
Thank you
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John,

I learned years ago not to alter/remove something because I [nor anyone I asked...] didn't know its function; and Re-engineering through unqualified consensus is asking for trouble... There is always a reason, and I have kicked myself more than once before learning this lesson...

Answering your question, it is most likely a Deck Tie Down. The purpose is to keep the deck from pulling up if you had blocks at the mast base to assist with halyard, etc. lines being led elsewhere [e.g., most commonly aft...] or if the hull tends to compress- lifting the deck.

It is possible it serves another purpose, but I suspect this is most likely- especially since it appears to have an eye on top. [for attaching a block?]

If you haven't already, you might search out an online owner's group for your boat if the manufacturer isn't still around and see what you can glean from there.

In case this is helpful.

Cheers!

Bill
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Old 19-01-2016, 12:52   #21
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Re: What is this metal rod for?

Valiant 50 has one to, I thought it was for grabbing down below in heavy seas ..... of course at time we were doing a 1400 mile delivery up the coast.
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Old 19-01-2016, 12:59   #22
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Re: What is this metal rod for?

Mast tie rod adjustment/limber hole in mast


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Old 19-01-2016, 14:02   #23
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Re: What is this metal rod for?

Cheechako got it correct.

On a keel stepped mast the upward forces on the side stays and the shape of a typical deck house will cause the top to bulge upward (forces want to pull the sides inward). Remember your old bow and arrow. Fiberglass is very flexible and steel/ aluminum not so much. The rod takes that force. Some designs use a pin through the mast and mast collar.
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Old 19-01-2016, 16:24   #24
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Re: What is this metal rod for?

Btw.the eye on deck might be to attach a halyard block or the like.
Possibly retrofitted.
Not good to pull on it other than vertical, as this might bring the tie rod out of alignment otherwise.
Don't think it's clever to attach a turning block towards a winch here unless you make sure it cannot be pulled sideways.

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Old 19-01-2016, 17:34   #25
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Re: What is this metal rod for?

Quote:
Originally Posted by donradcliffe View Post
Its to keep the halyards from lifting the deck up.
DON - You win the prize! Every boat I have ever sailed has one. Think about the massive up-force applied to the deck when cockpit halyards turn up. THe blocks are always bedded in to the deck. The puts the resultant down forces at the top of the mast; transferred to the mast step and back to the halyard blocks.

YES - YOU DO NEED IT
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Old 19-01-2016, 18:34   #26
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Re: What is this metal rod for?

Quote:
Originally Posted by donradcliffe View Post
Its to keep the halyards from lifting the deck up.
Correct
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Old 19-01-2016, 21:45   #27
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Re: What is this metal rod for?

Thank you all to your replies! I figured that I'd find the answer here, y'all have been a wonderful resource while doing this refit. It's been a hard yet rewarding journey so far. Thanks again!
John

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Old 20-01-2016, 09:16   #28
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Re: What is this metal rod for?

Stops the deck distorting upwards. The halliards pull the mast down and the shrouds then try to pull the hull inwards towards the centre. The only way the deck can go is up and that is what this rod prevents. Loose it off and you will soon find things start to creak and leak....
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Old 20-01-2016, 09:40   #29
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Re: What is this metal rod for?

Which reinforces the notion that deck stepped masts are the way to go. Otherwise, your mast will want to push your hull down and the deck up. In a violent situation can actually rip your deck away from the hull. How cool is that? Deck stepped keeps everything in compression so the deck wants to keep hugging the hull.
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Old 20-01-2016, 09:50   #30
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Re: What is this metal rod for?

It is also called an anti-panting rod. I learned that BEFORE the standing rigging is tightened, this rod should be fixed to the keel step and the aperture in the deck that the mast passes through. I was told that the adjusting nut only need be "hand-tightened". When the standing rigging is adjusted, the anti-panting rod will "in theory" keep the deck from rising due to the contractive forces of the stays.

I wouldn't remove it or not use it without correct adjustment.
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